from machine import Pin, ADC, PWM
import time

ldr = ADC(Pin(34)) 
ldr.atten(ADC.ATTN_0DB)  
led = Pin(15, Pin.OUT)
buzzer = PWM(Pin(17), freq=300, duty=512) 
threshold = 500  

def read_ldr():
    return ldr.read()

while True:
    light_level = read_ldr()
    print("LDR Value (Lux):", light_level)    
    if light_level < threshold:       
        led.on()
        buzzer.duty(512)  # Activate the buzzer
        time.sleep(0.5)
        buzzer.duty(0)
    else:    
        led.off()
        buzzer.duty(0)  # Deactivate the buzzer    
    time.sleep(1)