import machine
import time

RED_LED_PIN = 1 #GP0
YELLOW_LED_PIN = 5 #GP1
GREEN_LED_PIN = 9 #GP2
red_led = machine.Pin(RED_LED_PIN,machine.Pin.OUT)
yellow_led = machine.Pin(YELLOW_LED_PIN,machine.Pin.OUT)
green_led = machine.Pin(GREEN_LED_PIN,machine.Pin.OUT)

def ture_on_led(led_pin):
    red_led.value(led_pin == RED_LED_PIN)
    yellow_led.value(led_pin == YELLOW_LED_PIN) 
    green_led.value(led_pin == GREEN_LED_PIN)

    #TRAFFICE LIGHT SEQUENCE

 while True:
        #red light
        turn_on_led(RED_LED_PIN)
        time.sleep(5)

        #red to yellow
        turn_on_led(YELLOW_LED_PIN)
        time.sleep(2)

        #GREEN
        turn_on_led(GREEN_LED_PIN)
        time.sleep(5)

        #YELLOW LIGHT
        turn_on_led(YELLOW_LED_PIN)
        time.sleep(2)