A low-cost USB voltmeter with screen
MCU: AT32F421G8U7
Current sampling: INA226
Screen: ST7735
DC-DC buck: MP2451
2-Layer board
Refer to bare-metal version: https://github.com/wwng2333/stupid_meter/tree/RevB-AT32F421
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usb type-c meter with lcd screen, powered by CMSIS-RTOS2.
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