# CÂU 1 - MicroPython ESP32

from machine import Pin
import time

led_green = Pin(32, Pin.OUT)
led_yellow = Pin(33, Pin.OUT)
led_red = Pin(25, Pin.OUT)

temp = 20
increasing = True

def turn_off_all():
    led_green.off()
    led_yellow.off()
    led_red.off()

while True:

    # giả lập nhiệt độ
    if increasing:
        temp += 0.5
    else:
        temp -= 0.5

    if temp >= 40:
        increasing = False
    if temp <= 20:
        increasing = True

    turn_off_all()

    if temp < 25:
        led_green.on()
    elif temp <= 35:
        led_yellow.on()
    else:
        led_red.on()

    time.sleep(0.2)