#The7thLiChuangElectricityContest#USB voltage and current meter

1. Project function introduction
Based on the N32G430C8L7 chip of National Technology, the USB voltage and current meter can measure the voltage, current and power of the load and display it through the 0.91-inch SSD1603 OLED with an accuracy of 1%.
 
 
 
2. Hardware part Main
control circuit: Refer to the "N32G430C8L7_STB Development Board Hardware Usage Guide" of National Technology
 
Power supply: AMS1117-3.3V is used .
The following is the voltage conversion circuit
 
Current sampling circuit: Use INA199A1DCKR
 
voltage sampling circuit:
 
 
3. Software part
Use the official program code, modify the definition of the display pin interface, library function and screen initialization code, and in order to improve the measurement accuracy, also modify the ratio of the actual voltage to the meter voltage and the ratio of the actual current to the meter current. For the program burning method, I use the PWLINK 2 burner of Chuangxin Workshop, which needs to be burned online.
 
Screen initialization code Modify
 
the screen pin definition Modify
 
the library function Modify
 
the accuracy Modify
 
the PWLINK2 burning method Need to burn online! ! ! !
 
4. Contest LOGO verification.
 
I was not familiar with EasyEDA Professional Edition and accidentally got the logo wrong.
 
5. Demonstrate your project and record it as a video and upload it