from machine import Pin, PWM, ADC
import utime

# Inisialisasi
ldr = ADC(28)
led = Pin(6, Pin.OUT)
buzzer = PWM(Pin(15))
buzzer.freq(1000)
buzzer.duty_u16(0)

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

# Mengambil nilai lux normal
print("Kalibrasi Lux Normal...")
lux_normal = 0
sampel = []
start = utime.ticks_ms()
while utime.ticks_diff(utime.ticks_ms(), start) < 2000:
    sampel.append(adc_to_lux(ldr.read_u16()))
    utime.sleep(0.05)

lux_normal = sum(sampel) / len(sampel)
print(f"Lux Normal = {lux_normal:.2f} Lux")

# Variabel
led_blinking = False
blink_start = 0
last_toggle = 0
led_state = False
alarm_triggered = False

# Loop utama
while True:
    nilai_adc = ldr.read_u16()
    lux = adc_to_lux(nilai_adc)

    print(f"Lux Sekarang: {lux:.2f}")

    # Cek lux lebih terang dari normal
    if not alarm_triggered and (lux - lux_normal) >= 200:
        buzzer.duty_u16(int(0.25 * 65535))   # Nyalakan buzzer (25% duty)
        led_blinking = True
        blink_start = utime.ticks_ms()
        last_toggle = blink_start
        alarm_triggered = True
        print(">>> Alarm Aktif <<<")

    # Proses kedip LED
    if led_blinking:
        now = utime.ticks_ms()
        if utime.ticks_diff(now, last_toggle) >= 300:
            led_state = not led_state
            led.value(led_state)
            last_toggle = now

        if utime.ticks_diff(now, blink_start) >= 2000:
            led_blinking = False
            led.off()

    utime.sleep(0.1)