Potentiometer controlling voltage to buzzer.

How do I code to use a potentiometer to control the voltage rating going to a buzzer? Thus, changing the tone of the buzzer.

There is a example code on the net that uses a potentiometer to fade an LED. I tried modifying that code for my aim, but I was unsuccessful. I tried to make the range of the potentiometer 300-900 volts though it just came out as ~ 25 volts no matter where the potentiometer was.

Here is the example code:

int led = 9;           // the PWM pin the LED is attached to
int brightness = 0;    // how bright the LED is
int fadeAmount = 5;    // how many points to fade the LED by

// the setup routine runs once when you press reset:
void setup() {
  // declare pin 9 to be an output:
  pinMode(led, OUTPUT);

// the loop routine runs over and over again forever:
void loop() {
  // set the brightness of pin 9:
  analogWrite(led, brightness);

  // change the brightness for next time through the loop:
  brightness = brightness + fadeAmount;

  // reverse the direction of the fading at the ends of the fade:
  if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
  // wait for 30 milliseconds to see the dimming effect

That code doesn't even use a potentiometer, it just up-fades and down-fades over and over.

Oh! That probably contributed to why it didn’t work… I still have no clue how to do it though. Thanks for pointing that out.

Try this one instead

I just had a quick look at it. I think I understand it. I'll try to make it work tomorrow.

Thanks very much for the quick response!

I'm not sure what's required to hook up a buzzer in place of that led, so best you investigate that before you try the buzzer.