from machine import Pin, PWM, ADC
import utime

# Pin Setup
ldr = ADC(28)  # Pin AO dari LDR ke GP28
led = Pin(6, Pin.OUT)  # LED merah ke GP6
buzzer = PWM(Pin(15))  # Buzzer ke GP15 (PWM)

# Konfigurasi buzzer
buzzer.freq(1000)
buzzer.duty_u16(0)  # Mulai dalam keadaan mati

# Fungsi konversi ADC ke lux
def adc_to_lux(adc_value):
    return (adc_value / 65535) * 900 + 10  # Estimasi 10-1000 lux

# Baca nilai normal awal sebagai baseline pencahayaan
print("Mengukur pencahayaan normal...")
utime.sleep(2)  # Waktu stabilisasi
lux_normal = adc_to_lux(ldr.read_u16())
print("Nilai lux normal:", lux_normal)

while True:
    analog_value = ldr.read_u16()
    lux = adc_to_lux(analog_value)
    print("Lux sekarang:", lux)

    if lux > lux_normal + 250:
        print("Terdeteksi cahaya terang! Menyalakan LED & buzzer.")
        start_time = utime.ticks_ms()
        
        buzzer.duty_u16(int(65535 * 0.45))  # Duty cycle 45%
        
        while utime.ticks_diff(utime.ticks_ms(), start_time) < 4000:
            led.toggle()
            utime.sleep(0.5)  # LED berkedip tiap 0.5 detik
        
        # Matikan LED dan buzzer setelah 4 detik
        led.value(0)
        buzzer.duty_u16(0)

    utime.sleep(0.2)