from machine import Pin
from time import sleep

# EEM 433 - Experiment 5
# Raspberry Pi Pico - Traffic Light

GREEN = Pin(16, Pin.OUT)
YELLOW = Pin(17, Pin.OUT)
RED = Pin(18, Pin.OUT)

def all_off():
    GREEN.off()
    YELLOW.off()
    RED.off()

def light(led, name):
    all_off()
    print(name + " ON")
    led.on()
    sleep(4)
    led.off()
    print(name + " OFF")
    sleep(1)

while True:
    light(GREEN, "GREEN")
    light(YELLOW, "YELLOW")
    light(RED, "RED")