Bluetooth DMM using HID protocol for transmission

Abstract

The utility model relates to the technical field of electronic measurement, in particular to a Bluetooth DMM using an HID protocol for transmission, which comprises a Bluetooth equipment main body, a main circuit board, a display screen and an interface terminal, a main control MCU and a Bluetooth DMM module are integrated on the main circuit board, and the main control MCU is in communication connection with the Bluetooth DMM module; the master control MCU is connected with an analog-to-digital conversion circuit and a measurement circuit, and the Bluetooth DMM module is configured as an HID device and is connected with a computer in a wireless mode. Different from other Bluetooth products which use special APPs to complete display and need to develop the APPs, users need to download and install the APPs, the operation is very troublesome, and some compatibility problems are caused by upgrading, the Bluetooth DMM module can complete communication with a computer with the lowest cost, the universality is very high, and the application range is wide. Generally, data transmission can be realized by using the Bluetooth DMM module in occasions where information can be input by using a keyboard.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bluetooth DMM, in particular to a bluetooth DMM with HID protocol transmission belongs to electronic measurement technical field. BACKGROUND

[0002] The conventional bluetooth digital multimeter usually needs to carry out data interaction with computer or mobile device through special APP, and this mode has the following shortcomings:

[0003] The user needs to download and install the special APP additionally, and the operation is cumbersome;

[0004] The APP may have compatibility problems, especially after system upgrade;

[0005] The development and maintenance of the special APP increase the cost;

[0006] In the prior art, there is no scheme for realizing bluetooth digital multimeter data transmission by using HID protocol, and the HID protocol is usually used for keyboard, mouse and other input devices, and its advantage lies in that it can be directly recognized and used by the operating system without installing the driver or special software.

[0007] Therefore, it is urgent to improve the bluetooth DMM with HID protocol transmission to solve the above problems. CONTENT OF UTILITY MODEL

[0008] The utility model aims at providing a bluetooth DMM with HID protocol transmission, which is different from other bluetooth products using special APP to complete display, and needs to develop the APP, so that the user needs to download and install, and the operation is very troublesome, and there are some compatibility problems caused by upgrade, the bluetooth DMM module can complete communication with the computer with the least cost, and the universality is very high, and the bluetooth DMM module can realize data transmission in the occasion that the information can be input by using the keyboard.

[0009] In order to achieve the above purpose, the main technical scheme of the utility model comprises:

[0010] A bluetooth DMM with HID protocol transmission, including bluetooth device main body and main circuit board, display screen and interface terminal fixedly arranged in the bluetooth device main body, the main circuit board is integrated with main control MCU and bluetooth DMM module, the main control MCU and the bluetooth DMM module establish communication connection;

[0011] The main control MCU is connected with analog-digital conversion circuit and measurement circuit, the bluetooth DMM module is configured as HID device, and is connected with computer in a wireless mode;

[0012] The Bluetooth DMM module comprises a chip K2, a series connection of a triode Q1 and a triode Q2 is electrically connected to a VCC pin of the chip K2, and a resistor R1 is electrically connected between the triode Q1 and the triode Q2.

[0013] Preferably, the master MCU supports at least one of voltage, current and resistance measurement functions, and the display screen is in communication connection with the master MCU.

[0014] Preferably, the Bluetooth DMM module is a low-power Bluetooth BLE module and is compatible with a HID over GATT protocol.

[0015] Preferably, the HID device comprises at least one of a number, a unit symbol and a line feed symbol and is in communication connection with the master MCU.

[0016] Preferably, the computer is any one of a Windows, macOS or Linux system device supporting the HID protocol.

[0017] Preferably, an operational amplifier U1 and a chip U2 are arranged on the analog-digital conversion circuit, a capacitor C1, a resistor R4, a switch S3 and a switch S4 are electrically connected between the operational amplifier U1 and the chip U2, and the operational amplifier U1 is electrically connected with the switch S1 and the switch S2 away from the chip U2.

[0018] Preferably, the operational amplifier U1 is of a model MCP6001, and the switches S1 to S4 are of a model 74HC4066N.

[0019] Preferably, the measurement circuit comprises a series connection of a variable resistor R0 and an ammeter, and the variable resistor R0 is parallelly connected with resistors R1 to R5.

[0020] The utility model at least has the following beneficial effects:

[0021] Unlike other Bluetooth products, a special APP is used to complete display, and the APP needs to be developed, which needs to be downloaded and installed by the user, and it is very troublesome to operate, and some compatibility problems are caused by upgrading, the Bluetooth DMM module uses the HID protocol transmission, and the user uses it conveniently, and the trouble of installing the APP is saved, any editing software is opened, and the measurement data can be transmitted to the cursor position, which is convenient and fast, and the universality is very high, and the Bluetooth can be used in any occasion where the information can be input by using the keyboard. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application, and do not limit the application. In the drawings:

[0023] Figure 1 An electrical schematic diagram of the utility model;

[0024] Figure 2 A Bluetooth DMM module circuit diagram of the utility model;

[0025] Figure 3 An analog-digital conversion circuit diagram of the utility model;

[0026] Figure 4 A measurement circuit diagram of the utility model.

[0027] In the drawings, 1, a Bluetooth device main body; 2, a main circuit board; 3, a display screen; 4, an interface terminal; 5, a main control MCU; 501, an analog-digital conversion circuit; 502, a measurement circuit; 6, a Bluetooth DMM module; 7, a computer. DETAILED DESCRIPTION

[0028] The embodiments of the application will be described in detail below with the accompanying drawings and embodiments, so that the realization process of how the application applies technical means to solve technical problems and achieves technical effects can be fully understood and implemented.

[0029] As Figures 1-4 shown, the Bluetooth DMM transmitted by the HID protocol provided by the embodiment includes a Bluetooth device main body 1, a main circuit board 2, a display screen 3 and an interface terminal 4 fixedly arranged inside the Bluetooth device main body 1, the main circuit board 2 is integrated with a main control MCU 5 and a Bluetooth DMM module 6, and the main control MCU 5 and the Bluetooth DMM module 6 are in communication connection;

[0030] The main control MCU 5 is connected with an analog-digital conversion circuit 501 and a measurement circuit 502, the Bluetooth DMM module 6 is configured as an HID device, and is connected with a computer 7 in a wireless mode, the main control MCU 5 supports at least one of voltage, current and resistance measurement functions, and the display screen 3 is in communication connection with the main control MCU 5, the main control MCU 5 is responsible for completing data acquisition of various gears, displaying through the display screen 3, and then giving the Bluetooth DMM module 6 with the displayed data through a serial port, the Bluetooth DMM module 6 is a low-power Bluetooth BLE module, compatible with an HID over GATT protocol, the Bluetooth DMM module 6 completes data transmission with the computer 7 in an HID protocol through a wireless link, the computer 7 is any one of Windows, macOS or Linux system devices supporting the HID protocol, and the computer 7 can display received data at a cursor position in an editing software, the Bluetooth DMM module 6 is cleverly applied to the HID protocol, the HID device includes at least one of a number, a unit symbol and a line feed symbol, and is in communication connection with the main control MCU 5, unlike other Bluetooth products using a special APP to complete display, which needs to develop the APP, so that users need to download and install, and it is very troublesome to operate, and there are some compatibility problems caused by upgrading, the Bluetooth DMM module 6 can complete communication with the computer at the lowest cost, and has very high universality, and can be used to realize data transmission in any occasion where information can be input by using a keyboard.

[0031] The Bluetooth DMM module 6 includes a chip K2, a triode Q1 and a triode Q2 are electrically connected in series to a VCC pin of the chip K2, and the triode Q1 and the triode Q2 are electrically connected with a resistor R1, the Bluetooth DMM module 6 using the HID protocol for transmission does not need a special APP, so that the user uses it more conveniently, and the trouble of installing the APP is saved, and measurement data can be transmitted to a cursor position by opening any editing software, which is convenient and fast.

[0032] Further, as Figure 3As shown, the analog-to-digital conversion circuit 501 is provided with an operational amplifier U1 and a chip U2, and the operational amplifier U1 and the chip U2 are electrically connected with a capacitor C1, a resistor R4, and switches S3 and S4, and the end of the operational amplifier U1 away from the chip U2 is electrically connected with switches S1 and S2, the model of the operational amplifier U1 is MCP6001, the models of the switches S1 to S4 are 74HC4066N, there are two input voltages connected to the operational amplifier U1, one at a time, Vref is a fixed reference voltage used in calibration, and Vmeas is an unknown voltage to be converted, the resistor R1 and the capacitor C1 constitute a charging circuit, which can be used to convert the input voltage into time, and the presence of the operational amplifier U1 in the circuit can eliminate the logarithmic characteristics generated when the input voltage is directly applied to R1 and C1.

[0033] Further, as shown in Figure 4 The measurement circuit 502 includes a rheostat R0 and an ammeter arranged in series, and the rheostat R0 is connected in parallel with resistors R1 to R5, which is a closed-loop tap shunt circuit, and the circuit is as shown in Figure 4 As shown in the figure, R1 to R5 are collectively referred to as total shunt resistance RS, and in actual products, in order to facilitate adjustment and batch production, the total shunt resistance RS mostly adopts a larger integer kilo-ohm resistance value, and a variable wire resistance R0 is further connected in series on the meter head, so that when the parameters of the meter head change, compensation and adjustment can still be obtained.

[0034] As shown in Figures 1-4 The principle of the Bluetooth DMM provided by the embodiment for transmitting by using the HID protocol is as follows:

[0035] The display screen 3 is in communication connection with the master control MCU 5, the master control MCU 5 is responsible for completing data acquisition of each gear, displaying through the display screen 3, and then giving the Bluetooth DMM module 6 through a serial port, the Bluetooth DMM module 6 is a low-power Bluetooth BLE module, compatible with the HID over GATT protocol, the Bluetooth DMM module 6 further completes data transmission with the computer 7 by using the HID protocol through a wireless link, the computer 7 is any one of Windows, macOS or Linux system supporting the HID protocol, and the computer 7 can display the received data at the cursor position in the editing software, the core of the Bluetooth DMM module 6 is the ingenious application of the HID protocol, the HID device includes at least one of a number, a unit symbol and a line feed symbol, and is in communication connection with the master control MCU 5, which is different from other Bluetooth products using a special APP to complete display, and needs to develop the APP, so that the user needs to download and install, which is very troublesome to operate, and there are some compatibility problems caused by upgrading, the Bluetooth DMM module 6 can complete communication with the computer at the lowest cost, and has very high universality, and can be used to realize data transmission in any occasion where information can be input by using a keyboard.

[0036] The Bluetooth DMM module 6 comprises a chip K2, a transistor Q1 and a transistor Q2 are electrically connected in series on the VCC pin of the chip K2, and the transistor Q1 and the transistor Q2 are electrically connected with a resistor R1, the Bluetooth DMM module 6 transmitted by using the HID protocol does not need a special APP, so that the user uses it more conveniently, and the trouble of installing the APP is saved, and the measurement data can be transmitted to the cursor position by opening any editing software, which is convenient and fast.

[0037] As some terms are used in the description and claims, those skilled in the art can understand that the same components can be referred to by different names by hardware manufacturers. The description and claims of the present specification do not distinguish components by name differences, but by functional differences. As mentioned throughout the description and claims, "comprising" is an open term, which should be interpreted as "including but not limited to". "Substantially" means within an acceptable error range, and those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0038] It should be noted that the terms "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the goods or system comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such goods or system. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of another identical element in the goods or system comprising the element.

[0039] The above description shows and describes several preferred embodiments of the present application, but as mentioned above, the present application is not limited to the forms disclosed herein, and should not be considered as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified by the above teachings or related art or knowledge within the scope of the application. The modifications and changes made by those skilled in the art without departing from the spirit and scope of the present application shall be within the scope of protection of the appended claims of the present application.

Claims

1. A Bluetooth DMM transmitted with HID protocol, comprising a Bluetooth device body (1) and a main circuit board (2), a display screen (3) and an interface terminal (4) fixedly arranged inside the Bluetooth device body (1), characterized in that, The main circuit board (2) is integrated with a main control MCU (5) and a Bluetooth DMM module (6), the main control MCU (5) is connected with the Bluetooth DMM module (6) to establish a communication connection; The main control MCU (5) is connected with an analog-digital conversion circuit (501) and a measurement circuit (502), the Bluetooth DMM module (6) is configured as an HID device, and is connected with a computer (7) in a wireless mode; The Bluetooth DMM module (6) comprises a chip K2, the VCC pin of the chip K2 is electrically connected with a series connection of a triode Q1 and a triode Q2, and the triode Q1 and the triode Q2 are electrically connected with a resistor R1.

2. The Bluetooth DMM transmitted with HID protocol according to claim 1, characterized in that: The main control MCU (5) supports at least one of voltage, current and resistance measurement functions, and the display screen (3) is connected with the main control MCU (5) to establish a communication connection.

3. The Bluetooth DMM transmitted with HID protocol according to claim 1, characterized in that: The Bluetooth DMM module (6) is a low-power Bluetooth BLE module, and is compatible with an HID over GATT protocol.

4. The Bluetooth DMM transmitting with HID protocol according to claim 1, characterized in that: The HID device comprises at least one of a digit, a unit symbol and a line feed symbol, and is connected with the main control MCU (5) to establish a communication connection.

5. The Bluetooth DMM transmitting with HID protocol according to claim 1, characterized in that: The computer (7) is any one of a Windows, macOS or Linux system device supporting an HID protocol.

6. The Bluetooth DMM transmitting with HID protocol according to claim 1, characterized in that: The analog-digital conversion circuit (501) is provided with an operational amplifier U1 and a chip U2, the operational amplifier U1 and the chip U2 are electrically connected with a capacitor C1, a resistor R4, a switch S3 and a switch S4, and the operational amplifier U1 is electrically connected with a switch S1 and a switch S2 away from the chip U2.

7. The Bluetooth DMM transmitted with HID protocol according to claim 6, characterized in that: The model of the operational amplifier U1 is MCP6001, and the models of the switches S1-S4 are 74HC4066N.

8. The Bluetooth DMM transmitting with HID protocol according to claim 1, characterized in that: The measurement circuit (502) comprises a series connection of a variable resistor R0 and an ammeter, and the variable resistor R0 is provided with resistors R1-R5 in parallel.

Images