蜂鸣器

有源蜂鸣器

from machine import Pin
import time


p04 = Pin(4, Pin.OUT)

for i in range(10):
    p04.value(1)  # 不响
    time.sleep(0.2)
    p04.value(0)  # 响
    time.sleep(0.2)

p04.value(1)  # 关闭

无源蜂鸣器

from machine import Pin
from machine import PWM
from time import sleep_ms


class BUZZER:
    def __init__(self, sig_pin):
        self.pwm = PWM(Pin(sig_pin, Pin.OUT))

    def play(self, melodies, wait, duty):
        for note in melodies:
            print("note:{}".format(note))
            if note:
                self.pwm.freq(note)
            self.pwm.duty(duty)
            sleep_ms(wait)
        # 暂停PWM，将占空比设置为0
        self.pwm.duty(0)


# 音符与对应的的频率
B0 = 31
C1 = 33
CS1 = 35
D1 = 37
DS1 = 39
E1 = 41
F1 = 44
FS1 = 46
G1 = 49
GS1 = 52
A1 = 55
AS1 = 58
B1 = 62
C2 = 65
CS2 = 69
D2 = 73
DS2 = 78
E2 = 82
F2 = 87
FS2 = 93
G2 = 98
GS2 = 104
A2 = 110
AS2 = 117
B2 = 123
C3 = 131
CS3 = 139
D3 = 147
DS3 = 156
E3 = 165
F3 = 175
FS3 = 185
G3 = 196
GS3 = 208
A3 = 220
AS3 = 233
B3 = 247
C4 = 262
CS4 = 277
D4 = 294
DS4 = 311
E4 = 330
F4 = 349
FS4 = 370
G4 = 392
GS4 = 415
A4 = 440
AS4 = 466
B4 = 494
C5 = 523
CS5 = 554
D5 = 587
DS5 = 622
E5 = 659
F5 = 698
FS5 = 740
G5 = 784
GS5 = 831
A5 = 880
AS5 = 932
B5 = 988
C6 = 1047
CS6 = 1109
D6 = 1175
DS6 = 1245
E6 = 1319
F6 = 1397
FS6 = 1480
G6 = 1568
GS6 = 1661
A6 = 1760
AS6 = 1865
B6 = 1976
C7 = 2093
CS7 = 2217
D7 = 2349
DS7 = 2489
E7 = 2637
F7 = 2794
FS7 = 2960
G7 = 3136
GS7 = 3322
A7 = 3520
AS7 = 3729
B7 = 3951
C8 = 4186
CS8 = 4435
D8 = 4699
DS8 = 4978

# 第一首，超级马里奥乐谱
mario = [
    E7, E7, 0, E7, 0, C7, E7, 0,
    G7, 0, 0, 0, G6, 0, 0, 0,
    C7, 0, 0, G6, 0, 0, E6, 0,
    0, A6, 0, B6, 0, AS6, A6, 0,
    G6, E7, 0, G7, A7, 0, F7, G7,
    0, E7, 0, C7, D7, B6, 0, 0,
    C7, 0, 0, G6, 0, 0, E6, 0,
    0, A6, 0, B6, 0, AS6, A6, 0,
    G6, E7, 0, G7, A7, 0, F7, G7,
    0, E7, 0, C7, D7, B6, 0, 0,
]

# 第二首，jingle bells
jingle = [
    E7, E7, E7, 0,
    E7, E7, E7, 0,
    E7, G7, C7, D7, E7, 0,
    F7, F7, F7, F7, F7, E7, E7, E7, E7, D7, D7, E7, D7, 0, G7, 0,
    E7, E7, E7, 0,
    E7, E7, E7, 0,
    E7, G7, C7, D7, E7, 0,
    F7, F7, F7, F7, F7, E7, E7, E7, G7, G7, F7, D7, C7, 0
]

# 初始化蜂鸣器对象
buzzer = BUZZER(4)

print("播放 超级马里奥")
buzzer.play(mario, 150, 512)
sleep_ms(1000)

print("播放 jingle bells.")
buzzer.play(jingle, 250, 512)
sleep_ms(1000)