# ------------------------------------------------------------
#  Bai 3 - Den giao thong ba mau
#  Phan cung: GPIO23 -> den do, GPIO18 -> den vang, GPIO19 -> den luc
#             moi den qua mot dien tro 220 ohm roi ve GND
# ------------------------------------------------------------
from machine import Pin
import time

# ===== CẤU HÌNH =====
CHAN_DO   = 23            # den do
CHAN_VANG = 18            # den vang
CHAN_LUC  = 19            # den luc
THOI_GIAN_DO   = 5000     # ms
THOI_GIAN_LUC  = 4000     # ms
THOI_GIAN_VANG = 2000     # ms
# ====================

do   = Pin(CHAN_DO, Pin.OUT)
vang = Pin(CHAN_VANG, Pin.OUT)
luc  = Pin(CHAN_LUC, Pin.OUT)

while True:
    # Luon tat het truoc, roi moi bat den can sang
    vang.off()
    luc.off()
    do.on()
    time.sleep_ms(THOI_GIAN_DO)

    do.off()
    luc.on()
    time.sleep_ms(THOI_GIAN_LUC)

    luc.off()
    vang.on()
    time.sleep_ms(THOI_GIAN_VANG)