from machine import ADC, Pin
from time import sleep

adc = ADC(4)
ledR = Pin(2, Pin.OUT)
ledA = Pin(16, Pin.OUT)
ledB = Pin(17, Pin.OUT)

while True:
    valor = adc.read()
    print(valor)
    if valor > 100 and valor < 1000: 
        ledR.on()   
        ledA.off()
        ledB.off()
    elif valor >= 1000 and valor < 3000:
        ledA.on()
        ledR.on()
        ledB.off()
    elif valor >= 3000:
        ledA.on()
        ledR.on()
        ledB.on()

    elif valor <= 100:
        ledR.off()
        ledA.off()
        ledB.off()
    sleep(0.5)