Ultraviolet light intensity detector convenient for wireless data acquisition

Abstract

The utility model provides an ultraviolet light intensity detector convenient for wireless data acquisition, and relates to the field of photocuring 3D printing. A photosensitive hole is formed in the main shell; an ultraviolet light intensity acquisition unit, a core operation unit and a wireless communication unit are arranged in the main shell; the ultraviolet light intensity acquisition unit is used for acquiring external ultraviolet light penetrating through the photosensitive hole; the core operation unit is respectively connected with the ultraviolet light intensity acquisition unit and the wireless communication unit and is used for processing light intensity data of external ultraviolet light acquired by the ultraviolet light intensity acquisition unit and transmitting the light intensity data to an upper computer through the wireless communication unit; the core arithmetic unit is equipped with automatic calibration and calibration functions. According to the utility model, the calibration efficiency is improved and the operation error is reduced.

Description

Technical Field

[0001] The utility model relates to the field of photocuring 3D printing, in particular to an ultraviolet light intensity detector which is convenient for wireless data collection. Background Art

[0002] Stereolithography 3D printing is a rapid prototyping technology that uses ultraviolet light to cure photosensitive resin layer by layer to build complex three-dimensional structures. In this process, it is crucial to ensure the accuracy and intensity of ultraviolet radiation, because it directly affects the printing quality and performance of the final product. However, current stereolithography 3D printers generally have inconsistent light source intensity, and the intensity of the light source changes as the light source ages. The change in light source intensity has a direct impact on the curing speed and printing accuracy of the material. Too high or too low radiation intensity may lead to a decrease in printing quality and even affect the performance of the printed material. Therefore, it is necessary to frequently calibrate the printer light source during actual use.

[0003] At present, the calibration of light sources in the field of light-curing 3D printers has the following problems:

[0004] The entire process requires staff to participate in collecting readings and then manually input the data into the 3D printer for light source calibration. The entire process is cumbersome and inefficient.

[0005] Moreover, manual operation is prone to operational errors caused by human factors, which may lead to unexpected errors. Utility Model Content

[0006] The utility model aims to provide an ultraviolet light intensity detector which is convenient for wireless data collection, so as to solve the problems of complicated and inefficient calibration process and large error in manual operation.

[0007] To achieve the above purpose, the utility model provides the following solutions:

[0008] An ultraviolet light intensity detector convenient for wireless data collection comprises: a main housing;

[0009] A photosensitive hole is left on the main shell; the interior of the main shell includes an ultraviolet light intensity collection unit, a core computing unit and a wireless communication unit;

[0010] The ultraviolet light intensity collection unit is used to collect external ultraviolet light passing through the photosensitive hole;

[0011] The core computing unit is connected to the ultraviolet light intensity collection unit and the wireless communication unit respectively, and is used to process the intensity data of external ultraviolet light collected by the ultraviolet light intensity collection unit and transmit it to the host computer through the wireless communication unit; the core computing unit is equipped with automatic calibration and calibration functions.

[0012] Optionally, the ultraviolet light intensity collection unit is a gallium nitride-based photosensor;

[0013] The gallium nitride-based photosensor is used to collect light intensity data of external ultraviolet light and convert the light intensity data into a calibrable and quantifiable voltage signal.

[0014] Optionally, the ultraviolet light intensity collection unit specifically includes:

[0015] The second pin of the photodiode SD1 is connected to the GND line; the first pin is connected to the fourth pin of the operational amplifier U7;

[0016] The first pin of the operational amplifier U7 is connected to the first pin of the resistor R18 and the first pin of the resistor R19; the second pin and the third pin are connected to the GND line, and the fifth pin is connected to the VCC line;

[0017] The VCC line is connected to the GND line through capacitor C20; the second pin of resistor R18 is connected to the LIGHT_SENSOR1 line;

[0018] The second pin of the resistor R19 is connected to the first pin of the photodiode SD1; a capacitor C27 is connected between the first pin and the second pin;

[0019] The LIGHT_SENSOR1 line passes through capacitor C28 and diode TVS6 to the GND line.

[0020] Optionally, the core computing unit specifically includes:

[0021] The 4th and 6th pins of the core computing chip U6 are connected to the VCC line; the 7th pin is connected to the GND line; the 8th pin is connected to the 3rd pin of the active crystal oscillator Y2; the 10th pin is connected to the 1st pin of the resistor R13 and the 1st pin of the capacitor C25; the 13th pin and the 14th pin are connected to the UART2TX line and the UART2RX line respectively; the 16th pin is connected to the LIGHT_SENSOR1 line; the 20th pin is connected to the BAT_CHK line; the 21st pin is connected to the KEY1 line; the 22nd pin is connected to the CHK_USB line; the 23rd pin is connected to the PWR_ONOFF line; the 29th pin is connected to the UART1TX line; the 32nd pin is connected to the UART1RX line; the 47th pin is connected to the I2C1SCL line; the 48th pin is connected to the I2C1SDA line;

[0022] The VCC line is connected to the GND line through capacitors C21, C22, C23 and C24;

[0023] The second pin of resistor R13 is connected to the VCC line;

[0024] The second pin of capacitor C25 is connected to the GND line;

[0025] The first pin of the active crystal oscillator Y2 is connected to the first pin of the resistor R12; the second pin is connected to the GND line; the third pin is connected to the eighth pin of the core computing chip U6; the fourth pin of the active crystal oscillator Y2 is connected to the VCC line;

[0026] The first pin of resistor R16 is connected to the VCC line; the second pin is connected to the I2C1SDA line;

[0027] The first pin of resistor R17 is connected to the VCC line; the second pin is connected to the I2C1SCL line;

[0028] The first pin of resistor R15 is connected to the VCC line; the second pin is connected to the UART1RX line;

[0029] The first pin of the resistor R14 is connected to the VCC line; the second pin is connected to the UART2RX line.

[0030] Optionally, the wireless communication unit specifically includes:

[0031] The first pin of the WIFI module P2 is connected to the first pin of the resistor R4; the second pin is connected to the first pin of the inductor L2 and is connected to the GND line through the capacitor C18, the capacitor C19 and the diode TVS5; the seventh pin is connected to the GND line; the eighth pin is connected to the first pin of the resistor R5; the second pin of the resistor R5 is connected to the UART2RX line; the second pin of the resistor R4 is connected to the UART2TX line.

[0032] Optionally, it also includes: an auxiliary power supply unit;

[0033] The auxiliary power supply unit includes a USB interface unit, a battery charging management unit, a lithium battery power supply unit and an OLED display unit;

[0034] The USB interface unit is connected to the USB interface outside the main housing;

[0035] The USB interface unit, the lithium battery power supply unit and the OLED display unit are all connected to the core computing unit;

[0036] The battery charging management unit is connected to the USB interface unit and the lithium battery power supply unit respectively.

[0037] Optionally, the USB interface unit specifically includes: a TYPE-C interface, a protocol conversion chip U1 and a common mode inductor U5;

[0038] The 1st, 2nd, 15th and 16th pins of the TYPE-C interface are connected to the GND line as the zero potential of the whole board; the 3rd, 4th, 13th and 14th pins are connected to the VUSB line as the power input for lithium battery charging; the 7th and 9th pins are connected to the Dpin line as the positive electrode of the USB data line; the 8th and 10th pins are connected to the DNin line as the negative electrode of the USB data line; the 5th, 6th, 11th and 12th pins are left floating and not electrically connected;

[0039] DPin is connected to the 6th pin of the common mode inductor U5, PNin is connected to the 5th pin of the common mode inductor U10, and the 1st and 2nd pins of the common mode inductor U5 are connected to the 6th and 7th pins of the protocol conversion chip U1 through the CH340_UD+ line and the CH340_UD- line respectively;

[0040] The 5th and 19th pins of the protocol conversion chip U1 are connected to the VCC line; the 8th pin is connected to the GND line; the 3rd and 4th pins are connected in series to the UART1RX line and the UART1TX line through the resistor R1 and the resistor R2 respectively; the 9th and 10th pins are connected in series to the 1st and 3rd pins of the passive crystal oscillator Y1 respectively; the 15th pin is connected in series to the VCC line through the capacitor C4 and the resistor R3; the 1st, 2nd, 11th, 12th, 13th, 14th, 16th, 17th, 18th and 20th pins are left floating;

[0041] Pin 1 and pin 3 of the passive crystal oscillator Y1 are connected to the GND line through capacitor C2 and capacitor C3 respectively.

[0042] Optionally, the battery charging management unit specifically includes:

[0043] The VUSB line is connected to the 4th pin of the lithium battery management chip U2 as the input end of the charging power supply; the VUSB line is connected to the GND line through capacitor E1, capacitor C6 and capacitor C7;

[0044] The first pin of the lithium battery management chip U2 is connected in series to the GND line through the resistor R6; the second pin is connected in series to the GND line through the resistor R7; the third pin is directly electrically connected to the GND line; the fifth pin is connected to the second pin of the lithium battery P3 through the BAT+ line, and the first pin of the lithium battery P3 is connected to the GND line; the sixth pin is connected in series to the VUSB line through the resistor R9, and the light-emitting diode LED2; the seventh pin is connected in series to the VUSB line through the resistor R8, and the light-emitting diode LED1;

[0045] When the lithium battery is in the charging state, the pin 7 of the lithium battery management chip U2 generates a low level, thereby lighting up the light-emitting diode LED1; when the lithium battery is in the fully charged state, the pin 6 of the lithium battery management chip U2 generates a low level, thereby lighting up the light-emitting diode LED2.

[0046] Optionally, the lithium battery power supply unit specifically includes:

[0047] The BAT+ line is connected in series to the VBUS line through the diode VD1; the VUSB line is connected in series to the VBUS line through the diode VD2. The VBUS line is used as the power supply for the entire board. By using the reverse cut-off characteristic of the diode, when the VUSB power supply is connected, the VBUS line is powered by the VUSB line. When there is no voltage on the VUSB line, the VBUS line is powered by the BAT+ line.

[0048] The VBUS line is connected to the second pin of the slide switch S1, and the first pin of the slide switch S1 is connected to the first pin of the inductor L4; the second pin of the inductor L4 is connected to the eighth, ninth, and tenth pins of the boost chip U4 and the second pin of the inductor L2; and is connected to the GND line through capacitors E2, E3, C8, C9, and C10. The 1st, 2nd, 11th and 13th pins of the boost chip U4 are connected to the GND line; the 4th, 5th and 6th pins are connected to the +5 line; the 3rd and 14th pins are connected to the 1st pin of the inductor L3; the 12th pin is connected to the 1st pin of the resistor R10 and the 1st pin of the resistor R11; the 2nd pin of the resistor R10 is connected to the +5 line; the 2nd pin of the resistor R11 is connected to the GND line; the +5 line is connected to the GND line via capacitors E4, E5, C11, C12 and C13 respectively;

[0049] The +5 line is connected to the GND line through capacitor E6 and capacitor C14, and is electrically connected to the third pin of the voltage regulator chip U4;

[0050] The first pin of the voltage regulator chip U4 is connected to the GND line; the second pin is connected to the VCC line, and is bridged to the GND line through capacitors E7 and C15.

[0051] Optionally, the OLED display unit specifically includes:

[0052] The first pin of the OLED module P1 is connected to the GND line; the second pin is connected to the first pin of the inductor L1 and connected to the GND line through the capacitor C16, the capacitor C17 and the diode TVS2; the third pin is connected to the I2C1SCL line; the fourth pin is connected to the I2C1SDA line;

[0053] The I2C1SCL line is connected to the GND line through the diode TVS4; the I2C1SDA line is connected to the GND line through the diode TVS3; and the second pin of the inductor L1 is connected to the VCC line.

[0054] According to the specific embodiments provided by the utility model, the utility model discloses the following technical effects: the utility model performs wireless communication through a wireless communication unit, and is equipped with automatic calibration and calibration functions through a core computing unit. The core computing unit adopts an STM32 single-chip microcomputer as the computing core of the entire system. By being equipped with automatic calibration and calibration functions, manual intervention is no longer required. The intensity of the ultraviolet light source is monitored in real time and uploaded to the target printer through a built-in wireless communication module to realize light intensity feedback adjustment, thereby realizing the light intensity calibration function of the target printer light source and ensuring the accuracy and consistency of the light source output.

[0055] The automated calibration process greatly improves the efficiency of calibrating the printer light source. The elimination of the manual reading collection and input required in the traditional calibration process eliminates the possibility of human error and ensures the accuracy of the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0057] Figure 1 The structure diagram of the ultraviolet light intensity detector provided by the utility model for convenient wireless data collection; wherein, Figure 1 (a) is a front perspective view of a UV light intensity detector for facilitating wireless data collection; Figure 1 (b) is a bottom perspective view of a UV light intensity detector for facilitating wireless data collection;

[0058] Figure 2 This is a circuit diagram of an ultraviolet light intensity collection unit;

[0059] Figure 3 Schematic diagram of the core computing unit circuit

[0060] Figure 4 is a schematic diagram of a wireless communication unit circuit;

[0061] Figure 5 The circuit connection diagram provided by the utility model

[0062] Figure 6 This is a schematic diagram of the USB interface unit circuit;

[0063] Figure 7 This is a circuit diagram of a battery charging management unit;

[0064] Figure 8 This is a schematic diagram of the auxiliary power supply circuit-DCDC boost circuit;

[0065] Fig. 9 This is a schematic diagram of the auxiliary power supply circuit - LDO linear voltage regulator circuit;

[0066] Fig.10 This is a schematic diagram of the OLED display unit circuit. DETAILED DESCRIPTION

[0067] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0068] The utility model aims to provide an ultraviolet light intensity detector which is convenient for wireless data collection, improves calibration efficiency and reduces operation errors.

[0069] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0070] Example 1

[0071] like Figure 1As shown, the utility model provides an ultraviolet light intensity detector that is convenient for wireless data collection, including: a main shell 1; a display screen 2 and a USB interface 3 are provided on the main shell, and a photosensitive hole 4 is left; the interior of the main shell 1 includes a battery charging management unit 6, an ultraviolet light intensity collection unit 9, a core computing unit 8 and a wireless communication unit 10; the ultraviolet light intensity collection unit 9 is used to collect external ultraviolet light passing through the photosensitive hole 4; the battery charging management unit 6 is respectively connected to the ultraviolet light intensity collection unit 9 and the wireless communication unit 10, and is used to process the intensity data of the external ultraviolet light collected by the ultraviolet light intensity collection unit 9, and transmit it to the host computer through the wireless communication unit 10; the battery charging management unit 6 is equipped with automatic calibration and calibration functions.

[0072] Furthermore, a liquid crystal display area (display screen 2) is arranged on the upper part of the main shell 1 for intuitively displaying the collected light intensity data; a USB interface 3 is provided on the side of the main shell 1 for charging the lithium battery contained therein; a photosensitive hole 4 is provided at the bottom of the main shell 1 so that external ultraviolet light can radiate to the ultraviolet light intensity collection and transmission circuit board (i.e., the ultraviolet light intensity collection and transmission circuit board 9), and the ultraviolet light intensity collection and transmission circuit board can convert the light intensity into a digital electrical signal for collection.

[0073] In practical applications, the ultraviolet light intensity collection unit 9 is a gallium nitride-based photosensor; the gallium nitride-based photosensor is used to collect the light intensity data of external ultraviolet light and convert the light intensity data into a calibrable and quantifiable voltage signal.

[0074] In practical applications, such as Figure 2 As shown, the ultraviolet light intensity collection unit 9 specifically includes: the second pin of the photosensitive diode SD1 is connected to the GND circuit; the first pin is connected to the fourth pin of the operational amplifier U7;

[0075] The first pin of the operational amplifier U7 is connected to the first pin of the resistor R18 and the first pin of the resistor R19; the second pin and the third pin are connected to the GND line, and the fifth pin is connected to the VCC line;

[0076] The VCC line is connected to the GND line through capacitor C20; the second pin of resistor R18 is connected to the LIGHT_SENSOR1 line;

[0077] The second pin of the resistor R19 is connected to the first pin of the photodiode SD1; a capacitor C27 is connected between the first pin and the second pin;

[0078] The LIGHT_SENSOR1 line passes through capacitor C28 and diode TVS6 to the GND line.

[0079] Furthermore, the ultraviolet light intensity collection unit 9 converts the ultraviolet radiation intensity into current through a gallium nitride photosensor, processes it through an operational amplifier, and transmits it to the battery charging management unit 6 for collection and processing.

[0080] Furthermore, SD1 is a gallium nitride-based photodiode. By utilizing its special material properties, the intensity of ultraviolet light radiated to its photosensitive area can be linearly converted into an induced current Is. Gallium nitride (GaN) is a third-generation wide-bandgap semiconductor material with a bandgap width of 3.4eV, corresponding to a cut-off wavelength of 365nm. It has no response to visible light, which overcomes the shortcomings of silicon-based ultraviolet sensors that have a strong response to visible light and low ultraviolet sensitivity. It is an ideal material for preparing ultraviolet sensors. Using a gallium nitride-based photodiode as the photosensor of this embodiment can effectively filter out the influence of visible light on the measurement results. Thereby, more stable and accurate ultraviolet light intensity data can be collected.

[0081] Furthermore, SD can sense a direct current with a corresponding linear relationship according to the light intensity irradiated on its photosensitive surface. This induced current Is is amplified by a first stage of operation and converted into a collectible induced voltage which is transmitted to the battery charging management unit 6 .

[0082] In this embodiment, the calculation formula of the induced voltage is: Vout=Is*R32=Is*100K.

[0083] Vout is the induced voltage, and Is is the induced current induced by the photosensitive area of ​​the photodiode. In this embodiment, the current magnitude of Is is linearly related to the light intensity radiated to the surface of the gallium nitride-based photodiode. Therefore, by collecting the magnitude of the Vout voltage through the above formula, the data of the ultraviolet light intensity can be calculated.

[0084] This induced voltage is collected by the high-resolution ADC acquisition module of the battery charging management unit 6, and after calibration, high-resolution and high-accuracy ultraviolet light intensity data collection can be completed.

[0085] In practical applications, such as Figure 3 As shown, the battery charging management unit 6 specifically includes:

[0086] The 4th and 6th pins of the core computing chip U6 are connected to the VCC line; the 7th pin is connected to the GND line; the 8th pin is connected to the 3rd pin of the active crystal oscillator Y2; the 10th pin is connected to the 1st pin of the resistor R13 and the 1st pin of the capacitor C25; the 13th pin and the 14th pin are connected to the UART2TX line and the UART2RX line respectively; the 16th pin is connected to the LIGHT_SENSOR1 line; the 20th pin is connected to the BAT_CHK line; the 21st pin is connected to the KEY1 line; the 22nd pin is connected to the CHK_USB line; the 23rd pin is connected to the PWR_ONOFF line; the 29th pin is connected to the UART1TX line; the 32nd pin is connected to the UART1RX line; the 47th pin is connected to the I2C1SCL line; the 48th pin is connected to the I2C1SDA line;

[0087] The VCC line is connected to the GND line through capacitors C21, C22, C23 and C24;

[0088] The second pin of resistor R13 is connected to the VCC line;

[0089] The second pin of capacitor C25 is connected to the GND line;

[0090] The first pin of the active crystal oscillator Y2 is connected to the first pin of the resistor R12; the second pin is connected to the GND line; the third pin is connected to the eighth pin of the core computing chip U6; the fourth pin of the active crystal oscillator Y2 is connected to the VCC line;

[0091] The first pin of resistor R16 is connected to the VCC line; the second pin is connected to the I2C1SDA line;

[0092] The first pin of resistor R17 is connected to the VCC line; the second pin is connected to the I2C1SCL line;

[0093] The first pin of resistor R15 is connected to the VCC line; the second pin is connected to the UART1RX line;

[0094] The first pin of the resistor R14 is connected to the VCC line; the second pin is connected to the UART2RX line.

[0095] Furthermore, after the battery charging management unit 6 collects the light intensity data, it performs mean optimization processing on the data, then drives the OLED display unit 11 for display, and wirelessly transmits the mean-optimized light intensity data through the wireless communication unit 10.

[0096] Furthermore, the core computing chip U7 uses an STM32 single-chip microcomputer as the computing core of the entire system. The STM32 single-chip microcomputer is a 32-bit microcontroller launched by STMicroelectronics (ST), based on the ARM Cortex-Mx core architecture. The STM32 single-chip microcomputer has the advantages of high performance, low power consumption, and easy development, and is widely used in embedded systems, intelligent control, the Internet of Things, robots and other fields. In this embodiment, the STM32G0 series single-chip microcomputer is used to collect hardware resources with its built-in ADC, which can realize the collection of high-precision data.

[0097] After a step, the computing core of the battery charging management unit 6 adopts the STM32G030C8T6 chip. This is an Arm32-bit Cortex-M0 series MCU, which supports a maximum main frequency of 64Mhz. It supports multiple data interface interactions and supports multi-channel ADC acquisition. In this embodiment, UART1RX and UART1TX are USB data interfaces for data interaction with the USB interface unit 5. UART2RX and UART2TX are wireless communication data interfaces for driving the wireless module to perform wireless data transmission. I2C1SDA and I2C1SCL are liquid crystal communication data interfaces for driving the OLED liquid crystal screen display.

[0098] SWCLK / BOOT0 and SWDIO are program download interfaces for burning firmware programs. LIGHT_SENSOR1 is an ultraviolet light intensity data acquisition interface for collecting the induced voltage signal transmitted by the ultraviolet light intensity acquisition unit 9.

[0099] In practical applications, such as Figure 4 As shown, the wireless communication unit 10 specifically includes: the first pin of the WIFI module P2 is connected to the first pin of the resistor R4; the second pin is connected to the first pin of the inductor L2 and is connected to the GND line through the capacitor C18, the capacitor C19 and the diode TVS5; the seventh pin is connected to the GND line; the eighth pin is connected to the first pin of the resistor R5; the second pin of the resistor R5 is connected to the UART2RX line; the second pin of the resistor R4 is connected to the UART2TX line.

[0100] Furthermore, P3 is an ESP-01S communication module, which is a Wi-Fi module that supports IEEE802.11 b / g / n protocols and a complete TCP / IP protocol stack. The core computing unit can complete a series of functions such as network hotspot construction and network data transmission through the UART communication driver. In this specific embodiment, the core computing unit builds a WIFI hotspot through the UART control module and opens a UDP service for wireless data interaction with other devices.

[0101] In this embodiment, the battery charging management unit 6 communicates with the wireless communication unit 10 through the UART2RX and UART2TX signal lines based on the UART communication protocol. And the built-in WIFI communication protocol is implemented by writing a program:

[0102] Other devices can obtain the currently collected light intensity power data by sending the adt+getsensorpwr field through WIFI communication.

[0103] Other devices send adt+setADCtable=index, ADC, pwr fields through WIFI communication, so that this embodiment can update the stored standard calibration point data, where index is the current brightness level, ADC is the collected induced voltage, and pwr is the theoretical light intensity power data.

[0104] Furthermore, by adopting a modular design to connect the WIFI module, the function of WIFI wireless data interaction can be realized by directly adopting a solution that is widely used and stable in the market. This effectively reduces the R&D cycle and implementation cost. In addition, the modular design can realize the preferred solution of quickly replacing the wireless communication unit 10, leaving space for more flexible applications in the later stage.

[0105] In practical applications, such as Figure 5 As shown, the utility model further includes: an auxiliary power supply unit; the auxiliary power supply unit includes a USB interface unit 5, a battery charging management unit 6, a lithium battery power supply unit 7 and an OLED display unit 11.

[0106] The USB interface unit 5 is connected to the USB interface 3 outside the main housing 1 .

[0107] The USB interface unit 5 , the lithium battery power supply unit 7 and the OLED display unit 11 are all connected to the battery charging management unit 6 .

[0108] The battery charging management unit 6 is connected to the USB interface unit 5 and the lithium battery power supply unit 7 respectively.

[0109] In practical applications, such as Figure 6 As shown, the USB interface unit 5 specifically includes: a TYPE-C interface, a protocol conversion chip U1 and a common mode inductor U5;

[0110] The 1st, 2nd, 15th and 16th pins of the TYPE-C interface are connected to the GND line as the zero potential of the whole board; the 3rd, 4th, 13th and 14th pins are connected to the VUSB line as the power input for lithium battery charging; the 7th and 9th pins are connected to the Dpin line as the positive electrode of the USB data line; the 8th and 10th pins are connected to the DNin line as the negative electrode of the USB data line; the 5th, 6th, 11th and 12th pins are left floating and not electrically connected;

[0111] DPin is connected to the 6th pin of the common mode inductor U5, PNin is connected to the 5th pin of the common mode inductor U10, and the 1st and 2nd pins of the common mode inductor U5 are connected to the 6th and 7th pins of the protocol conversion chip U1 through the CH340_UD+ line and the CH340_UD- line respectively;

[0112] The 5th and 19th pins of the protocol conversion chip U1 are connected to the VCC line; the 8th pin is connected to the GND line; the 3rd and 4th pins are connected in series to the UART1RX line and the UART1TX line through the resistor R1 and the resistor R2 respectively; the 9th and 10th pins are connected in series to the 1st and 3rd pins of the passive crystal oscillator Y1 respectively; the 15th pin is connected in series to the VCC line through the capacitor C4 and the resistor R3; the 1st, 2nd, 11th, 12th, 13th, 14th, 16th, 17th, 18th and 20th pins are left floating;

[0113] Pin 1 and pin 3 of the passive crystal oscillator Y1 are connected to the GND line through capacitor C2 and capacitor C3 respectively.

[0114] Furthermore, the USB interface 3 adopts a Type C interface, in which the data lines DPin and DNin are filtered by the common mode filter ECMF02 and transmitted to the data conversion chip CH340T. After protocol conversion, they are connected to the battery charging management unit 6 through the UART data interface.

[0115] The power line VUSB in the Type C interface is electrically connected to the lithium battery charging management unit 6 to provide power input for charging the lithium battery.

[0116] Furthermore, the power interface of the USB interface unit 5 is electrically connected to the lithium battery charging management unit 6, and the charging interface of the lithium battery charging management unit 6 is electrically connected to the lithium battery power supply unit 7. The lithium battery power supply unit 7 converts a stable 3.3V voltage to power the ultraviolet light intensity collection unit 9, the battery charging management unit 6, the OLED display unit 11, and the wireless communication unit 10.

[0117] The data interface of the USB interface unit 5 is electrically connected to the battery charging management unit 6 , providing a wired data interaction interface.

[0118] Furthermore, the protocol conversion chip U1 is a CH340T chip. Using the CH340T chip solution as a USB protocol to serial communication protocol to connect to the computing core chip for data interaction is a widely used communication solution with the advantages of stable communication and low cost. Connecting the common mode inductor U10 in series in the communication data line can effectively filter out the common mode noise in the communication data link, further enhancing the communication stability.

[0119] In practical applications, such as Figure 7 As shown, the battery charging management unit 6 specifically includes: a VUSB line connected to the 4th pin of the lithium battery management chip U2 as the input end of the charging power supply; the VUSB line is connected to the GND line through the capacitor E1, the capacitor C6 and the capacitor C7;

[0120] The first pin of the lithium battery management chip U2 is connected in series to the GND line through the resistor R6; the second pin is connected in series to the GND line through the resistor R7; the third pin is directly electrically connected to the GND line; the fifth pin is connected to the second pin of the lithium battery P3 through the BAT+ line, and the first pin of the lithium battery P3 is connected to the GND line; the sixth pin is connected in series to the VUSB line through the resistor R9, and the light-emitting diode LED2; the seventh pin is connected in series to the VUSB line through the resistor R8, and the light-emitting diode LED1;

[0121] When the lithium battery is in the charging state, the pin 7 of the lithium battery management chip U2 generates a low level, thereby lighting up the light-emitting diode LED1; when the lithium battery is in the fully charged state, the pin 6 of the lithium battery management chip U2 generates a low level, thereby lighting up the light-emitting diode LED2.

[0122] Furthermore, the lithium battery management chip U2 is TP4056. The TP4056 lithium battery charging management IC is used to manage the lithium battery charging current, which is a general-purpose low-cost solution for charging management of portable charging devices.

[0123] The lithium battery charging management chip adopts the TP4056 integrated chip, which provides programmable constant current charging management up to 1A for lithium batteries, and also provides practical functions such as undervoltage lockout, automatic recharging, and LED indication of charging status.

[0124] The utility model can provide a programmable charging current of 1A and can automatically generate a charging indication signal. In this embodiment, when the lithium battery is in a charging state, the 7th pin of the charging management IC U2 will generate a low level, so that the red light-emitting tube LED is lit. When the lithium battery is in a fully charged state, the 6th pin of the charging management IC U2 will generate a low level, so that the green light-emitting tube LED2 is lit.

[0125] In practical applications, such as Figure 8-Figure 9 As shown, the lithium battery power supply unit 7 specifically includes: a BAT+ line is connected in series to a VBUS line through a diode VD1; a VUSB line is connected in series to a VBUS line through a diode VD2, and the VBUS line is used as a power supply for the entire board. By utilizing the reverse cut-off characteristic of the diode, when the VUSB power supply is connected, the VBUS line is powered by the VUSB line, and when the VUSB line has no voltage, the VBUS line is powered by the BAT+ line.

[0126] The VBUS line is connected to the second pin of the slide switch S1, and the first pin of the slide switch S1 is connected to the first pin of the inductor L4; the second pin of the inductor L4 is connected to the eighth, ninth, and tenth pins of the boost chip U4 and the second pin of the inductor L2; and is connected to the GND line through capacitors E2, E3, C8, C9, and C10. The 1st, 2nd, 11th and 13th pins of the boost chip U4 are connected to the GND line; the 4th, 5th and 6th pins are connected to the +5 line; the 3rd and 14th pins are connected to the 1st pin of the inductor L3; the 12th pin is connected to the 1st pin of the resistor R10 and the 1st pin of the resistor R11; the 2nd pin of the resistor R10 is connected to the +5 line; the 2nd pin of the resistor R11 is connected to the GND line; the +5 line is connected to the GND line via capacitors E4, E5, C11, C12 and C13 respectively;

[0127] The +5 line is connected to the GND line through capacitor E6 and capacitor C14, and is electrically connected to the third pin of the voltage regulator chip U4;

[0128] The first pin of the voltage regulator chip U4 is connected to the GND line; the second pin is connected to the VCC line, and is bridged to the GND line through capacitors E7 and C15.

[0129] Further, in Figure 7-Figure 8In the figure, VBUS is the positive input of the lithium battery power supply, which is boosted to 5V by the boost chip MP3421GG-Z; the 5V voltage is then stepped down and stabilized to 3.3V by the SPX1117M3-3.3 chip. The VCC power supply is 3.3V; this power supply provides power input for the ultraviolet light intensity acquisition unit 9, the battery charging management unit 6, the OLED display unit 11 and the wireless communication unit 10.

[0130] The boost chip MP3421GG-Z is a high-efficiency synchronous current mode boost converter with input and output disconnect function. The startup voltage is as low as 1.9V, and it can also provide inrush current limitation and output short circuit protection. The linear regulator SPX1117M3-3.3 is a 3.3V fixed output low voltage drop linear regulator.

[0131] Furthermore, since the voltage of the lithium battery will change with the change of battery power, generally ranging from 3.0-4.2V, in order to ensure the provision of good and stable power supply to the entire board, this practical example adopts the solution of first boosting the lithium battery voltage to 5V, and then using LDO linear voltage regulator to 3.3V to connect to the VCC line to power the entire board. This design can eliminate the impact of lithium battery voltage changes on system power supply.

[0132] In practical applications, such as Fig.10 As shown, the OLED display unit 11 specifically includes: the first pin of the OLED module P1 is connected to the GND line; the second pin is connected to the first pin of the inductor L1 and is connected to the GND line through the capacitor C16, the capacitor C17 and the diode TVS2; the third pin is connected to the I2C1SCL line; the fourth pin is connected to the I2C1SDA line;

[0133] The I2C1SCL line is connected to the GND line through the diode TVS4; the I2C1SDA line is connected to the GND line through the diode TVS3; and the second pin of the inductor L1 is connected to the VCC line.

[0134] Furthermore, the OLED module P2 is used as a display module, which can intuitively display the collected light intensity data, real-time display of battery power data, WIFI networking status indication, WIFI hotspot information display and other intuitive interactive windows. Create a convenient and efficient operation experience in actual use. Connecting TVS3, TVS4, and TVS5 across the 2nd, 3rd, and 4th pins of the OLED module P2 can prevent static electricity from entering the circuit board through the interface and causing high-voltage breakdown problems. Effectively improve the yield rate in the production process. Connecting inductor L5 in series between the VCC line and the 2nd pin of P2, and connecting it to the ground through capacitors C34 and C35, can effectively filter out the high frequency in the power supply, thereby providing a more stable power supply environment.

[0135] Furthermore, a 1.3-inch OLED module driven by SH1106 is used for data display. This module can be controlled by I2C protocol signals to draw dot matrix characters on the screen.

[0136] When producing and assembling this specific embodiment, it is necessary to use a standard light source with adjustable brightness to calibrate the light intensity value after completing the circuit board welding, assembly, and assembly of the housing.

[0137] The specific calibration scheme in this embodiment is as follows:

[0138] A 3D printer that has been calibrated in a traditional way is used as a standard light source. The brightness of the light source can be adjusted by setting the light source driving current.

[0139] When using the traditional method to calibrate the standard light source, a high-precision standard optical power acquisition instrument is used to record the light intensity power of the standard light source at each brightness level as the theoretical light intensity power of this standard light source at each brightness level.

[0140] Under the same conditions, the light intensity of the standard light source is collected using the example of the utility model, and the current brightness level and the theoretical light intensity power data of the current brightness level are sent to the embodiment of the utility model through WIFI wireless communication.

[0141] In the present invention, the induced voltage collected during calibration is stored correspondingly to the theoretical light intensity power data to form a standard calibration point.

[0142] By adjusting the multi-level brightness of the standard light source and repeating the above process, data collection of multiple standard calibration points can be achieved. When collecting light intensity data in the future, the collected induced voltage can be linearly calculated by referring to the data of these standard calibration points to calculate accurate light intensity data.

[0143] Since this specific embodiment supports WIFI wireless communication and realizes the function of remote calibration, the calibration process here can be fully automated. In addition, very intensive multi-point calibration can be performed, which greatly improves the acquisition accuracy.

[0144] When actually using this specific embodiment, it is only necessary to turn on the power switch and align the photosensitive hole 4 with the incident direction of the light source. The currently collected light intensity data can be intuitively viewed through the LCD screen 2. The function of automatically calibrating the target light source can be conveniently realized through the built-in WIFI communication protocol. The specific operation process is as follows:

[0145] The target 3D printer performs WIFI networking through the WIFI hotspot opened in this embodiment.

[0146] The target 3D printer turns on the light source and adjusts it to the brightness to be calibrated.

[0147] The utility model is used to collect the power of the current light source of the target 3D printer.

[0148] The target 3D printer sends the adt+getsensorpwr field to collect the actual light source power through the built-in WIFI communication protocol.

[0149] The target 3D printer writes the actual data into the calibration table of the current brightness to complete the calibration of a calibration point.

[0150] By repeating the above process through the built-in program, multi-point calibration of the light source can be completed automatically.

[0151] The above optimization process is completed by the utility model, which can bring the following beneficial effects:

[0152] The process efficiency of calibrating 3D printer light sources is greatly improved.

[0153] Since the process of manual reading collection and input in the traditional calibration process is eliminated, the possibility of human operation errors can be eliminated, ensuring the accuracy of the process.

[0154] Since the present specific embodiment supports wireless communication and realizes the function of remote self-calibration, a controllable standard light source can be used to perform very intensive multi-point calibration on the detector, thereby greatly improving its acquisition accuracy.

[0155] The UV light intensity detector is equipped with automatic calibration and calibration functions, which no longer requires manual intervention. Through wireless communication, the detector can automatically calibrate and calibrate the intensity of the target UV light source, greatly improving the operating efficiency and avoiding the possibility of human operation errors.

[0156] The use of gallium nitride-based photosensors can effectively eliminate the influence of visible light changes on the collection of ultraviolet light intensity. When collecting ultraviolet light intensity data, it is no longer necessary to create a darkroom to eliminate the influence of the visible light band.

[0157] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0158] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. At the same time, for those skilled in the art, according to the ideas of the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. An ultraviolet light intensity detector that is convenient for wireless data collection, characterized in that: include: main housing; A photosensitive hole is left on the main shell; the interior of the main shell includes an ultraviolet light intensity collection unit, a core computing unit and a wireless communication unit; The ultraviolet light intensity collection unit is used to collect external ultraviolet light passing through the photosensitive hole; The core computing unit is connected to the ultraviolet light intensity collection unit and the wireless communication unit respectively, and is used to process the intensity data of external ultraviolet light collected by the ultraviolet light intensity collection unit and transmit it to the host computer through the wireless communication unit; the core computing unit is equipped with automatic calibration and calibration functions.

2. The ultraviolet light intensity detector for wireless data collection according to claim 1, characterized in that: The ultraviolet light intensity collection unit is a gallium nitride-based photosensor; The gallium nitride-based photosensor is used to collect light intensity data of external ultraviolet light and convert the light intensity data into a calibrable and quantifiable voltage signal.

3. The ultraviolet light intensity detector for wireless data collection according to claim 1, characterized in that: The ultraviolet light intensity collection unit specifically comprises: The second pin of the photodiode SD1 is connected to the GND line; the first pin is connected to the fourth pin of the operational amplifier U7; The first pin of the operational amplifier U7 is connected to the first pin of the resistor R18 and the first pin of the resistor R19; the second pin and the third pin are connected to the GND line, and the fifth pin is connected to the VCC line; The VCC line is connected to the GND line through capacitor C20; the second pin of resistor R18 is connected to the LIGHT_SENSOR1 line; The second pin of the resistor R19 is connected to the first pin of the photodiode SD1; a capacitor C27 is connected between the first pin and the second pin; The LIGHT_SENSOR1 line passes through capacitor C28 and diode TVS6 to the GND line.

4. The ultraviolet light intensity detector for wireless data collection according to claim 1, characterized in that: The core computing unit specifically includes: The 4th and 6th pins of the core computing chip U6 are connected to the VCC line; the 7th pin is connected to the GND line; the 8th pin is connected to the 3rd pin of the active crystal oscillator Y2; the 10th pin is connected to the 1st pin of the resistor R13 and the 1st pin of the capacitor C25; the 13th pin and the 14th pin are connected to the UART2TX line and the UART2RX line respectively; the 16th pin is connected to the LIGHT_SENSOR1 line; the 20th pin is connected to the BAT_CHK line; the 21st pin is connected to the KEY1 line; the 22nd pin is connected to the CHK_USB line; the 23rd pin is connected to the PWR_ONOFF line; the 29th pin is connected to the UART1TX line; the 32nd pin is connected to the UART1RX line; the 47th pin is connected to the I2C1SCL line; the 48th pin is connected to the I2C1SDA line; The VCC line is connected to the GND line through capacitors C21, C22, C23 and C24; The second pin of resistor R13 is connected to the VCC line; The second pin of capacitor C25 is connected to the GND line; The first pin of the active crystal oscillator Y2 is connected to the first pin of the resistor R12; the second pin is connected to the GND line; the third pin is connected to the eighth pin of the core computing chip U6; the fourth pin of the active crystal oscillator Y2 is connected to the VCC line; The first pin of resistor R16 is connected to the VCC line; the second pin is connected to the I2C1SDA line; The first pin of resistor R17 is connected to the VCC line; the second pin is connected to the I2C1SCL line; The first pin of resistor R15 is connected to the VCC line; the second pin is connected to the UART1RX line; The first pin of the resistor R14 is connected to the VCC line; the second pin is connected to the UART2RX line.

5. The ultraviolet light intensity detector for wireless data collection according to claim 1, characterized in that: The wireless communication unit specifically includes: The first pin of the WIFI module P2 is connected to the first pin of the resistor R4; the second pin is connected to the first pin of the inductor L2 and is connected to the GND line through the capacitor C18, the capacitor C19 and the diode TVS5; the seventh pin is connected to the GND line; the eighth pin is connected to the first pin of the resistor R5; the second pin of the resistor R5 is connected to the UART2RX line; the second pin of the resistor R4 is connected to the UART2TX line.

6. The ultraviolet light intensity detector for wireless data collection according to claim 1, characterized in that: Also includes: Auxiliary power supply unit; The auxiliary power supply unit includes a USB interface unit, a battery charging management unit, a lithium battery power supply unit and an OLED display unit; The USB interface unit is connected to the USB interface outside the main housing; The USB interface unit, the lithium battery power supply unit and the OLED display unit are all connected to the core computing unit; The battery charging management unit is connected to the USB interface unit and the lithium battery power supply unit respectively.

7. The ultraviolet light intensity detector for facilitating wireless data collection according to claim 6, characterized in that: The USB interface unit specifically includes: a TYPE-C interface, a protocol conversion chip U1 and a common mode inductor U5; The 1st, 2nd, 15th and 16th pins of the TYPE-C interface are connected to the GND line as the zero potential of the whole board; the 3rd, 4th, 13th and 14th pins are connected to the VUSB line as the power input for lithium battery charging; the 7th and 9th pins are connected to the Dpin line as the positive electrode of the USB data line; the 8th and 10th pins are connected to the DNin line as the negative electrode of the USB data line; the 5th, 6th, 11th and 12th pins are left floating and not electrically connected; DPin is connected to the 6th pin of the common mode inductor U5, PNin is connected to the 5th pin of the common mode inductor U10, and the 1st and 2nd pins of the common mode inductor U5 are connected to the 6th and 7th pins of the protocol conversion chip U1 through the CH340_UD+ line and the CH340_UD- line respectively; The 5th and 19th pins of the protocol conversion chip U1 are connected to the VCC line; the 8th pin is connected to the GND line; the 3rd and 4th pins are connected in series to the UART1RX line and the UART1TX line through the resistor R1 and the resistor R2 respectively; the 9th and 10th pins are connected in series to the 1st and 3rd pins of the passive crystal oscillator Y1 respectively; the 15th pin is connected in series to the VCC line through the capacitor C4 and the resistor R3; the 1st, 2nd, 11th, 12th, 13th, 14th, 16th, 17th, 18th and 20th pins are left floating; Pin 1 and pin 3 of the passive crystal oscillator Y1 are connected to the GND line through capacitor C2 and capacitor C3 respectively.

8. The ultraviolet light intensity detector for facilitating wireless data collection according to claim 6, characterized in that: The battery charging management unit specifically includes: The VUSB line is connected to the 4th pin of the lithium battery management chip U2 as the input end of the charging power supply; the VUSB line is connected to the GND line through capacitor E1, capacitor C6 and capacitor C7; The first pin of the lithium battery management chip U2 is connected in series to the GND line through the resistor R6; the second pin is connected in series to the GND line through the resistor R7; the third pin is directly electrically connected to the GND line; the fifth pin is connected to the second pin of the lithium battery P3 through the BAT+ line, and the first pin of the lithium battery P3 is connected to the GND line; the sixth pin is connected in series to the VUSB line through the resistor R9, and the light-emitting diode LED2; the seventh pin is connected in series to the VUSB line through the resistor R8, and the light-emitting diode LED1; When the lithium battery is in the charging state, the pin 7 of the lithium battery management chip U2 generates a low level, thereby lighting up the light-emitting diode LED1; when the lithium battery is in the fully charged state, the pin 6 of the lithium battery management chip U2 generates a low level, thereby lighting up the light-emitting diode LED2.

9. The ultraviolet light intensity detector for facilitating wireless data collection according to claim 6, characterized in that: The lithium battery power supply unit specifically comprises: The BAT+ line is connected in series to the VBUS line through the diode VD1; the VUSB line is connected in series to the VBUS line through the diode VD2. The VBUS line is used as the power supply for the entire board. By using the reverse cut-off characteristic of the diode, when the VUSB power supply is connected, the VBUS line is powered by the VUSB line. When there is no voltage on the VUSB line, the VBUS line is powered by the BAT+ line. The VBUS line is connected to the second pin of the toggle switch S1, and the first pin of the toggle switch S1 is connected to the first pin of the inductor L4; the second pin of the inductor L4 is connected to the eighth, ninth, and tenth pins of the boost chip U4 and the second pin of the inductor L2; and is connected to the GND line through capacitors E2, E3, C8, C9, and C10; the first, second, 11th, and 13th pins of the boost chip U4 are connected to the GN D circuit; pin 4, pin 5, and pin 6 are connected to +5 circuit; pin 3 and pin 14 are connected to pin 1 of inductor L3; pin 12 is connected to pin 1 of resistor R10 and pin 1 of resistor R11; pin 2 of resistor R10 is connected to +5 circuit; pin 2 of resistor R11 is connected to GND circuit; +5 circuit is connected to GND circuit via capacitor E4, capacitor E5, capacitor C11, capacitor C12, and capacitor C13 respectively; The +5 line is connected to the GND line through capacitor E6 and capacitor C14, and is electrically connected to the third pin of the voltage regulator chip U4; The first pin of the voltage regulator chip U4 is connected to the GND line; the second pin is connected to the VCC line, and is bridged to the GND line through capacitors E7 and C15.

10. The ultraviolet light intensity detector for facilitating wireless data collection according to claim 6, characterized in that: The OLED display unit specifically comprises: The first pin of the OLED module P1 is connected to the GND line; the second pin is connected to the first pin of the inductor L1 and connected to the GND line through the capacitor C16, the capacitor C17 and the diode TVS2; the third pin is connected to the I2C1SCL line; the fourth pin is connected to the I2C1SDA line; The I2C1SCL line is connected to the GND line through the diode TVS4; the I2C1SDA line is connected to the GND line through the diode TVS3; and the second pin of the inductor L1 is connected to the VCC line.

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