from machine import Pin, PWM
import time

# 创建 PWM 对象，连接到特定引脚（例如 GP0）
speaker = PWM(Pin(0))

# 设置频率和占空比
speaker.freq(1000)      # 1kHz 频率
speaker.duty_u16(32768) # 50% 占空比

def play_tone(frequency, duration):
    speaker = PWM(Pin(0))
    speaker.freq(frequency)
    speaker.duty_u16(32768)
    time.sleep(duration)
    speaker.duty_u16(0)    # 停止声音

# 播放音阶
# play_tone(262, 0.5)  # 中音 Do
# play_tone(294, 0.5)  # 中音 Re
# play_tone(330, 0.5)  # 中音 Mi

# 定义音符频率
NOTES = {
    'C4': 262,
    'D4': 294,
    'E4': 330,
    'F4': 349,
    'G4': 392,
    'A4': 440,
    'B4': 494
}

def play_melody(melody, durations):
    speaker = PWM(Pin(0))
    for note, duration in zip(melody, durations):
        if note in NOTES:
            speaker.freq(NOTES[note])
            speaker.duty_u16(32768)
            time.sleep(duration)
        speaker.duty_u16(0)
        time.sleep(0.1)  # 音符间短暂停顿

# 播放小星星
melody = ['C4', 'C4', 'G4', 'G4', 'A4', 'A4', 'G4']
durations = [0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 1.0]
while True:
    play_melody(melody, durations)