CN213780205U - Micro-current measuring device - Google Patents
Micro-current measuring device Download PDFInfo
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- CN213780205U CN213780205U CN202022450979.6U CN202022450979U CN213780205U CN 213780205 U CN213780205 U CN 213780205U CN 202022450979 U CN202022450979 U CN 202022450979U CN 213780205 U CN213780205 U CN 213780205U
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Abstract
The utility model relates to a micro-current measuring device, which comprises a power circuit, an I-V conversion circuit, a data acquisition circuit and a data processing terminal; the power supply circuit is used for providing working voltage for the I-V conversion circuit and the data acquisition circuit, the I-V conversion circuit is used for converting direct current micro-current into measurable direct current voltage, the data acquisition circuit is used for acquiring the measurable direct current voltage output by the I-V conversion circuit, performing digital-to-analog conversion and acquiring voltage data, the data acquisition circuit is also used for transmitting acquired voltage data signals to the data processing terminal, and the data processing terminal is used for calculating the acquired voltage data signals to obtain the measured micro-current value. The micro-current measuring circuit converts direct current micro-current into measurable direct current voltage through an I-V conversion circuit, converts the measurable direct current voltage into digital-to-analog conversion through a data acquisition circuit, transmits the digital quantity acquired by a single chip microcomputer to a PC (personal computer) through a serial port, and processes the measurable voltage value through the PC to obtain the value of the micro-current.
Description
Technical Field
The utility model relates to a little current measurement technical field of direct current, specific little current measurement device that says so.
Background
With the continuous development of modern electronics and measurement technology, the measurement of micro-currents has become more and more important. Currently, many measurements exchange physical quantities through sensors into weak current signals. The extremely weak current is measured in the application and test of static research, material test, on-line monitoring of power equipment, photoelectric mutual inductor and the like. At present, the micro-current measuring instrument has a complex structure, poor applicability and difficult maintenance.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a little current measurement device, this kind of device can be through I-V converting circuit with direct current little current conversion for measurable direct current voltage, through data acquisition circuit with measurable direct current voltage digital analog conversion, digital quantity after STM32F103C8T6 type singlechip collection conversion, rethread RS232 serial ports are defeated to the PC, handle measurable quantity voltage value through the PC and obtain little current's value.
In order to solve the technical problem, the utility model discloses a technical scheme does:
a micro-current measuring device is characterized in that: the system comprises a power supply circuit, an I-V conversion circuit, a data acquisition circuit and a data processing terminal;
the power supply circuit is used for providing working voltage for the I-V conversion circuit and the data acquisition circuit, the I-V conversion circuit is used for converting direct current micro-current into measurable direct current voltage, the data acquisition circuit is used for acquiring the measurable direct current voltage output by the I-V conversion circuit to perform digital-to-analog conversion and acquire voltage data, the data acquisition circuit is further used for transmitting acquired voltage data signals to the data processing terminal, and the data processing terminal is used for calculating the acquired voltage data signals to acquire measured micro-current values.
The I-V conversion circuit comprises a first integrated operational amplifier circuit and a second integrated operational amplifier circuit, the output end of the first integrated operational amplifier circuit is connected with the input end of the second integrated operational amplifier circuit, the first integrated operational amplifier circuit is a negative feedback amplifier circuit, the second integrated operational amplifier circuit is a reverse follower, the input end of the first integrated operational amplifier circuit is used for collecting micro-current to be detected, the first integrated operational amplifier circuit is used for obtaining a reverse voltage, and the second integrated operational amplifier circuit is used for changing the voltage direction of the reverse voltage and outputting the micro-current.
The first integrated operational amplifier circuit comprises a first TCL2201 chip, and the second integrated operational amplifier circuit comprises a second TCL2201 chip;
the IN-pin of the first TCL2201 chip is connected with one end of a resistor R16, the other end of the resistor R16 is connected with a micro-current input end to be tested, the other end of the resistor R16 is also connected with one end of a resistor R1, the other end of the resistor R1 is connected with the OUT pin of the first TCL2201 chip, the other end of the resistor R16 is also connected with one end of a capacitor C7, the other end of the capacitor C7 is connected with the OUT pin of the first TCL2201 chip, the IN + pin of the first TCL2201 chip is grounded, the positive power pin of the first TCL2201 chip is connected with +5V voltage, the positive power pin of the first TCL2201 chip is connected with one end of a capacitor C8, the other end of the capacitor C8 is grounded, the negative power pin of the first TCL2201 chip is connected with-5V voltage, the negative power pin of the first TCL2201 chip is connected with one end of a capacitor C9, the other end of a capacitor C9 is grounded, the OUT pin of the first TCL2201 chip is connected with one end of a resistor R63, an IN-pin of the second TCL2201 chip is connected with one end of a resistor R12, the other end of the resistor R12 is connected with an OUT pin of the second TCL2201 chip, an IN + pin of the second TCL2201 chip is connected with one end of a resistor R13, and the other end of the resistor R13 is connected with the ground; the positive power supply pin of the second TCL2201 chip is connected with +5V voltage, the positive power supply pin of the second TCL2201 chip is connected with one end of a capacitor C15, the other end of the capacitor C15 is grounded, the negative power supply pin of the second TCL2201 chip is connected with-5V voltage, the negative power supply pin of the second TCL2201 chip is connected with one end of a capacitor C16, the other end of the capacitor C16 is grounded, the OUT pin of the second TCL2201 chip is connected with one end of a resistor R15, and the other end of the resistor R15 is connected with the input end of the data acquisition circuit.
The I-V conversion circuit further comprises a power supply filter circuit and an indicator light circuit, wherein the power supply filter circuit comprises a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5, one end of the capacitor C2 is connected with +5V voltage, the other end of the capacitor C2 is grounded, one end of the capacitor C3 is connected with +5V voltage, and the other end of the capacitor C3 is grounded; one end of a capacitor C4 is connected with-5V voltage, the other end of a capacitor C4 is grounded, one end of a capacitor C5 is connected with-5V voltage, and the other end of a capacitor C5 is grounded;
the indicator lamp circuit include LED lamp D1 and LED lamp D2, LED lamp D1 the anodal and resistance R4 one end be connected, the resistance R4 other end and +5V voltage connection, LED lamp D1's negative pole ground connection, LED lamp D2's anodal and resistance R5 one end be connected, resistance R5 other end ground connection, LED lamp D1's negative pole and-5V voltage connection.
The data acquisition circuit comprises an STM32F103C8T6 type single chip microcomputer and an ADS1115 type AD chip, the ADS1115 type AD chip sends acquired voltage signals to the STM32F103C8T6 type single chip microcomputer after digital-to-analog conversion, and the STM32F103C8T6 type single chip microcomputer transmits decimal voltage values to the PC through an RS232 serial port.
AN AN3 pin of the ADS1115 chip is connected with a No. 1 interface of a socket J4, AN AN2 pin of the ADS1115 chip is connected with a No. 2 interface of a socket J4, AN AN1 pin of the ADS1115 chip is connected with a No. 3 interface of a socket J4, AN AN0 pin of the ADS1115 chip is connected with a No. 4 interface of a socket J4, and a No. 4 interface of the socket J4 is connected with the other end of a resistor R15; the SCL line of the ADS1115 chip is connected with the PB14 pin of the STM32F103C8T6 type single chip microcomputer, the SDA line of the ADS1115 chip is connected with the PB13 pin of the STM32F103C8T6 type single chip microcomputer, the PA9 pin of the STM32F103C8T6 type single chip microcomputer is connected with the T1IN pin of the MAX232 chip, the PA10 pin of the STM32F103C8T6 type single chip microcomputer is connected with the R1OUT pin of the MAX232 chip, and the output end of the MAX232 chip is connected with a PC through an RS232 serial port.
The micro-current measuring device can produce the following beneficial effects: firstly, a silicon gate technology is adopted in an I-V conversion circuit to obtain the stability of input offset voltage; secondly, an STM32F103C8T6 type single chip microcomputer in the data acquisition circuit can directly transmit a decimal voltage value to a PC (personal computer) through a serial port; thirdly, the experimental device analyzes and processes data by means of a PC (personal computer), eliminates system errors and obtains a micro-current value with higher measurement precision.
Drawings
Fig. 1 is a schematic structural diagram of a micro-current measuring device of the present invention.
Fig. 2 is a schematic diagram of an I-V conversion circuit in the micro-current measuring device of the present invention.
Fig. 3 is a schematic circuit diagram of a single chip circuit in a data acquisition circuit of the micro-current measuring device of the present invention.
Fig. 4 is a schematic circuit diagram of a power circuit in a data acquisition circuit of the micro-current measuring device of the present invention.
Fig. 5 is a schematic circuit diagram of an AD conversion circuit in a data acquisition circuit of a micro-current measuring device of the present invention.
Fig. 6 is a schematic circuit diagram of a serial port circuit in a data acquisition circuit of the micro-current measuring device.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments.
In this embodiment, a measurement device for measuring a direct current micro-current in a range of 1nA to 3.3uA is taken as a specific embodiment, and a micro-current measurement device described in this application is described in detail, as shown in fig. 1, and includes a power supply circuit, an I-V conversion circuit, a data acquisition circuit, and a data processing terminal;
the power supply circuit is used for providing working voltage for the I-V conversion circuit and the data acquisition circuit, the I-V conversion circuit is used for converting direct current micro-current into measurable direct current voltage, the data acquisition circuit is used for acquiring the measurable direct current voltage output by the I-V conversion circuit to perform digital-to-analog conversion and acquire voltage data, the data acquisition circuit is further used for transmitting acquired voltage data signals to the data processing terminal, and the data processing terminal is used for processing the acquired voltage data signals and calculating to obtain measured micro-current values.
As shown in fig. 2, the I-V conversion circuit includes a first integrated operational amplifier circuit and a second integrated operational amplifier circuit, the output terminal of the first integrated operational amplifier circuit is connected to the input terminal of the second integrated operational amplifier circuit, the first integrated operational amplifier circuit is a negative feedback amplifier circuit, the second integrated operational amplifier circuit is an inverse follower, the input terminal of the first integrated operational amplifier circuit is used for collecting micro-current to be measured, the first integrated operational amplifier circuit is used for obtaining an inverse voltage, and the second integrated operational amplifier circuit is used for changing the voltage direction of the inverse voltage and outputting the same.
Further, the first integrated operational amplifier circuit comprises a first TCL2201 chip, and the second integrated operational amplifier circuit comprises a second TCL2201 chip; the IN-pin of the first TCL2201 chip is connected with one end of a resistor R16, the other end of the resistor R16 is connected with a micro-current input end to be tested, the other end of the resistor R16 is also connected with one end of a resistor R1, the other end of the resistor R1 is connected with the OUT pin of the first TCL2201 chip, the other end of the resistor R16 is also connected with one end of a capacitor C7, the other end of the capacitor C7 is connected with the OUT pin of the first TCL2201 chip, the IN + pin of the first TCL2201 chip is grounded, the positive power pin of the first TCL2201 chip is connected with +5V voltage, the positive power pin of the first TCL2201 chip is connected with one end of a capacitor C8, the other end of the capacitor C8 is grounded, the negative power pin of the first TCL2201 chip is connected with-5V voltage, the negative power pin of the first TCL2201 chip is connected with one end of a capacitor C9, the other end of a capacitor C9 is grounded, the OUT pin of the first TCL2201 chip is connected with one end of a resistor R11, the other end of the TCL2201 chip is connected with the second pin of the second TCL 11, an IN-pin of the second TCL2201 chip is connected with one end of a resistor R12, the other end of the resistor R12 is connected with an OUT pin of the second TCL2201 chip, an IN + pin of the second TCL2201 chip is connected with one end of a resistor R13, and the other end of the resistor R13 is connected with the ground; the positive power supply pin of the second TCL2201 chip is connected with +5V voltage, the positive power supply pin of the second TCL2201 chip is connected with one end of a capacitor C15, the other end of the capacitor C15 is grounded, the negative power supply pin of the second TCL2201 chip is connected with-5V voltage, the negative power supply pin of the second TCL2201 chip is connected with one end of a capacitor C16, the other end of the capacitor C16 is grounded, the OUT pin of the second TCL2201 chip is connected with one end of a resistor R15, and the other end of the resistor R15 is connected with the input end of the data acquisition circuit.
Furthermore, the I-V conversion circuit also comprises a power supply filter circuit and an indicator light circuit, wherein the power supply filter circuit comprises a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5, one end of the capacitor C2 is connected with +5V voltage, the other end of the capacitor C2 is grounded, one end of the capacitor C3 is connected with +5V voltage, and the other end of the capacitor C3 is grounded; one end of a capacitor C4 is connected with-5V voltage, the other end of a capacitor C4 is grounded, one end of a capacitor C5 is connected with-5V voltage, and the other end of a capacitor C5 is grounded; the indicator lamp circuit include LED lamp D1 and LED lamp D2, LED lamp D1 the anodal and resistance R4 one end be connected, the resistance R4 other end and +5V voltage connection, LED lamp D1's negative pole ground connection, LED lamp D2's anodal and resistance R5 one end be connected, resistance R5 other end ground connection, LED lamp D1's negative pole and-5V voltage connection.
In the embodiment, the I-V conversion circuit is used for converting direct current micro-current with the size of 1 nA-3.3 uA into measurable direct current voltage with the size of 1 mV-3.3V, the direct current micro-current with the size of 1 nA-3.3 uA is input into the I-V conversion circuit from a P3 end, the first-stage integrated operational amplifier circuit U4 is a negative feedback amplifier circuit, and a reverse voltage is obtained after the micro-current is input into the circuit U4; the second stage integrated operational amplifier circuit U5 is an inverting follower, which inverts the output voltage of the circuit U4 without changing its magnitude to obtain a measurable voltage between 1mV and 3.3V, and outputs the voltage through the P4 port of the circuit. The LED lamps D1 and D2 in the indicator light circuit are used as working power indicator lights. C2, C3, C4 and C5 in the power supply filter circuit U7 are used as filter capacitors.
As shown in fig. 3 to 6, the data acquisition circuit includes an STM32F103C8T6 type single chip microcomputer and an ADS1115 type AD chip, the ADS1115 type AD chip performs digital-to-analog conversion on the acquired voltage signal and sends the converted voltage signal to the STM32F103C8T6 type single chip microcomputer, and the STM32F103C8T6 type single chip microcomputer transmits a decimal voltage value to the PC through an RS232 serial port.
Furthermore, AN AN3 pin of the ADS1115 chip is connected with a No. 1 interface of a socket J4, AN AN2 pin of the ADS1115 chip is connected with a No. 2 interface of a socket J4, AN AN1 pin of the ADS1115 chip is connected with a No. 3 interface of a socket J4, AN AN0 pin of the ADS1115 chip is connected with a No. 4 interface of a socket J4, and a No. 4 interface of the socket J4 is connected with the other end of a resistor R15; the SCL line of the ADS1115 chip is connected with the PB14 pin of the STM32F103C8T6 type single chip microcomputer, the SDA line of the ADS1115 chip is connected with the PB13 pin of the STM32F103C8T6 type single chip microcomputer, the PA9 pin of the STM32F103C8T6 type single chip microcomputer is connected with the T1IN pin of the MAX232 chip, the PA10 pin of the STM32F103C8T6 type single chip microcomputer is connected with the R1OUT pin of the MAX232 chip, and the output end of the MAX232 chip is connected with a PC through an RS232 serial port.
In the embodiment, the ADS1115 type AD chip performs digital-to-analog conversion on the measurable voltage with the size of 1 mV-3.3V, and the STM32F103C8T6 type singlechip acquires the converted digital quantity, converts the digital quantity into decimal number and transmits the decimal number to the PC through the RS232 serial port; the PC machine processes the data transmitted by the singlechip to obtain the value of the micro-current.
AN AN0 pin, AN AN1 pin, AN AN2 pin and AN AN3 pin of the ADS1115 type AD chip are input interfaces, the output voltage of a P4 port is connected with AN AN0 pin through a socket J4 and is input into the ADS1115 chip through AN AN0 pin, the voltage generated by R6 voltage division in the graph 5 is connected to AN AN0 test AD input through AN S2 jumper, and S2 is a SW-SPST single-pole single-throw switch. The VDD pin of the ADS1115 chip is connected with one end of an inductor L1, the other end of an inductor L1 is connected with +5V voltage, one end of an inductor L1 is connected with one end of a capacitor C15, the other end of the inductor L1 is connected with one end of a capacitor C16, and the other end of the capacitor C15 and the other end of the capacitor C16 are grounded. The SDA pin of the ADS1115 chip is connected with +5V voltage through a resistor R4, the SCL pin of the ADS1115 chip is connected with +5V voltage through a resistor R3, the RDY pin of the ADS1115 chip is connected with +5V voltage through a resistor R2, and the ADDR pin of the ADS1115 chip is grounded.
The ADS1115 chip is connected with a PB14 pin and a PB13 pin of the STM32F103C8T6 type single chip microcomputer through an SCL line and an SDA line, and digital quantity is transmitted to the STM32F103C8T6 type single chip microcomputer; the circuit connection mode of the STM32F103C8T6 type single chip microcomputer is shown in FIG. 3, and IO of a PA port and IO of a PB port are respectively led out from J5 and J6. The STM32F103C8T6 type single chip microcomputer is connected with an RXD line and a TXD line of the MAX232 chip through an RX line and a TX line; the STM32F103C8T6 model monolith collects the digital quantity and transmits to the MAX232 chip. As shown in FIG. 6, the MAX232 chip converts the digital quantity input from T1IN and T2IN into RS-232 data, and sends the data from T1OUT and T2OUT to the RS232 serial port DB9 plug; RS-232 data of the RS232 serial port DB9 plug are input from R1IN and R2IN, converted into TTL/CMOS data and output from R1OUT and R2OUT to a PC. The PC machine is used for processing the measurable voltage data and calculating the magnitude of the micro-current. The power supply circuit adopts a high-precision low-ripple dual-power module which converts 220V alternating current into +/-5V direct current to provide working voltage for the I-V conversion circuit, and adopts an AMS1117-3.3V chip shown in figure 4 to provide 3.3V working voltage for the singlechip; the AMS1117-5V chip is used for providing working voltage for the MAX232 chip and the ADS1115 chip, an external voltage source inputs 12V working voltage through J1, and then a power supply circuit inside the data acquisition circuit converts the 12V voltage into 5V and 3.3V voltage. In fig. 4, J2 is used to extract 5V and 3.3V power supplies, and further, the MAX232 chip is a single power level conversion chip designed for RS-232 standard serial ports, and may be replaced with chips of the same type and chips of SPS2323 and other types.
Furthermore, the first stage of integrated operational amplifier circuit is a negative feedback amplifier circuit, which amplifies the micro-current into reverse voltage R1For the feedback resistance with amplification function, the second stage integrated operational amplifier circuit is a reverse voltage follower, and the output voltage of the first stage integrated operational amplifier circuit is reversely followed to obtain a measurable voltage VOUTAt this time VOUT＝I*R1In which case the voltage V can be measured by measurementOUTAnd a known feedback resistor R1The micro current value to be measured can be obtained through the resistance value.
Furthermore, the feedback resistor R can be replaced1The measuring range is replaced. In this example R1The range of the micro current which can be accurately measured is 1 nA-3.3 uA by adopting 1M omega, and nA-level current measurement can be realized when a feedback resistor of 1G omega is adopted.
Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, a plurality of modifications and decorations without departing from the principle of the present invention should be considered as the protection scope of the present invention.
Claims (6)
1. A micro-current measuring device is characterized in that: the system comprises a power supply circuit, an I-V conversion circuit, a data acquisition circuit and a data processing terminal;
the power supply circuit is used for providing working voltage for the I-V conversion circuit and the data acquisition circuit, the I-V conversion circuit is used for converting direct current micro-current into measurable direct current voltage, the data acquisition circuit is used for acquiring the measurable direct current voltage output by the I-V conversion circuit to perform digital-to-analog conversion and acquire voltage data, the data acquisition circuit is further used for transmitting acquired voltage data signals to the data processing terminal, and the data processing terminal is used for calculating the acquired voltage data signals to acquire measured micro-current values.
2. A microcurrent measuring device according to claim 1, characterized in that: the I-V conversion circuit comprises a first integrated operational amplifier circuit and a second integrated operational amplifier circuit, the output end of the first integrated operational amplifier circuit is connected with the input end of the second integrated operational amplifier circuit, the first integrated operational amplifier circuit is a negative feedback amplifier circuit, the second integrated operational amplifier circuit is a reverse follower, the input end of the first integrated operational amplifier circuit is used for collecting micro-current to be detected, the first integrated operational amplifier circuit is used for obtaining a reverse voltage, and the second integrated operational amplifier circuit is used for changing the voltage direction of the reverse voltage and outputting the micro-current.
3. A microcurrent measuring device according to claim 2, characterized in that: the first integrated operational amplifier circuit comprises a first TCL2201 chip, and the second integrated operational amplifier circuit comprises a second TCL2201 chip;
the IN-pin of the first TCL2201 chip is connected with one end of a resistor R16, the other end of the resistor R16 is connected with a micro-current input end to be tested, the other end of the resistor R16 is also connected with one end of a resistor R1, the other end of the resistor R1 is connected with the OUT pin of the first TCL2201 chip, the other end of the resistor R16 is also connected with one end of a capacitor C7, the other end of the capacitor C7 is connected with the OUT pin of the first TCL2201 chip, the IN + pin of the first TCL2201 chip is grounded, the positive power pin of the first TCL2201 chip is connected with +5V voltage, the positive power pin of the first TCL2201 chip is connected with one end of a capacitor C8, the other end of the capacitor C8 is grounded, the negative power pin of the first TCL2201 chip is connected with-5V voltage, the negative power pin of the first TCL2201 chip is connected with one end of a capacitor C9, the other end of a capacitor C9 is grounded, the OUT pin of the first TCL2201 chip is connected with one end of a resistor R11, the other end of the TCL2201 chip is connected with the second pin of the second TCL 11, an IN-pin of the second TCL2201 chip is connected with one end of a resistor R12, the other end of the resistor R12 is connected with an OUT pin of the second TCL2201 chip, an IN + pin of the second TCL2201 chip is connected with one end of a resistor R13, and the other end of the resistor R13 is connected with the ground; the positive power supply pin of the second TCL2201 chip is connected with +5V voltage, the positive power supply pin of the second TCL2201 chip is connected with one end of a capacitor C15, the other end of the capacitor C15 is grounded, the negative power supply pin of the second TCL2201 chip is connected with-5V voltage, the negative power supply pin of the second TCL2201 chip is connected with one end of a capacitor C16, the other end of the capacitor C16 is grounded, the OUT pin of the second TCL2201 chip is connected with one end of a resistor R15, and the other end of the resistor R15 is connected with the input end of the data acquisition circuit.
4. A microcurrent measuring device according to claim 3, characterized in that: the I-V conversion circuit further comprises a power supply filter circuit and an indicator light circuit, wherein the power supply filter circuit comprises a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5, one end of the capacitor C2 is connected with +5V voltage, the other end of the capacitor C2 is grounded, one end of the capacitor C3 is connected with +5V voltage, and the other end of the capacitor C3 is grounded; one end of a capacitor C4 is connected with-5V voltage, the other end of a capacitor C4 is grounded, one end of a capacitor C5 is connected with-5V voltage, and the other end of a capacitor C5 is grounded;
the indicator lamp circuit include LED lamp D1 and LED lamp D2, LED lamp D1 the anodal and resistance R4 one end be connected, the resistance R4 other end and +5V voltage connection, LED lamp D1's negative pole ground connection, LED lamp D2's anodal and resistance R5 one end be connected, resistance R5 other end ground connection, LED lamp D1's negative pole and-5V voltage connection.
5. A microcurrent measuring device according to claim 3, characterized in that: the data acquisition circuit comprises an STM32F103C8T6 type single chip microcomputer and an ADS1115 type AD chip, the ADS1115 type AD chip sends acquired voltage signals to the STM32F103C8T6 type single chip microcomputer after digital-to-analog conversion, and the STM32F103C8T6 type single chip microcomputer transmits decimal voltage values to the PC through an RS232 serial port.
6. A microcurrent measuring device according to claim 5, characterized in that: AN AN3 pin of the ADS1115 chip is connected with a No. 1 interface of a socket J4, AN AN2 pin of the ADS1115 chip is connected with a No. 2 interface of a socket J4, AN AN1 pin of the ADS1115 chip is connected with a No. 3 interface of a socket J4, AN AN0 pin of the ADS1115 chip is connected with a No. 4 interface of a socket J4, and a No. 4 interface of the socket J4 is connected with the other end of a resistor R15; the SCL line of the ADS1115 chip is connected with the PB14 pin of the STM32F103C8T6 type single chip microcomputer, the SDA line of the ADS1115 chip is connected with the PB13 pin of the STM32F103C8T6 type single chip microcomputer, the PA9 pin of the STM32F103C8T6 type single chip microcomputer is connected with the T1IN pin of the MAX232 chip, the PA10 pin of the STM32F103C8T6 type single chip microcomputer is connected with the R1OUT pin of the MAX232 chip, and the output end of the MAX232 chip is connected with a PC through an RS232 serial port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022450979.6U CN213780205U (en) | 2020-10-29 | 2020-10-29 | Micro-current measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022450979.6U CN213780205U (en) | 2020-10-29 | 2020-10-29 | Micro-current measuring device |
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| CN213780205U true CN213780205U (en) | 2021-07-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113985170A (en) * | 2021-10-26 | 2022-01-28 | 杭州电子科技大学 | Automatic transmission efficiency measuring system and method based on wireless electric energy transmission device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113985170A (en) * | 2021-10-26 | 2022-01-28 | 杭州电子科技大学 | Automatic transmission efficiency measuring system and method based on wireless electric energy transmission device |
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