STM32 electronic technology experiment box with liquid splashing prevention function

Abstract

The utility model relates to the field of experimental equipment, in particular to an STM32 electronic technology experimental box with liquid splashing prevention, which is characterized in that a closed shell prevents liquid from entering an internal circuit and avoids direct contact between a user and a metal part of a circuit board; a photosensitive sensor module and a temperature sensor module are arranged to monitor environmental conditions, so that the experiment is carried out under proper conditions; the MCU minimum system module receives and processes data from the photosensitive sensor module and the temperature sensor module; the nixie tube module, the first display screen module and the second display screen module are arranged to display experimental data and state information, so that a user can conveniently observe an experimental process; the key input module controls the MCU minimum system module, and the MCU minimum system module controls other modules to complete an experiment; and the USB-to-TTL serial port module and the STLINK trial debugging module are arranged, so that the MCU can communicate with other external equipment. The problem that an open type electronic circuit can be instantly burnt down due to accidental liquid splashing caused by the fact that most of the current experiment boxes do not have a liquid splashing prevention protection function is solved.

Description

Technical Field

[0001] This utility model relates to the field of experimental equipment technology, and in particular to an STM32 electronic technology experimental box with splash-proof design. Background Technology

[0002] With the increasing prevalence of electronic information technology, almost every industry relies on electronics, from large-scale applications like airplanes and ships to small household appliances and clocks. Our lives are inseparable from electronic information. At the same time, universities are paying close attention to the cultivation of electronic information professionals, resulting in a huge demand for electronic information technology equipment.

[0003] Most existing electronic technology experimental equipment lacks protection against accidental liquid splashes during operation. It is well known that electronic equipment is most vulnerable to damage during operation. Many existing open-type electronic experimental devices have poor safety features when operators are debugging, as the circuit boards are exposed to the elements without adequate protection. Accidental liquid splashes can easily cause instantaneous short circuits and damage. Furthermore, operators' hands inevitably accumulate sweat; if this sweat comes into direct contact with the metal parts of the circuit boards, it can leave residue that corrodes the boards over time, leading to equipment malfunctions. Utility Model Content

[0004] To address the problem that most current experimental chambers lack splash protection, causing open electronic circuits to burn out instantly when accidentally splashed with liquid.

[0005] This invention provides an STM32 electronic technology experimental box with splash-proof design, comprising a sealed shell and a power module and circuit board disposed inside the shell. The circuit board is arranged in a grid-like modular layout and includes a digital tube module, a USB to TTL serial port module, a photosensitive sensor module, a first display screen module, an STLINK debugging module, an MCU minimum system module, an RGB light module, a buzzer module, a second display screen module, a temperature sensor module, and a key input module. Each module is electrically connected to the MCU minimum system module through the circuit board. The power module is electrically connected to the circuit board and is used to control the on / off of the power supply to the STM32 electronic experimental box and convert the external input voltage into the power supply voltage for each module. The MCU minimum system module includes a crystal oscillator circuit and an STM32 series MCU.

[0006] Preferably, the USB to TTL serial port module includes a CH340N chip, and the STLINK debug interface module includes an STLINK debug interface for connecting external debug tools and the MCU.

[0007] Preferably, the photosensitive sensor module includes a photoresistor of model GL5516, and the temperature sensor module includes a temperature sensor of model LM75.

[0008] Preferably, the first display module includes an LCD screen, which is electrically connected to the MCU minimum system module via a 4-pin connector, and the second display module includes an OLED screen that is electrically connected to the MCU minimum system module.

[0009] Preferably, the digital tube module includes a digital tube; the RGB lamp module includes RGB LEDs and a current-limiting resistor; and the buzzer module includes a buzzer and an NPN transistor for driving the buzzer.

[0010] Preferably, the STM32 series MCU is specifically the STM32F411RET6 MCU.

[0011] Preferably, the button input module includes a button, a capacitor, and a pull-up resistor, and the button is electrically connected to the GPIO pin of the MCU.

[0012] Preferably, the circuit board also includes an LED module, which includes LEDs electrically connected to the GPIO pins of the MCU.

[0013] Preferably, an STM32 electronic technology experimental box with splash-proof design also includes a sliding rheostat. The fixed end of the sliding rheostat is electrically connected to the power module, and the sliding end of the sliding rheostat is electrically connected to the MCU through a voltage divider resistor. An adjustment knob is provided on one side of the sliding rheostat, and a hole is provided on the side of the housing. The adjustment knob passes through the hole and protrudes from the housing.

[0014] Preferably, the top surface of the housing has an opening, a transparent plate is provided above the opening, the circuit board is located below the opening, the side of the housing has a USB port, and the power module includes a three-prong power interface and a power switch located on the side of the housing.

[0015] This invention features a sealed casing to prevent liquid from entering the internal circuitry and avoids direct contact between the user and the metal parts of the circuit board. Environmental conditions are monitored by photosensitive and temperature sensor modules to ensure experiments are conducted under suitable conditions. The MCU minimum system module receives and processes data from these modules. Experimental data and status information are displayed via a digital tube module, a first display module, and a second display module, facilitating user observation of the experimental progress. A key input module controls the MCU minimum system module, which in turn controls the other modules to complete the experiment. A USB-to-TTL serial port module and an STLINK debugging module enable communication between the MCU and other external devices. This invention solves the problem that most current experimental boxes lack splash-proof protection, leading to the instantaneous burnout of open electronic circuits upon accidental liquid spillage. Attached Figure Description

[0016] Figure 1This is a top view of an STM32 electronic technology experimental box with splash-proof design provided by this utility model.

[0017] Figure 2 This utility model provides a schematic block diagram of the structure of an STM32 electronic technology experimental box with splash-proof design.

[0018] Figure 3 This is a schematic diagram of the circuit board provided by this utility model.

[0019] Figure 4 This is a schematic diagram showing the circuit board provided by this utility model concealing the LCD screen.

[0020] Figure 5 The circuit diagram of the digital tube module provided by this utility model is shown.

[0021] Figure 6 The circuit diagram of the USB to TTL serial port module provided by this utility model is shown.

[0022] Figure 7 The circuit diagram of the photosensitive sensor module provided by this utility model is shown.

[0023] Figure 8 The circuit diagram of the first display module provided by this utility model.

[0024] Figure 9 The circuit diagram of the STLINK test module provided by this utility model is shown.

[0025] Figure 10 The circuit schematic diagram is for the MCU minimum system module provided by this utility model.

[0026] Figure 11 The circuit diagram of the RGB lamp module provided by this utility model is shown.

[0027] Figure 12 The circuit diagram of the buzzer module provided by this utility model.

[0028] Figure 13 The circuit diagram of the second display module provided by this utility model.

[0029] Figure 14 The circuit diagram of the temperature sensor module provided by this utility model is shown.

[0030] Figure 15 The circuit diagram of the key input module provided by this utility model is shown.

[0031] Figure 16 The circuit diagram of the LED module provided by this utility model is shown.

[0032] Figure 17 The circuit diagram of the sliding rheostat provided by this utility model is shown.

[0033] Figure 18 The right view of an STM32 electronic technology experimental box with splash-proof design provided by this utility model.

[0034] Figure 19 The left view of an STM32 electronic technology experimental box with splash-proof design provided by this utility model.

[0035] Figure 20 The rear view of an STM32 electronic technology experimental box with splash-proof design provided by this utility model.

[0036] Figure 21 The front view of an STM32 electronic technology experimental box with splash-proof design provided by this utility model.

[0037] In the diagram: 1-House; 11-Opening; 12-USB port; 2-Power module; 21-Three-pin power interface; 22-Power switch; 3-Circuit board; 30-Digital tube module; 31-USB to TTL serial port module; 32-Photosensitive sensor module; 33-First display module; 34-STLINK trial module; 35-MCU minimum system module; 36-RGB lamp module; 37-Buzzer module; 38-Second display module; 39-Temperature sensor module; 310-Key input module; 311-LED module; 4-Adjustment knob. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0039] Reference Figures 1-21An STM32 electronic technology experimental box with splash-proof design includes a sealed shell 1 and a power module 2 and a circuit board 3 disposed inside the shell 1. The circuit board 3 is arranged in a grid-like modular layout and includes a digital tube module 30, a USB to TTL serial port module 31, a photosensitive sensor module 32, a first display module 33, an STLINK debugging module 34, an MCU minimum system module 35, an RGB light module 36, a buzzer module 37, a second display module 38, a temperature sensor module 39, and a key input module 310. Each module is electrically connected to the MCU minimum system module 35 through the circuit board 3. The power module 2 is electrically connected to the circuit board 3 and is used to control the on / off of the power supply to the STM32 electronic experimental box and convert the external input voltage into the power supply voltage for each module. The MCU minimum system module 35 includes a crystal oscillator circuit and an STM32 series MCU.

[0040] The enclosed housing 1 prevents liquid from entering the internal circuitry and avoids direct contact between the user and the metal parts of the circuit board 3. Environmental conditions are monitored by a photosensitive sensor module 32 and a temperature sensor module 39 to ensure experiments are conducted under suitable conditions. The MCU minimum system module 35 receives and processes data from the photosensitive sensor module 32 and the temperature sensor module 39. Experimental data and status information are displayed by a digital tube module 30, a first display module 33, and a second display module 38, facilitating user observation of the experimental progress. A key input module 310 controls the MCU minimum system module 35, which in turn controls the other modules to complete the experiment. A USB-to-TTL serial port module 31 and an STLINK debugging module 34 enable communication between the MCU and other external devices. This design solves the problem that most current experimental boxes lack splash protection, causing open electronic circuits to burn out instantly upon accidental liquid spillage.

[0041] In some implementations, the USB to TTL serial port module 31 includes a CH340N chip, and the STLINK debug interface module includes an STLINK debug interface for connecting external debug tools and the MCU.

[0042] Reference Figure 6 In the diagram, U13 is the CH340N chip. The CH340N chip is used to convert USB signals into TTL level serial port signals. The TXD pin of the CH340N chip is used to send data to the RXD pin of the MCU, and the RXD pin of the CH340N chip is used to receive data from the TXD pin of the MCU. (Refer to...) Figure 6 The USB-to-TTL serial port module 31 also includes a USB interface USB-B02, current-limiting resistors R49 and R50, and indicator lights LED6 and LED7 for indicating the circuit's operating status. (See reference...) Figure 9In the diagram, H3 is a 4-pin STLINK debugging interface. Pin 2 of H3 is connected to the TMS pin of the MCU, which is used for mode selection. Pin 3 of H3 is connected to the TCK pin of the MCU, which is used for clock signal. Through the TMS and TCK pins, the debugging tool can communicate with the MCU to realize breakpoint setting, single-step execution, and variable monitoring functions.

[0043] In some embodiments, the photosensitive sensor module 32 includes a photoresistor of model GL5516, and the temperature sensor module 39 includes a temperature sensor of model LM75.

[0044] Reference Figure 7 In the diagram, R45 is a photoresistor. The photosensitive sensor module 32 also includes a fixed resistor R46 and a current-limiting resistor R61. R45 and R46 form a voltage divider circuit. When the light intensity changes, the resistance of the photoresistor changes, thereby changing the output voltage of the voltage divider circuit. The output voltage of the voltage divider circuit is connected to the ADC input pin PC2 of the MCU through the current-limiting resistor R61. The MCU reads this voltage value through the ADC and calculates the light intensity based on the voltage value. (Refer to...) Figure 14 In the figure, U12 is a temperature sensor. The temperature sensor communicates with the MCU via I2C through the SDA and SCL pins. The temperature sensor accurately measures the ambient temperature and transmits the temperature data to the MCU through the I2C interface. The temperature sensor module 39 also includes pull-up resistors R43 and R44. R43 and R44 are used to ensure that the SDA and SCL lines remain at a high level when there is no signal transmission.

[0045] In some embodiments, the first display module 33 includes an LCD screen electrically connected to the MCU minimum system module 35 via a 4-pin connector, and the second display module 38 includes an OLED screen electrically connected to the MCU minimum system module 35.

[0046] Reference Figure 8 The 4-pin connector is model ZX-XH2.54-4PZZ. The MCU sends data to the LCD screen via pin PC6, and receives data from the LCD screen via pin PC7. (See reference...) Figure 13 In the diagram, OLED1 is an OLED screen, model number HS96L01W4S03. The OLED screen communicates with the MCU via I2C through SCL and SDA. The RES pin of the OLED screen is used to reset the OLED screen, which is controlled by the PB6 pin of the MCU. The CS pin of the OLED screen is used to select the OLED screen, which is controlled by the PA4 pin of the MCU.

[0047] In some embodiments, the digital tube module 30 includes a digital tube; the RGB lamp module 36 includes RGB LEDs and a current-limiting resistor; and the buzzer module 37 includes a buzzer and an NPN transistor for driving the buzzer.

[0048] Reference Figure 5 , Figure 5 LED5 in the module is a digital tube. The digital tube module 30 also includes transistors Q3, Q4, Q5, and Q6 for controlling the common terminal of the digital tube. The common terminal COM of each digital tube is connected to the power supply VDD through the transistor. MCU pins PB12, PB13, PB14, and PB15 are used to control the common terminal of the digital tube. When pins PB12, PB13, PB14, or PB15 of the MCU output a high level, the corresponding transistor conducts, the common terminal of the digital tube is connected to the power supply VDD, and the digital tube is lit. MCU pins PD2, PD3, PD4, PD5, PD6, PD7, PD8, and PD9 are used to control the segments of the digital tube. Figure 5 In the diagram, segments A through H are illuminated when the MCU pins output a high level. (Refer to...) Figure 11 LED8 in the figure is an RGB LED, which contains red, green and blue LEDs. The MCU controls the red, green and blue LEDs through the PB1, PB0 and PA6 pins respectively. Figure 11 RN6 in the diagram is a current-limiting resistor. This resistor limits the current flowing through the LED to prevent overcurrent damage. (See reference...) Figure 12 In the diagram, BUZZER1 is a buzzer, and Q2 is an NPN transistor. The MCU's PC5 pin controls the buzzer's on / off state by controlling the base level of the NPN transistor.

[0049] In some implementations, the STM32 series MCU is specifically the STM32F411RET6 MCU.

[0050] Reference Figure 10 In the diagram, U7 is the MCU. The STM32F411RET6 is a high-performance microcontroller in the STM32 series, with rich peripherals and functions, and is suitable for embedded applications.

[0051] Preferably, the button input module 310 includes a button, a capacitor, and a pull-up resistor, and the button is electrically connected to the GPIO pin of the MCU.

[0052] Reference Figure 15 In the diagram, P2, P3, P4, P5, P6, and P7 are buttons used to trigger input signals. One end of each button is connected to the MCU's GPIO pin via a capacitor and a pull-up resistor. Buttons P2-P7 are located on the top surface of housing 1. Figure 1Buttons P2-P7 correspond to buttons KEY0-KEY5 respectively. Figure 15 C27-C31 in the diagram are capacitors used for debouncing and ensuring the stability of the input signal. Figure 15 RN1 and RN2 are pull-up resistors. When the button is not pressed, the pull-up resistors are used to ensure that the GPIO pin is in a high-level state.

[0053] The key input module also includes a BOOT0 key, a SWITCH key, and a RESET key, see reference. Figure 21 The BOOT0, SWITCH, and RESET buttons are all located on the side of housing 1. (See reference...) Figure 15 The selection circuit connected to the BOOT0 button includes capacitor C32, one end of which is connected to the BOOT0 pin of the MCU. The BOOT0 button is used to select the MCU's startup mode. The integrated circuit U14 connected to the SWITCH button has three pins, which are connected to the MCU's PWM, CHANGE, and NET pins respectively. The SWITCH button is used to control the MCU's PWM output, status change detection, and network interface. The reset circuit connected to the RESET button includes a reset chip RST1, resistor R26, and capacitor C42. The reset chip RST1 is connected to the NRST pin of the MCU, and the reset circuit is used to generate a reset signal.

[0054] Preferably, the circuit board 3 also includes an LED module 311, which includes LEDs electrically connected to the GPIO pins of the MCU.

[0055] Reference Figure 16 , Figure 16 LED0, LED1, LED2 and LED3 are LED lights. LED0, LED1, LED2 and LED3 are connected to the P10, P11, P12 and P13 pins of the MCU respectively. The MCU is used to control the on and off states of the LED lights.

[0056] Preferably, an STM32 electronic technology experimental box with splash-proof design also includes a sliding rheostat. The fixed end of the sliding rheostat is electrically connected to the power module 2, and the sliding end of the sliding rheostat is electrically connected to the MCU through a voltage divider resistor. An adjustment knob 4 is provided on one side of the sliding rheostat, and a hole is provided on the side of the housing 1. The adjustment knob 4 passes through the hole and is exposed outside the housing 1.

[0057] Reference Figure 17 , Figure 17U15 in the diagram is a sliding rheostat. The sliding terminal of the rheostat is connected to the PC3 pin of the MCU through a voltage divider resistor R63. When the sliding terminal moves, the voltage at the sliding terminal changes accordingly. The MCU reads the voltage at the sliding terminal through the GPIO pin, thereby obtaining the current resistance value of the rheostat. (Refer to...) Figure 18 The adjustment knob 4 is located on the side of the housing 1, which facilitates the adjustment of the sliding rheostat.

[0058] In some embodiments, the top surface of the housing 1 is provided with an opening 11, a transparent plate is provided above the opening 11, the circuit board 3 is located below the opening 11, the side of the housing 1 is provided with a USB port 12, and the power module 2 includes a three-pronged power interface 21 and a power switch 22 provided on the side of the housing 1.

[0059] Reference Figure 1 By providing a transparent plate through opening 11, users can visually observe the status and displayed information of the internal circuit board 3; furthermore, the transparent plate serves a waterproof function. (Refer to...) Figures 19-20 The USB port 12, the three-prong power interface 21, and the power switch 22 are located on the side of the housing 1 to prevent the connecting cable from obstructing the operation of the circuit board 3 located on the top surface of the housing 1.

[0060] This invention relates to a box-type electronic experimental device designed to protect against accidental liquid splashes during experiments. This experimental box not only allows researchers to easily perform various manual operations for debugging and control of the experimental equipment, but also enables them to directly observe the experimental process and results. Simultaneously, it protects the equipment from damage caused by liquid splashes and prevents the circuit boards from being corroded by sweat residue from human operation. This invention abandons the existing openable box structure and adopts a fully enclosed box structure, ensuring that routine operations by researchers do not involve contact with the internal metal circuitry.

[0061] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A splash-proof STM32 electronic technology experimental box, comprising a sealed shell and a power module and circuit board disposed inside the shell, characterized in that: The circuit board is arranged in a grid-like modular layout, including a digital tube module, a USB to TTL serial port module, a photosensitive sensor module, a first display screen module, an STLINK debugging module, an MCU minimum system module, an RGB light module, a buzzer module, a second display screen module, a temperature sensor module, and a key input module. Each module is electrically connected to the MCU minimum system module via the circuit board. The power supply module is electrically connected to the circuit board and is used to control the on / off of the power supply to the STM32 electronic experimental box and to convert the external input voltage into the power supply voltage for each module. The MCU minimum system module includes a crystal oscillator circuit and an STM32 series MCU.

2. The STM32 electronic technology experimental box with splash-proof design according to claim 1, characterized in that: The USB to TTL serial port module includes a CH340N chip, and the STLINK debug interface module includes an STLINK debug interface for connecting external debug tools and the MCU.

3. The STM32 electronic technology experimental box with splash-proof design according to claim 1, characterized in that: The photosensitive sensor module includes a photoresistor of model GL5516, and the temperature sensor module includes a temperature sensor of model LM75.

4. The STM32 electronic technology experimental box with splash-proof design according to claim 1, characterized in that: The first display module includes an LCD screen, which is electrically connected to the MCU minimum system module via a 4-pin connector. The second display module includes an OLED screen that is electrically connected to the MCU minimum system module.

5. The STM32 electronic technology experimental box with splash-proof design according to claim 1, characterized in that: The digital tube module includes a digital tube; the RGB lamp module includes RGB LEDs and a current-limiting resistor; the buzzer module includes a buzzer and an NPN transistor for driving the buzzer.

6. The STM32 electronic technology experimental box with splash-proof design according to claim 1, characterized in that: The STM32 series MCU specifically refers to the STM32F411RET6 MCU.

7. The STM32 electronic technology experimental box with splash-proof design according to claim 6, characterized in that: The button input module includes buttons, capacitors, and pull-up resistors, and the buttons are electrically connected to the GPIO pins of the MCU.

8. The STM32 electronic technology experimental box with splash-proof design according to claim 6, characterized in that: The circuit board also includes an LED module, which includes LEDs electrically connected to the GPIO pins of the MCU.

9. The STM32 electronic technology experimental box with splash-proof design according to claim 6, characterized in that: It also includes a sliding rheostat, the fixed end of which is electrically connected to the power module, and the sliding end of which is electrically connected to the MCU through a voltage divider resistor. An adjustment knob is provided on one side of the sliding rheostat, and a hole is provided on the side of the housing, through which the adjustment knob is exposed outside the housing.

10. The STM32 electronic technology experimental box with splash-proof design according to claim 1, characterized in that: The top surface of the housing has an opening, a transparent plate is provided above the opening, the circuit board is located below the opening, the side of the housing has a USB port, and the power module includes a three-prong power interface and a power switch located on the side of the housing.

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