from machine import ADC, Pin
import time

REFERENCE_VOLTAGE = 3.3

# Setup ADC for pin 26 (A0 on the XIAO RP2040)
adc = ADC(Pin(26))


def read_voltage(adc):
    value = adc.read_u16()      # Read the raw 16-bit value
    voltage = (value / 65535) * REFERENCE_VOLTAGE  # Convert to voltage
    return voltage


while True:
    voltage = read_voltage(adc)
    print("Voltage:", voltage, "V")
    time.sleep(1)  # Wait for a second before reading again