#The7thLiChuangElectricityContest#USB Ammeter

Note: * is a required field,
please fill it in during the registration stage↓
 
* 1.
Please enter the content
of the project function introduction... USB ammeter based on N32G430C8L7+INA199, with an accuracy of 1%.
 
* 2. The project attributes
are first public, original, and have never won awards...
 
 
 
* 3.
Please enter the content of the open source agreement...
 
Note: Altruism is self-interest, please read the following content carefully.
Embrace open source and give unlimited value to the project. It is recommended that more than 80% of the core functions of the project be open source;
if a part of the function is irreplaceable and the project cannot solve the corresponding problem after deleting it, then the function implemented by this part is the core function of the project; for example, if an electronic load is designed and a host computer software is designed to monitor power changes, the electronic load is the core function and the host computer software is an auxiliary function; for example, an isolated 485 module is used in the electronic load to communicate with the host computer, then the communication function implemented by this 485 module is an auxiliary function;
the project should choose an open source protocol that suits it. If the project references other open source projects, the source should be indicated and the open source protocol of the original author should be followed; the original project is recommended to use the GPL3.0 open source protocol;
the functions implemented by directly referencing the original circuit or original code of the open source project cannot be used as the core functions of your own project, and the functions directly implemented by using the general modules on the market cannot be used as the core functions of your own project.
 
Please fill in the following in the competition stage↓
 
*4. Hardware
   The N32G430C8L7 microcontroller product adopts a high-performance 32-bit ARM Cortex™-M4F core, integrates a floating-point unit (FPU) and digital signal processing (DSP), and supports parallel computing instructions. The maximum operating frequency is 128MHz, with up to 64KB of on-chip encrypted storage Flash, and supports multi-user partition authority management, and supports 16KB of embedded SRAM. It has a built-in internal high-speed AHB bus, two low-speed peripheral clock buses APB and bus matrix, supports 40 reusable I/Os, provides a rich high-performance analog interface, including a 12-bit 4.7Msps ADC, supports 16 external input channels and 3 internal channels, and provides a variety of digital communication interfaces, including 4 U(S)ARTs, 2 I2Cs, 2 SPI/I2S, and 1 CAN 2.0B communication interface. The N32G430C8L7 microcontroller product can work stably in the temperature range of -40°C to +105°C, with a supply voltage of 2.4V to 3.6V, and provides a variety of power consumption modes.
       The chip used in this project is N32G430C8L7. When designing the circuit, it should be noted that each power pin of the chip needs to be connected to an additional 100nF external filter capacitor, and the 1st pin of the chip needs to be connected to an additional 4.7uf filter capacitor. The circuit diagram is shown in the figure.
 
The step-down circuit steps down 5V to 3.3V to work the chip.
 
Reset circuit
 
current sampling
 
 
program burning circuit
 
 
 
* 5, BOM list
 
 
* 6, competition LOGO verification
 
* 8, demonstrate your project and record it into a video for uploading.
 
 
 
More details: https://diy.szlcsc.com/posts/d76d9cb41705430e9a54e7a5feed07a5