#4-way traffic light control system

from machine import Pin
import time

P=[25,26,27,14,12,13,18,5,17,22,21,19]
led=[]
inp=[[0,0,1,1,0,0,0,0,1,1,0,0],[0,1,0,0,1,0,0,1,0,0,1,0],[1,0,0,0,0,1,1,0,0,0,0,1],
    [0,1,0,0,1,0,0,1,0,0,1,0]]

for i in range(12):
    led.append(Pin(P[i], Pin.OUT))

while True:
    for i in range(4):
        for j in range(12):
            if inp[i][j]==1:
                led[j].on()
            else:
                led[j].off()
        if i%2==0:
            time.sleep(4)
        else:
            time.sleep(0.5)  
    time.sleep(0.5);