from machine import Pin
import time

LED_RED_1=Pin(2,Pin.OUT)
LED_YELLOW_1=Pin(3,Pin.OUT)
LED_GREEN_1=Pin(4,Pin.OUT)

LED_RED_2=Pin(8,Pin.OUT)
LED_YELLOW_2=Pin(9,Pin.OUT)
LED_GREEN_2=Pin(10,Pin.OUT)

def init_pins():
    LED_RED_1.value(0)
    LED_YELLOW_1.value(0)
    LED_GREEN_1.value(0)
    
    LED_RED_2.value(0)
    LED_YELLOW_2.value(0)
    LED_GREEN_2.value(0)

def traffic_light_sequence():
    while True:
        #turn on red leds and turn off yellow and green leds 
        LED_RED_1.value(1)
        LED_YELLOW_1.value(0)
        LED_GREEN_1.value(0)

        LED_RED_2.value(1)
        LED_YELLOW_2.value(0)
        LED_GREEN_2.value(0)
        time.sleep(3)
        #first traffic light
        
        LED_RED_1.value(0)
        LED_GREEN_1.value(1)
        time.sleep(3)

        LED_GREEN_1.value(0)
        LED_YELLOW_1.value(1)
        time.sleep(1)

        LED_YELLOW_1.value(0)
        LED_RED_1.value(1)
        time.sleep(1)

        #second traffic light
        LED_RED_2.value(0)
        LED_GREEN_2.value(1)
        time.sleep(3)

        LED_GREEN_2.value(0)
        LED_YELLOW_2.value(1)
        time.sleep(1)

        LED_YELLOW_2.value(0)
        LED_RED_2.value(1)
        time.sleep(1)
def main():
    init_pins()
    traffic_light_sequence()
if __name__ == "__main__" :
    main()