Poteniometer Volume Controller (Mapping the Volume on Mac)

Using Arduino Audio
1

Hi everyone, I have been trying to make a small media control hub and 1 of the features I wanted to make was volume control for my Mac. as I read online I saw people successfully achieve this and I mimicked versions of code to achieve similar results. Unfortunately for me I was unable to replicate them but I noticed one of them said that the audio was mapped for Windows.

To further explain my potentiometer uses about 50-60% to actually control the volume. the space above the max volume does nothing, and the space below starts inverting an adding my volume when I go below mute.

Here is version 1 and then Version 2 is below broken up by a line of dashes or "-"

My theory is the section where on both codes is said as " map(Aval, 0, 1023, 0, 55);" I think this section and the area around it might be causing my problem but adjusting these values hasn't helped me much, as far as I know its there to set up the amount of steps?

Im curious to hear your opinions and feedback and any help would be greatly appreciated.

Big thanks

//Version 1
#include <HID.h>                            
#include <HID-Project.h>                    
#include <HID-Settings.h>
#include <math.h>                           
#define REVERSED false                      

int Aval = 0;
int val = 0;
int volume = 0;
int potbuffer = 4;

void setup() {
  Consumer.begin();                        
  delay(1000);                              
  for(int a = 0; a < 52; a++) {
    Consumer.write(MEDIA_VOLUME_DOWN);      
  }
}

void loop() {
  if (analogRead(1) >= Aval+potbuffer || analogRead(1) <= Aval-potbuffer) { Aval = analogRead(1); }                                    
  val = map(Aval, 0, 1023, 0, 55);                                                                                                     
  val *= 2;                                                                                                                            
  if(REVERSED) {                                                                                                                      
    val = 110 - val;
  }

  while (volume != val) {                                                                                                              
    if (volume < val) { Consumer.write(MEDIA_VOLUME_UP); volume += 2; }                                                               
    if (volume == val) { break; }                                                                                                    
    if (volume > val) { Consumer.write(MEDIA_VOLUME_DOWN); volume -= 2; }                                                            
}

//-----------------------------------------------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------------------------------------------

//Version 2

#include  "HID-Project.h"

int pot_value;
int old_volume = 0;

void setup() {
  pinMode (A1, INPUT);

  Consumer.begin();

}

void loop() {
  pot_value = analogRead(A1);
  pot_value = map(pot_value, 1023, 0, 0, 50);

  if (pot_value != old_volume)  {
    if (pot_value > old_volume)  {
      Consumer.write (MEDIA_VOLUME_UP);
      old_volume = pot_value;
    }
    else if (pot_value < old_volume)  {
      Consumer.write (MEDIA_VOLUME_DOWN);
      old_volume = pot_value;
    }
  }

}
2

You should make two different code blocks.

This seems to invert pot_val or make it go negative.

3

Sorry, I'm a little confused about that. From what I can understand I should split them up into:

pot_value = map(pot_value, 0, 50);
pot_value = map(pot_value, 1023, 0,);

I'll look a little into the library I'm using and see what other information I can find but I'll definitely try my best, if you have any other tips then that would be great.
Thank you

4

This part of your code looks right...

If you want to invert this, you would invert the output min and max (55, 0):

val = map(Aval,  0, 1023, 55, 0);

In pseudo-code, it is:

val = map (Aval, inputMIN, inputMAX, outputMIN, outputMAX);

"... two different code blocks..." meant, put the sketch labeled "version 1" into one code block, and "version 2" into another code block.

1 Like
5

Thank you very much for the info on how the mapping works, ill try out some different sets of values to see what suits my mac best.

For the code I already have them set up in 2 different sketches I just combined them here for the sake of convenience but I appreciate the concern and help.

Ill need some time to try it out but ill inform you if I get it to work.
Big Thanks

6

Sorry for the late update but I have gotten it to work after playing around with the values primarily for the output to get everything set up and switched over to a different pin. I still have some dead zone once I reach 100% volume but its nothing I cant deal with.

I appreciate all your help and tips it helped me finish my little media hub project.

Thank you

1 Like
7

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