from machine import Pin
import time

# LED 初始化
red = Pin(15, Pin.OUT)
yellow = Pin(14, Pin.OUT)
green = Pin(13, Pin.OUT)

while True:

    # 綠燈亮 5 秒
    green.value(1)
    yellow.value(0)
    red.value(0)
    time.sleep(5)

    # 黃燈亮 2 秒
    green.value(0)
    yellow.value(1)
    red.value(0)
    time.sleep(2)

    # 紅燈亮 5 秒
    green.value(0)
    yellow.value(0)
    red.value(1)
    time.sleep(5)