#The7thLiChuangElectricityContest#Small power meter

1. Project function introduction
Based on N32G430C8L7+INA199, the USB ammeter with an accuracy of 1% can be used to check the current when the USB is working.
 
2. Project attributes
LiChuang summer training camp, learn through official videos, draw the board by yourself and modify some codes.
3. Open source agreement
GPL 3.0
4. Pitfalls
 Tried to use 3 burning methods: PWLINK can be configured according to the DAP link, and STLINK has nothing to say. Among them, TTL download needs to pay attention to the BOOT must be pulled high before burning. After that, pull BOOT down to work normally.
Welding problem: Don't shake your hands, don't be anxious. I have always been good at software and not good at hardware. The welding is crooked. Later, the current sampling chip was too small. I was a little anxious when I got to the last two components. I pulled a pin and the pad together. I still need to practice welding more.
 I forgot to dig when drawing the board, which resulted in flying tin. If you don't know how to draw the edge, just copy and paste the official project. Although mine can be used in the end, the measurement accuracy is reduced.
 Finally, let's take a look at the finished product. The shell can hide the ugliness, but I personally prefer to look at the circuit board directly, which gives it a punk feel.
  
When the screen pins are changed, the following three codes should be modified: