import machine
import utime

# ADC on GP26 (ADC0)
potentiometer = machine.ADC(26)

# Conversion factor (ADC counts → volts)
conversion_factor = 3.3 / 65535

while True:
    raw = potentiometer.read_u16()     # 0–65535
    voltage = raw * conversion_factor  # 0–3.3 V

    print("Voltage: {:.2f} V".format(voltage))
    utime.sleep(2)