from machine import Pin, PWM
import time

# 建立 PWM 控制腳位 (GPIO2)
beeper = PWM(Pin(2, Pin.OUT))

# 音名對應的頻率 (Hz)
tones = {
    "C4": 262, "D4": 294, "E4": 330, "F4": 349,
    "G4": 392, "A4": 440, "B4": 494,
    "C5": 523, "D5": 587, "E5": 659, "F5": 698,
    "G5": 784, "A5": 880, "B5": 988,
    "P": 0   # 休止符 (pause)
}

# 小星星旋律 (音符)
melody = [
    "C4","C4","G4","G4","A4","A4","G4",
    "F4","F4","E4","E4","D4","D4","C4",
    "G4","G4","F4","F4","E4","E4","D4",
    "G4","G4","F4","F4","E4","E4","D4",
    "C4","C4","G4","G4","A4","A4","G4",
    "F4","F4","E4","E4","D4","D4","C4"
]

# 每個音符的時值 (單位：拍) → 4 = 四分音符, 2 = 二分音符
beats = [
    4,4,4,4,4,4,2,
    4,4,4,4,4,4,2,
    4,4,4,4,4,4,2,
    4,4,4,4,4,4,2,
    4,4,4,4,4,4,2,
    4,4,4,4,4,4,2
]

# 基本速度 (一拍 = 0.4 秒，可調快或調慢)
tempo = 0.4

# 播放音樂
for i in range(len(melody)):
    note = melody[i]
    duration = beats[i] * tempo

    if note == "P":   # 休止符
        beeper.duty_u16(0)
    else:
        beeper.freq(tones[note])
        beeper.duty_u16(32768)   # 50% 占空比
    time.sleep(duration * 0.9)   # 音長
    beeper.duty_u16(0)           # 每個音之間留一點空隙
    time.sleep(duration * 0.1)

print("播放完成！")