Best command to use for activating a passive buzzer with a frequency

Using Arduino Programming Questions
1

Hi,
I am trying to find out the best command/function i can use to work with my piezo buzzer i am using. I want to be able to use PWM Features so the tone command is out of the picture which is a shame because it is the simplest one out of the options.

I am trying to get the buzzer to work with a digitalWrite function, but I cannot seem to get anywhere with it. It just makes a tiny buzzing sound. I was thinking it was because there was no frequency defined to that command but i am not sure how to do it with that command.

After this attempt i had tried the analogWrite function. This had worked but seems quite quiet, and wasnt sure how to change or find out the frequency it is running at.

analogWrite(buzzPin,100);
delay(200);
analogWrite(buzzPin,0);
delay(200);

This is the layout i had used in both digital and analogue, as i mentioned before, the analogue function only worked.

If you have any questions you need ask please do.

The buzzer is from Murata and i am pretty sure this is the part number ( PKM13EPYH4002-B0 )

2

Use the BlinkWithoutDelay principle with a very short period to drive the output without blocking free running of the code

3

There is the toneAC and toneAC2 library. They are nominally functionally identical except toneAC2 uses timer2 which may solve your PWM feature conflict.

4

Try this..


blinker  mrTone(3,2.5,5);  // Pin number, pulseMs, periodMs
timeObj  toneTimer(1000);  // Timer for xMs


void setup(void) {
   mrTone.setOnOff(true);  // Fire up the tone.
}

void loop(void) {

   idle();                       // Run background things, like the blinker.
   if (toneTimer.ding()) {       // If the timer has expited (**ding!**)..
      mrTone.setOnOff(false);    // Shut off the tone.
   }
}

You'll need to grab LC_baseTools from the library manager to compile it.

Good luck!

-jim lee

5

So toneAC uses pwm features too?

6

ToneAC uses a timer to generate the output signal without program involvement after it is configured. In this sense it is the same as Tone. However, there is a second version of the library, ToneAC2 that uses a different timer.

So if your issue is a conflict between the timer used by Tone, ToneAC2 is a readily available library that may resolve the issue by virtue of using a different timer.

7

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