M5Stack Passive Buzzer UNIT

Core2_BuzzerTest00.ino

#include <Arduino.h>
#include<M5Core2.h>
#define buzzer_pin 26
int freq = 4000;//音の高さ
int ledChannel = 0;
int resolution = 10;
int vol=512;//Volume 0-1024(10it)
int i,j,k;
int t0,tb,tw;
uint8_t flags;
void setup() {
  M5.begin();
  vol=512;
  ledcSetup(ledChannel, freq, resolution);  //PWM CH0,Freuency4000,10Bit 
  ledcAttachPin(buzzer_pin, ledChannel); //PWM Pin26,PWM CH0 
  ledcWrite(ledChannel, vol);  //PWM Duty
  t0=millis();
  tb=30;
  tw=2000;
  
}
void loop() {
      //Serial.printf("t0=%d, millis=%d\n\r",t0,millis());
    if(millis()-t0>10000){
        i++;
        i=i%3;
        t0=millis();
        if(i==0){
          flags=131;
          vol=512;
        }
         if(i==1){
          flags=67;
          vol=512;
        }
         if(i==2){
          flags=1;
          vol=512;
        }
    }
    Abeep(flags,vol);

}

//ブザーSub 　(flag値,周波数,Duty,駆動時間,休止時間）　
void Abeep(uint8_t flag,int vol){
  if (flag<67){
    flag=1;
  }
  switch(flag) {
     case 131:
         freq= int(3000);
         ledcSetup(ledChannel, freq, resolution);  //PWM CH0,Freuency4000,10Bit 
         tb=20;
         tw=1000;
         Serial.printf("flag=%d,freq=%d,vol=%d\n\r",flag,freq,vol);
         break;
     case 67:
        freq= int(1000);
        ledcSetup(ledChannel, freq, resolution);  //PWM CH0,Freuency4000,10Bit 
        tb=400;
        tw=1000;
        Serial.printf("flag=%d,freq=%d,vol=%d\n\r",flag,freq,vol);
        break;
     case 1:
        freq= int(200);
        ledcSetup(ledChannel, freq, resolution);  //PWM CH0,Freuency4000,10Bit 
        tb=700;
        tw=1000;
        Serial.printf("flag=%d,freq=%d,vol=%d\n\r",flag,freq,vol);
        break;
    }
    //===========Beep Action===================================
    ledcWrite(0, vol);  //Output PWM START at Volume vol
    delay(tb);
    ledcWrite(0, 0);  //Output PWM. STOP at Volume 0
    delay(tw);
    //==========================================================
    
}