pyb ADC

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This is how the ADC works:?

The ADC VREF is A3V3. The ADC is 12-bit The ADC values range from (0) to (4096), and can be estimated int(Vapplied/3v3*4096). All analog input pin Structures are only 3v3 tolerant. NEVER exceed 4.0 V on analog input pins. (STM32 DM00037051 Section 5.2)