Quality control sound level meter

Abstract

The utility model relates to a quality control sound level meter, and particularly discloses a quality control sound level meter, which comprises a host, a PCB (printed circuit board) is arranged in the host, a first plug connector J1 is integrated on the PCB, and a storage module is fixedly mounted on the host; the storage module is in data connection with a corresponding pin SPI1SCK, a corresponding pin SPI1MISO and a corresponding pin SPI1MOSI on the first plug connector J1; a pin 7 and a pin 8 of the storage module are connected in parallel with a ground wire, and the ground wire is connected in series with a first capacitor C1; a pin 3 and a pin 4 of the storage module are connected with a power supply circuit formed by connecting a + 3.3 VBAT circuit and a BK circuit in parallel, and the + 3.3 VBAT circuit is connected with a disposable fuse F1 and a first resistor R1 in series and is connected with a second capacitor C2 in parallel. According to the invention, the read-write requirement of the storage module is met, and the memory requirement in the running process of the equipment is ensured.

Description

Technical Field

[0001] The utility model relates to a quality control sound level meter, in particular to a quality control sound level meter. Background Art

[0002] Traditional sound level meters store measurement data either in an internal memory chip or on a TF card. These data can be modified or deleted, which could compromise the validity of the data. Therefore, a sound level meter must be designed to prevent data from being altered. If the memory chip were built into the instrument, the instrument would become unusable once the memory card was full. Therefore, designing the instrument's memory to ensure data storage without modification and to allow for replacement of the memory card once full became crucial. Utility Model Content

[0003] The purpose of the utility model is to provide a quality control sound level meter for solving the above problems.

[0004] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a quality control sound level meter, comprising a host, wherein a PCB board is provided in the host, a first plug connector J1 is integrated on the PCB board, and a storage module is fixedly installed on the host;

[0005] The storage module includes a U1 chip;

[0006] The U1 chip is data-connected to the corresponding pins SPI1_SCK, SPI1_MISO, and SPI1_MOSI on the first plug connector J1;

[0007] A ground line is connected in parallel to pins 7 and 8 of the U1 chip, and a first capacitor C1 is connected in series to the ground line;

[0008] Pins 3 and 4 of the U1 chip are connected to a power supply circuit consisting of a +3.3V_BAT circuit and a BK circuit in parallel, wherein:

[0009] The +3.3V_BAT line is connected in series with a one-time fuse F1 and a first resistor R1, and in parallel with a second capacitor C2;

[0010] The BK line is connected in parallel with a MOS transistor Q1 , a second resistor R2 , and a third resistor R3 .

[0011] Preferably, a tube body is provided on one side of the host, a preamplifier U3A is placed in the tube body, and a microphone is fixedly installed on the port of the tube body;

[0012] The PCB board is integrated with a single chip microcomputer, a display, an analog-to-digital converter ADC and a button DOWN1;

[0013] The output data of the microphone is sequentially transmitted to the single chip microcomputer by the preamplifier U3A and the analog-to-digital converter ADC;

[0014] The display is used to display the output data of the single chip microcomputer.

[0015] Preferably, it further includes a wind shield covering the tube port to cover the microphone.

[0016] Preferably, an eighteenth capacitor C18 is connected in series to the wire connecting the data pin 3 of the preamplifier and the pin 3 of the microphone.

[0017] Preferably, pin 1 of the preamplifier U3A is connected to pin VINL of the analog-to-digital converter ADC.

[0018] Preferably, the pins ADCRES, BCLK, MCLK, WCLK and D pin OUT of the analog-to-digital converter ADC are all connected to the input end of the single chip microcomputer.

[0019] Preferably, OLED_CS, RES, SA0, OLED_CLK and OLED_MOSI of the display are all connected to the input end of the single chip microcomputer.

[0020] As an example, the pins KEYIN0, KEYIN1, KEYIN2, KEYIN3, KEYIN4 and KEYIN5 of the button DOWN1 are all connected to the input terminal of the microcontroller.

[0021] Preferably, a second plug connector J2 is integrated on the PCB board, and the plug connector J2 is data-connected to the corresponding pins SPI1_SCK, SPI1_MISO and SPI1_MOSI on the U1 chip.

[0022] Preferably, a third plug connector J3 is integrated on the PCB board, and pins of the third plug connector J3 and the second plug connector J2 are zero-connected.

[0023] In the above technical solution, the quality control sound level meter provided by the present invention has the following beneficial effects: when the storage module is inserted and operated, the second capacitor is charged, BK is at a high level, at this time the Q1 MOS tube is disconnected, and pin 3 (write protection) of the storage module is at a high level (writable), and the storage module can be read and written at will.

[0024] When the storage module is full and needs to be replaced, remove the storage module. At this time, the +3.3V_BAT and BK pins are disconnected from the instrument, the MOS tube is turned on, and the second capacitor is discharged to the ground through the one-time fuse F1. The fuse blows, and pin 3 of the storage module is permanently grounded (write protection is turned on). At this time, the content of the storage module can no longer be modified. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0026] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present utility model;

[0027] Figure 2 Schematic diagram provided for an embodiment of the present utility model;

[0028] Figure 3 A circuit diagram of a preamplifier provided in an embodiment of the present utility model;

[0029] Figure 4 The circuit of the analog-to-digital converter provided by the embodiment of the utility model;

[0030] Figure 5 A circuit diagram of a display screen provided in an embodiment of the present utility model;

[0031] Figure 6 A circuit diagram of a key provided in an embodiment of the present utility model;

[0032] Figure 7 A circuit diagram of a storage module interface provided by an embodiment of the present utility model;

[0033] Figure 8 This is a circuit diagram of a storage module provided in an embodiment of the present utility model.

[0034] Description of reference numerals:

[0035] 1. Host; 3. Microphone; 4. Wind shield; 5. Storage module; 6. Display. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] like Figure 1-8As shown, a quality control sound level meter includes a host 1, a PCB board is provided in the host 1, a first plug connector J1 is integrated on the PCB board, a storage module 5 is fixedly installed on the host 1, and the storage module 5 includes a U1 chip;

[0038] like Figure 8 As shown, the U1 chip is data-connected to the corresponding pins SPI1_SCK, SPI1_MISO, and SPI1_MOSI on the first plug connector J1, and the first plug connector J1 provides a +3.3V power input for the operation of the U1 chip;

[0039] A ground line is connected in parallel to pins 7 and 8 of the U1 chip, and a first capacitor C1 is connected in series to the ground line;

[0040] Pins 3 and 4 of the U1 chip are connected to a power supply circuit consisting of a +3.3V_BAT circuit and a BK circuit in parallel.

[0041] The +3.3V_BAT line is connected in series with a one-time fuse F1 and a first resistor R1, and in parallel with a second capacitor C2;

[0042] The BK line is connected in parallel with a MOS transistor Q1 , a second resistor R2 , and a third resistor R3 .

[0043] When the storage module 5 is plugged in and running, the second capacitor C2 is charged, BK is at a high level, and the Q1 MOS tube is disconnected. The pin 3 (write protection) of the storage module 5 is at a high level (writable), and the storage module 5 can be read and written at will.

[0044] When storage module 5 is full and needs to be replaced, remove storage module 5. At this time, the +3.3V_BAT and BK pins are disconnected from the instrument, the Q1 MOS tube is turned on, and the supercapacitor C2 is discharged to the ground through the one-time fuse F1. The fuse blows, and pin 3 of storage module 5 is permanently grounded (write protection is on). At this time, the content of storage module 5 can no longer be modified.

[0045] And combined Figure 7 and Figure 7 The PCB board integrates a second plug connector J2, which is connected to the corresponding pins SPI1_SCK, SPI1_MISO, and SPI1_MOSI on the U1 chip. Furthermore, the PCB board integrates a third plug connector J3, which is connected to the pin zero of the second plug connector J2.

[0046] The second plug connector J2 is connected to the storage module 5. +3.3V is generated when the instrument starts up, charging the button battery in the third plug connector J3 and simultaneously powering the storage module 5. SPI1_SCK, SPI1_MISO, and SPI1_MOSI are data communication lines that connect to the microcontroller and are used to read and write to the storage module 5. VBAT provides long-term power to the write-protected portion of the storage module 5.

[0047] Further, combined Figure 1 and Figure 2 As shown, a tube body is provided on one side of the host 1, a preamplifier U3A is placed in the tube body, and a microphone 3 is fixedly installed on the end of the tube body;

[0048] The PCB board integrates a single chip microcomputer, a display 6, an analog-to-digital converter ADC and a button DOWN1;

[0049] The output data of microphone 3 is transmitted to the microcontroller via preamplifier U3A and analog-to-digital converter ADC in turn;

[0050] The display 6 is used to display the output data of the single chip microcomputer.

[0051] A wind shield 4 is provided at the end of the tube body to cover the microphone 3 .

[0052] Specifically, windshield 4 reduces wind interference with the sound level meter's measurements while protecting microphone 3. Microphone 3 converts acoustic signals into electrical signals. Preamplifier U3A matches the impedance of microphone 3 to the input of host 1. The microcontroller calculates the collected signal and displays the noise index. Host 1 saves the measurement results to storage module 5. Once storage module 5 is disconnected from host 1 and then removed, its write function is lost. From then on, measurement data can only be read but not modified, ensuring data legitimacy.

[0053] The detailed data processing flow is as follows: after the signal output by microphone 3 comes in, the preamplifier U3A op amp amplifies the signal so that even very small noise can be measured. The analog-to-digital converter ADC converts the analog signal input by the preamplifier U3A op amp into a digital signal and sends it to the microcontroller through the I2S bus. The microcontroller displays the calculated data on the screen through the SPI bus.

[0054] The button DOWN1 receives the user's input and transmits it to the single chip microcomputer through the IO interface, so as to browse the data stored in the storage module 5, start the microphone 3 to collect signals, turn on and off the machine, and other operations.

[0055] The single chip microcomputer writes data into the storage module 5 for storage via the SPI signal interface.

[0056] As an embodiment further provided by the present invention, Figure 3It can be seen that the wire connecting the data pin 3 of the preamplifier and the pin 3 of the microphone 3 is connected in series with the eighteenth capacitor C18. The pin 1 of the preamplifier U3A is connected to the pin VINL of the analog-to-digital converter ADC.

[0057] Specifically, the signal collected by the microphone 3 is input to the preamplifier through the second plug connector J2, and then output to the analog-to-digital converter ADC through the VINL.

[0058] As another embodiment further provided by the present invention, Figure 4 It can be seen that the ADCRES pin, BCLK pin, MCLK pin, WCLK pin, and OUT pin of the analog-to-digital converter ADC are all connected to the input end of the microcontroller.

[0059] As another embodiment further provided by the present invention, Figure 5 It can be seen that OLED_CS, RES, SA0, OLED_CLK, and OLED_MOSI of the display 6 are all connected to the input terminals of the single chip microcomputer.

[0060] As another embodiment further provided by the present invention, Figure 6 It can be seen that the pins KEYIN0, KEYIN1, KEYIN2, KEYIN3, KEYIN4 and KEYIN5 of the key DOWN1 are all connected to the input terminals of the microcontroller.

[0061] It should be noted that the device is powered by a rechargeable battery built into the host 1, and the rechargeable battery can be directly connected to the 220V mains power supply via a charger. The above control program and electronic components are all common technical knowledge of those skilled in the art and will not be disclosed in detail.

[0062] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A quality control sound level meter, characterized in that: The host (1) comprises a PCB board provided therein, a first plug connector J1 being integrated on the PCB board, and a storage module (5) being fixedly mounted on the host (1); The storage module (5) includes a U1 chip; The U1 chip is data-connected to the corresponding pins SPI1_SCK, SPI1_MISO, and SPI1_MOSI on the first plug connector J1; A ground line is connected in parallel to pins 7 and 8 of the U1 chip, and a first capacitor C1 is connected in series to the ground line; Pins 3 and 4 of the U1 chip are connected to a power supply circuit consisting of a +3.3V_BAT circuit and a BK circuit in parallel, wherein: The +3.3V_BAT line is connected in series with a one-time fuse F1 and a first resistor R1, and in parallel with a second capacitor C2; The BK line is connected in parallel with a MOS transistor Q1 , a second resistor R2 , and a third resistor R3 .

2. A quality control sound level meter according to claim 1, characterized in that: A tube body is provided on one side of the host (1), a preamplifier U3A is placed in the tube body, and a microphone (3) is fixedly mounted on the end of the tube body; The PCB board is integrated with a single chip microcomputer, a display (6), an analog-to-digital converter ADC and a button DOWN1; The output data of the microphone (3) is sequentially transmitted to the single chip microcomputer via the preamplifier U3A and the analog-to-digital converter ADC; The display (6) is used to display the output data of the single chip microcomputer.

3. A quality control sound level meter according to claim 2, characterized in that: It also includes a wind shield (4) covering the end of the tube body to cover the microphone (3).

4. A quality control sound level meter according to claim 2, characterized in that: An eighteenth capacitor C18 is connected in series to the wire connecting the data pin 3 of the preamplifier and the pin 3 of the microphone (3).

5. A quality control sound level meter according to claim 2, characterized in that: Pin 1 of the preamplifier U3A is connected to pin VINL of the analog-to-digital converter ADC.

6. A quality control sound level meter according to claim 2, characterized in that: The pins ADCRES, BCLK, MCLK, WCLK and OUT of the analog-to-digital converter ADC are all connected to the input end of the single chip microcomputer.

7. A quality control sound level meter according to claim 2, characterized in that: The OLED_CS, RES, SA0, OLED_CLK, and OLED_MOSI of the display (6) are all connected to the input end of the single chip microcomputer.

8. The quality control sound level meter according to claim 2, characterized in that: The pins KEYIN0, KEYIN1, KEYIN2, KEYIN3, KEYIN4 and KEYIN5 of the key DOWN1 are all connected to the input end of the single chip microcomputer.

9. The quality control sound level meter according to claim 1, characterized in that: A second plug connector J2 is integrated on the PCB board, and the plug connector J2 is data-connected to the corresponding pins SPI1_SCK, SPI1_MISO, and SPI1_MOSI on the U1 chip.

10. The quality control sound level meter according to claim 9, characterized in that: A third plug connector J3 is integrated on the PCB board, and pins of the third plug connector J3 and the second plug connector J2 are zero-connected.

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