from machine import Pin, ADC, time_pulse_us
from time import sleep, sleep_us

# ----------------------------
# 핀 설정
# ----------------------------
# 초음파 센서
trigger = Pin(17, Pin.OUT)
echo = Pin(16, Pin.IN)

# 거리 감지 LED
led_distance = Pin(28, Pin.OUT)

# 깜빡이 LED
led_blink = Pin(15, Pin.OUT)

# 조도 센서(LDR)
lightmeter = ADC(26)

# ----------------------------
# 함수: LDR 평균값 읽기
# ----------------------------
def read_light():
    total = 0
    for _ in range(10):
        total += lightmeter.read_u16()
        sleep_us(5)
    return total / 10

# ----------------------------
# 메인 루프
# ----------------------------
while True:
    # --- 1) 초음파 센서 거리 측정 ---
    trigger.low()
    sleep_us(2)
    trigger.high()
    sleep_us(10)
    trigger.low()

    pulse_time = time_pulse_us(echo, 1, 1000000)

    if pulse_time < 0:
        distance = None
        print("초음파 센서 응답 없음")
        led_distance.value(0)
    else:
        distance = (pulse_time * 0.0343) / 2
        print("거리:", distance, "cm")
        # 거리 100cm 이하 → LED ON
        if distance <= 100:
            led_distance.value(1)
        else:
            led_distance.value(0)

    # --- 2) 외부 LED 깜빡이 ---
    led_blink.toggle()

    # --- 3) 조도 센서 측정 ---
    adc_val = read_light()
    lux = (1 - (adc_val / 65535)) * 1000
    if lux <= 100:
        print(f"{lux:.1f} → 어두움")
    elif lux <= 400:
        print(f"{lux:.1f} → 보통")
    else:
        print(f"{lux:.1f} → 밝음")

    sleep(0.5)