#The7thLiChuangElectricityContest#USB charging power meter

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* 1. Project function introduction
The USB power meter made based on N32G430C8L7+INA199 can check the voltage and current when USB is working, and supports fast charging, but is limited by components. The allowed voltage is 5~24V and the current is within 2.5A.
 
*2. Project attributes
This project refers to the official case.
https://oshwhub.com/limengmeng12345/ji-chu-ying-usb-dian-ya-biao
* 3. Open source agreement
GPL 3.0
 
*4. Hardware part The main
control chip uses 3.3V voltage, and the voltage conversion uses the low voltage difference LDO regulator HT7533, which can convert the input 5-24VDC into 3.3V voltage for the main control. The temperature is normal when the input is 12V, and the LDO temperature rises faster at 20V, so if the voltage is higher, it is recommended to use BUCK step-down chip.
The main control MCU is N32G430C8L7 from National Technology, which is powerful. This project only uses a small number of pins to achieve voltage sampling, current sampling, OLED display and program burning functions.
The voltage sampling circuit uses two resistors for voltage division.
The current sampling circuit uses INA199 chip combined with 0.01 ohm sampling resistor.
 
 
*5. See the attachment for the software part
. *6. See the project below for
 
the BOM list *7. Competition LOGO verification * 8. Demonstrate your project and record it as a video and upload it