from machine import Pin, ADC, Timer
from time import sleep

ldr = ADC(Pin(26))
ldr.atten(ADC.ATTN_11DB)

red = Pin(15, Pin.OUT)
yel = Pin(2, Pin.OUT)
gre = Pin(4, Pin.OUT)
buzzer = Pin(12, Pin.OUT)

while True:
    lus = ldr.read()

    print(lus)

    if lus >= 3250 and lus <= 4063:
        red.on()
        yel.off()
        gre.off()

    elif lus >= 2031 and lus < 3250:
        yel.on()
        red.off()
        gre.off()

    elif lus < 2031:
        yel.off()
        red.off()
        gre.on()

    else:
        gre.off()
        red.off()
        yel.off()

red.off()
gre.off()
yel.off()

sleep(0.5)