#The 7th Lichuang Electric Competition# USB voltage and current meter based on N32

 1. Introduction to project functions :
This USB ammeter based on N32G430C8L7+INA199 supports up to 20V fast charging protocol and does not generate heat during long-term operation.
The project design referenced: [Training Camp Official Case] ​​USB Ammeter - Jialichuang EDA Open Source Hardware Platform (oshwhub.com)

 
2. Project content:
It comes with 0.91-inch OLED support, which can intuitively display the charging power
and supports up to 20V fast charging protocol.
 
3. The hardware part of
the PCB is designed by Jialichuang EDA.
The current sampling uses TI's INA199 current sensing amplifier, and the sampling method is low-side sampling.
The voltage sampling part consists of a series voltage divider circuit composed of two resistors.
 
4. The software part
 is developed using Keil v5. The project code is modified based on the reference project and supports 8Mhz external crystal oscillator.
 
5. Physical verification