from machine import Pin, PWM, ADC
import time

LED_PIN = 2
BUZZER_PIN = 26
LIGHT_SENSOR_PIN = 34

led = Pin(LED_PIN, Pin.OUT, value=0)

buzzer = PWM(Pin(BUZZER_PIN), freq=440, duty=0)

light_sensor = ADC(Pin(LIGHT_SENSOR_PIN))
light_sensor.atten(ADC.ATTN_11DB)

light_threshold = 1500 
check_interval = 200 


def read_light():
    return light_sensor.read()

while True:
    current_light = read_light()
    
    #光线过暗时开启LED灯和蜂鸣器；光线过亮时关闭LED灯和蜂鸣器
    if current_light > light_threshold:
        led.on()
        buzzer.duty(512)
    else:
        led.off()
        buzzer.duty(0)

    time.sleep_ms(check_interval)