from machine import Pin, PWM, ADC
import utime

# Pin Setup
ldr = ADC(28)         # Pin AO dari LDR ke GP28
ldr_digital = Pin(0, Pin.IN)  # Pin DO dari LDR ke GP0
led = Pin(6, Pin.OUT)  # LED di GP6
buzzer = PWM(Pin(15))  # Buzzer di GP15 dengan PWM

# Konfigurasi PWM Buzzer
buzzer.freq(1000)      # Frekuensi awal buzzer (1kHz)
buzzer.duty_u16(0)     # Mulai dengan buzzer mati

# Fungsi untuk mengonversi nilai ADC ke lux 
def adc_to_lux(adc_value):
    return (adc_value / 65535) * 900 + 10  # Rentang 10 - 1000 lux

# Variabel untuk menyimpan kondisi normal awal
lux_normal = 0

# Variabel untuk kedip LED
last_blink_time = utime.ticks_ms()
led_state = False
led_should_blink = False  # hanya True saat kondisi mendeteksi perubahan cahaya signifikan

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

    if lux_normal == 0:
        lux_normal = lux
        print(f"Lux Normal: {lux_normal}")

    print(f"LDR Value: {analog_value} | Lux: {lux}")

    if lux < lux_normal + 75:
        led_should_blink = True  # nyalakan mode kedip
        buzzer.duty_u16(9830)   # nyalakan buzzer
        for i in range(500, 1000, 100):  # variasi frekuensi buzzer
            buzzer.freq(i)
            utime.sleep(0.1)
    else:
        led_should_blink = False
        led.off()
        buzzer.duty_u16(0)

    # Kedip LED jika perlu
    if led_should_blink:
        current_time = utime.ticks_ms()
        if utime.ticks_diff(current_time, last_blink_time) >= 1000:
            led_state = not led_state
            led.value(led_state)
            last_blink_time = current_time

    utime.sleep(0.1)  # sedikit delay supaya tidak terlalu cepat baca LDR