Datasheet

For CircuitPython, we've written a get_voltage() helper function to do the math for you. All you have to do is call the

function, provide the pin and print the results.

ENable pin

If you'd like to turn off the 3.3V regulator, you can do that with the EN(able) pin. Simply tie this pin to Ground and it will

disable the 3V regulator. The BAT and USB pins will still be powered

// Arduino Example Code

#define VBATPIN A7

float measuredvbat = analogRead(VBATPIN);

measuredvbat *= 2; // we divided by 2, so multiply back

measuredvbat *= 3.3; // Multiply by 3.3V, our reference voltage

measuredvbat /= 1024; // convert to voltage

Serial.print("VBat: " ); Serial.println(measuredvbat);

import board

import analogio

vbat_voltage = analogio.AnalogIn(board.D9)

def get_voltage(pin):

return (pin.value * 3.3) / 65536 * 2

battery_voltage = get_voltage(vbat_voltage)

print("VBat voltage: {:.2f}".format(battery_voltage))

https://learn.adafruit.com/adafruit-feather-m0-express-designed-for-circuit-python-

circuitpython

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