CircuitPython battery voltage code

Author: kattni

Introducing_Feather_M0_Express/battery_voltage.py

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+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))