Rn7302 three-phase electric quantity detection (based on STM32 single chip microcomputer)

Read voltage data

The second digit is converted to decimal d5( Hexadecimal ) = 213( Decimal system )

The main control chip sometimes does not work

Use AC-DC The power supply supplies power to the chip , Chips sometimes don't work , Direct use of DC power supply ３.３V Power supply , The chip works
Final control panel GND Connected to metal shell through diode , Use AC-DC The power supply supplies power to the chip , The chip works properly .