from machine import Pin
from utime import sleep, sleep_ms

led_r = Pin(4, Pin.OUT)
led_y = Pin(5, Pin.OUT)
led_g = Pin(6, Pin.OUT)
led_r1 = Pin(37, Pin.OUT)
led_y1 = Pin(38, Pin.OUT)
led_g1= Pin(39, Pin.OUT)

while True:
    led_r.on()
    led_y.off()
    led_g.off()
    led_r1.off()
    led_y1.off()
    led_g1.on()
    sleep_ms(3000)
    led_r.off()
    led_y.on()
    led_g.off()
    led_r1.off()
    led_y1.on()
    led_g1.off()
    sleep_ms(3000)
    led_r.off()
    led_y.off()
    led_g.on()
    sleep_ms(1000)
    led_r.off()
    led_y.on()
    led_g.off()
    sleep_ms(1000)