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

# 핀 설정
trigger = Pin(17, Pin.OUT)
echo = Pin(16, Pin.IN)
led = Pin(28, Pin.OUT)
buzzer = PWM(Pin(13))

# 도레미파솔라시도 음계 (Hz)
notes = (262, 294, 330, 349, 392, 440, 494, 523)

def get_distance():
    """초음파 센서로 거리(cm) 측정"""
    trigger.low()
    sleep_us(2)
    trigger.high()
    sleep_us(10)
    trigger.low()
    pulse_time = time_pulse_us(echo, 1, 1000000)  # Echo 신호 길이(us)
    distance = (pulse_time * 0.0343) / 2
    return distance

def play_melody():
    """도레미파솔라시도 멜로디 재생"""
    for f in notes:
        buzzer.freq(f)
        buzzer.duty_u16(32768)  # 소리 크기 (0~65535)
        sleep(0.4)
        buzzer.duty_u16(0)
        sleep(0.1)
    buzzer.duty_u16(0)  # 완전히 끄기

while True:
    distance = get_distance()
    print("거리:", distance, "cm")

    if distance <= 100:  # 100cm 이하일 때 반응
        led.value(1)
        play_melody()
    else:
        led.value(0)

    sleep(1)