ADC voltage calculation of STM32 single chip microcomputer

Abstract ：

Because of the MCU ADC More development and use , Then we need to pay attention ADC The reference voltage of , The final voltage value obtained by different reference voltages is different , alike , The number of bits of resolution will also affect the final value of voltage ;

If the reference voltage is 5V, And use ADC The sampling resolution of is 12 position , Then we are initializing GPIO After a mouth , You need to :

for example ： What is collected is the pressure of the battery , Then the original voltage collected is Volss, Final voltage ：Vol

Vol = (Volss * 5.0)/2*12

      = (Volss * 5.0)/4096