# four way traffic light system (two way route)

from machine import Pin
import time

red1 = Pin(2, Pin.OUT)    
yellow1 = Pin(14, Pin.OUT) 
green1 = Pin(12, Pin.OUT)  

red2 = Pin(5, Pin.OUT)     
yellow2 = Pin(4, Pin.OUT)   
green2 = Pin(0, Pin.OUT)    

red3 = Pin(13, Pin.OUT)     
yellow3 = Pin(15, Pin.OUT)  
green3 = Pin(32, Pin.OUT)    

red4 = Pin(16, Pin.OUT)     
yellow4 = Pin(27, Pin.OUT)   
green4 = Pin(25, Pin.OUT)   

while True:
    red1.on()
    red3.on()
    green2.on()
    green4.on()
    time.sleep(5)

    red1.off()
    red3.off()
    green2.off()
    green4.off()

    yellow1.on()
    yellow3.on()
    yellow2.on()
    yellow4.on()
    time.sleep(1)
    yellow1.off()
    yellow3.off()
    yellow2.off()
    yellow4.off()

    green1.on()
    green3.on()
    red2.on()
    red4.on()
    time.sleep(5)

    red2.off()
    red4.off()
  
    green1.off()
    green3.off()
   
    yellow1.on()
    yellow3.on()
    yellow2.on()
    yellow4.on()
    time.sleep(1)
    yellow1.off()
    yellow3.off()
    yellow2.off()
    yellow4.off()