# Import
from machine import Pin
from time import sleep

# Setup
green_led = Pin(28, Pin.OUT)
orange_led = Pin(27, Pin.OUT)
red_led = Pin(26, Pin.OUT)

# Loop
while True:
    # Green Light
    green_led.on()
    orange_led.off()
    red_led.off()
    print('GO')
    sleep(5)

    # Orange Light
    green_led.off()
    orange_led.on()
    red_led.off()
    print('WAIT')
    sleep(2)

    # Red Light
    green_led.off()
    orange_led.off()
    red_led.on()
    print('STOP')
    sleep(3)