Minim volume control using potentiometer

Processing Electronics (Arduino, etc.)
1

Hi peeps!

So when my game starts the music does also but id like to be able to control the volume of the music with a potentiometer.

I have sound.setGain(0); working in processing and I have the output of the potentiometer being sent over the serial port I just don’t know how to connect the two in Processing.

I have been looking online for tutorials or other forums but I can’t find any that help with this if anyone could point me in the right direction it would be great!

2

You want to get the Output from the Arduino over to Processing via Serial? Then you have to use the Serial library.

3

No i have the output already being sent over i just dont know how to use the output in processing to change sound.setGain() when using the potentiometer.

4

Uhm?
So for convenience, you have this as Code, right? :

String output; // you might have already converted that to a float

// and you have the method

sound.setGain(0);

//now you want that 0 to become the value of the output, right?...

//then just use 
sound.setGain(float(output)); //or just output if you already converted it to float before
5

The arduino part provides a value within a range which depends in the resolution of your arduino input and the resolution of your source, the potentiometer in this case. Let’s say you have an 8 bit resolution meaning your potentiometer will take values from 0 to 2^8-1 or 0…255. I believe the setGain() takes a value from 0 to 1, 1 to be the maximum volume. You need to map the range of your arduino to the range of your Sound object. For this, check the handy map function: https://processing.org/reference/map_.html

final float ARDUINO_MIN=0;
final float ARDUINO_MAX=255;
final float GAIN_MIN=0;
final float GAIN_MAX=1.0;
float newVolAmplitude = map(arduinoIn, ARDUINO_MIN,ARDUINO_MAX, GAIN_MIN,GAIN_MAX);
sound.setGain(newVolAmplitude );

Kf

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