from machine import Pin, ADC
import utime

# Pin setup
ldr = ADC(28)
led = Pin(6, Pin.OUT)
buzzer = Pin(15, Pin.OUT)  # Ganti dari PWM ke digital pin

# Fungsi konversi
def adc_to_lux(adc_value):
    return (adc_value / 65535) * 900 + 10

# Kalibrasi awal
print("Kalibrasi pencahayaan...")
start_time = utime.ticks_ms()
lux_sum = 0
count = 0

while utime.ticks_diff(utime.ticks_ms(), start_time) < 5000:
    lux = adc_to_lux(ldr.read_u16())
    lux_sum += lux
    count += 1
    utime.sleep(0.1)

lux_normal = lux_sum / count
print(f"Kalibrasi selesai. Lux Normal: {lux_normal:.2f} lux")

# Loop utama
while True:
    lux = adc_to_lux(ldr.read_u16())
    print(f"Lux Sekarang: {lux:.2f} lux")

    if lux < (lux_normal - 50):
        print("❗ Gelap! LED dan Buzzer aktif selama 3 detik.")
        buzzer.on()  # Aktifkan buzzer digital
        start_blink = utime.ticks_ms()
        
        while utime.ticks_diff(utime.ticks_ms(), start_blink) < 3000:
            led.toggle()
            utime.sleep(0.5)

        led.off()
        buzzer.off()
    else:
        led.off()
        buzzer.off()

    utime.sleep(0.2)