from machine import ADC
import time

adc = ADC(26)   # GP26 = ADC0
period_ms = 500

print("PICO SENSOR NODE READY")
print("Rotate the potentiometer to change ADC value")

last = time.ticks_ms()

while True:
    now = time.ticks_ms()
    if time.ticks_diff(now, last) >= period_ms:
        last = now
        raw = adc.read_u16()      # 0..65535
        volt = raw * 3.3 / 65535
        print("ADC0_RAW:", raw, "V:", round(volt, 3))