Unit Buzzer

#include <Arduino.h>

#define buzzer_pin 26
int freq = 4000;
int ledChannel = 0;
int resolution = 10;

void setup() {
  ledcSetup(ledChannel, freq, resolution);  //Sets the frequency and number of counts corresponding to the channel.  设置通道对应的频率和计数位数
  ledcAttachPin(buzzer_pin, ledChannel); //Binds the specified channel to the specified I/O port for output.  将指定通道绑定到指定 IO 口上以实现输出
  ledcWrite(ledChannel, 512);  //Output PWM.  输出PWM
}

void loop() {
    ledcWrite(ledChannel, 512);  //Output PWM.  输出PWM
    delay(3000);
    ledcWrite(ledChannel, 0);  //Output PWM.  输出PWM
    delay(3000);
}