from machine import ADC, Pin # import ADC and Pin classes
import time # import time module

adc = ADC(26) # create ADC object from Pin26
pinLED = Pin(28, Pin.OUT)

try: # if have no error, run the program between try: and except:
    while True: # create an infinite loop
        adcValue = adc.read_u16() # read ADC value
        voltage = adcValue / 65535.0 * 3.3 # calculate voltage
        # print ADC value and voltage
        print("ADC Value:", adcValue, "Voltage:", voltage, "V")
        time.sleep(0.1) # sleep 100 milliseconds
        if voltage == 3.3:
            pinLED.on() # set pinLED turn on
        else:
            pinLED.off() # set pinLED turn on

except: # if have error, run the program between except:
    pass # do nothing