from machine import Pin
import time
time.sleep(0.1) # Wait for USB to become ready
r1=Pin(2,Pin.OUT)
y1=Pin(3,Pin.OUT)
g1=Pin(4,Pin.OUT)
r2=Pin(28,Pin.OUT)
y2=Pin(26,Pin.OUT)
g2=Pin(21,Pin.OUT)
print(" Traffic light sequence")

r1.value(0)
y1.value(0)
g1.value(0)
r2.value(0)
y2.value(0)
g2.value(0)
time.sleep(2)

while True:
 # TL1 - RED  TL2- GREEN
 r1.value(1)
 y1.value(0)
 g1.value(0)
 time.sleep(2)
 r2.value(0)
 y2.value(0)
 g2.value(1)
 time.sleep(5)

 # TL1 - Yellow TL2 - Yellow 

 r1.value(0)
 y1.value(1)
 g1.value(0)
 r2.value(0)
 y2.value(1)
 g2.value(0)
 time.sleep(5)

 # TL1 - GREEN  TL2 - RED 

 y2.value(0)
 r2.value(1)
 g2.value(0)
 time.sleep(2)
 r1.value(0)
 y1.value(0)
 g1.value(1)
 time.sleep(5)

 # TL1 - Yellow TL2 - Yellow 

 r1.value(0)
 y1.value(1)
 g1.value(0)
 r2.value(0)
 y2.value(1)
 g2.value(0)
 time.sleep(5)