树莓派pico播放小星星，无源蜂鸣器
from machine import Pin, PWM
import time# ================= 配置区域 =================
BUZZER_PIN = 15 # 蜂鸣器连接的 GPIO 引脚 (建议 GP15)
VOLUME = 20000 # 音量 (0-65535), 建议 40000 (约 60%)
BPM = 80 # 速度 (每分钟拍数), 儿歌建议 60-90
BASE_TEMPO = 60000 // BPM # 计算每拍的毫秒数 (约 750ms)
# ===========================================# 初始化 PWM
buzzer = PWM(Pin(BUZZER_PIN))
buzzer.duty_u16(VOLUME)# 音符频率表 (C 大调)
# 对应简谱：1=C, 2=D, 3=E, 4=F, 5=G, 6=A
NOTES = {'C4': 261, 'D4': 293, 'E4': 329, 'F4': 349, 'G4': 392, 'A4': 440,'C5': 523, # 高音 C'0': 0 # 休止符
}# 小星星 旋律数据
# 格式：(音符，节拍数)
# 节拍数：1 = 一拍，2 = 两拍 (结尾音)
SONG = [# 1 1 5 5 6 6 5 - (一闪一闪亮晶晶)('C4', 1), ('C4', 1), ('G4', 1), ('G4', 1), ('A4', 1), ('A4', 1), ('G4', 2),# 4 4 3 3 2 2 1 - (满天都是小星星)('F4', 1), ('F4', 1), ('E4', 1), ('E4', 1), ('D4', 1), ('D4', 1), ('C4', 2),# 5 5 4 4 3 3 2 - (挂在天上放光明)('G4', 1), ('G4', 1), ('F4', 1), ('F4', 1), ('E4', 1), ('E4', 1), ('D4', 2),# 5 5 4 4 3 3 2 - (好像许多小眼睛)('G4', 1), ('G4', 1), ('F4', 1), ('F4', 1), ('E4', 1), ('E4', 1), ('D4', 2),# 1 1 5 5 6 6 5 - (一闪一闪亮晶晶)('C4', 1), ('C4', 1), ('G4', 1), ('G4', 1), ('A4', 1), ('A4', 1), ('G4', 2),# 4 4 3 3 2 2 1 - (满天都是小星星)('F4', 1), ('F4', 1), ('E4', 1), ('E4', 1), ('D4', 1), ('D4', 1), ('C4', 2),
]def play_note(note, beats):"""播放单个音符"""freq = NOTES.get(note, 0)if freq == 0:# 休止符：静音buzzer.duty_u16(0)else:# 发声：设置频率和音量buzzer.freq(freq)buzzer.duty_u16(VOLUME)# 计算持续时间 (毫秒)duration = int(BASE_TEMPO * beats)time.sleep_ms(duration)# 音符间短暂停顿，让旋律更清晰 (约 30ms)buzzer.duty_u16(0)time.sleep_ms(30)try:print("开始播放：小星星...")print(f"速度：{BPM} BPM | 引脚：GP{BUZZER_PIN}")while True:for note, beats in SONG:play_note(note, beats)print("一曲完毕，2 秒后重复...")time.sleep(2)except KeyboardInterrupt:print("用户停止播放。")finally:# 程序彻底退出时才关闭蜂鸣器buzzer.deinit()print("蜂鸣器已关闭。")