STM32 ADC voltage value calculation-EEWORLD

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When using the STM32 ADC to detect voltage, the calculation of the voltage value must be involved. In order to obtain the voltage more efficiently, there are now three methods:

The result you get is the voltage value on your current AD pin relative to 3.3V and 4096 converted into a digital number.
If the AD result you get is the variable ADC_DR, they have the following relationship:

ADC_DR/current voltage value = 4096/3300 mV If you want to get the current voltage value in reverse, you can calculate it as follows:
unsigned long Voltage;
Voltage = ADC_DR;

//---Assume that the AD result you get is stored in the variable ADC_DR;
Voltage = (Voltage * 3300)/4096; //----you get the correct voltage result, the unit is mV

Generally for efficiency, we will reduce it ourselves:
Voltage = (Voltage * 825)/1024; //----you get the correct voltage result, the unit is mV

And further, the efficiency will be higher:
Voltage = (Voltage * 825)>>10; //----you get the correct voltage result, the unit is mV

Keywords：STM32 ADC Reference address：STM32 ADC voltage value calculation

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