supercollider firmata 2

Submitted by f0 on

supercollider

+2 years ago i put up a simple example of how to use firmata with arduino and supercollider here. that code still work but it only show how to read a single analog input on the arduino.

here is how one can read both A0 and A1 and map those to synth parameters in supercollider...

//how to read pins A0 and A1 with SCFirmata...
//tested with Arduino1.8.0 and SC3.8.0
//first in Arduino IDE:
//  * select File / Examples / Firmata / StandardFirmata
//  * upload this example to an arduino
//then in SC install the SCFirmata classes
//  * download zip file https://github.com/blacksound/SCFirmata
//  * extract files and put them in your sc application support directory
//  * recompile sc

SerialPort.devices;
d= SerialPort.devices[0]; // or d= "/dev/tty.usbserial-A1001NeZ" - edit number (or string) to match your arduino
f= FirmataDevice(d);//if it works it should post 'Protocol version: 2.5' after a few seconds

s.boot

(
Ndef(\snd, {|freq1= 400, freq2= 500, amp= 0.5| SinOsc.ar([freq1, freq2].lag(0.08), 0, amp.lag(0.08)).tanh}).play;
f.reportAnalogPin(0, true);      //start reading A0
f.reportAnalogPin(1, true);      //start reading A1
f.analogPinAction= {|num, val|
        [num, val].postln;
        switch(num,
                0, {
                        Ndef(\snd).set(\freq1, val.linexp(0, 1023, 400, 800)); //A0 mapped to freq1
                },
                1, {
                        Ndef(\snd).set(\freq2, val.linexp(0, 1023, 400, 800)); //A1 mapped to freq2
                }
        );
};
)

(
Ndef(\snd).stop;
f.reportAnalogPin(0, false);     //stop reading A0
f.reportAnalogPin(1, false);     //stop reading A1
f.end;
f.close;
)

and to read all six analog inputs (A0-A5) one can do...

SerialPort.devices;
d= SerialPort.devices[0]; // or d= "/dev/tty.usbserial-A1001NeZ" - edit number (or string) to match your arduino
f= FirmataDevice(d);//if it works it should post 'Protocol version: 2.5' after a few seconds

s.boot
~numberOfAna= 6;  //number of analog inputs (here A0-A5)

(
var freqsArr= 0!~numberOfAna;
Ndef(\snd2, {|amp= 0.5| Splay.ar(SinOsc.ar(\freqs.kr(freqsArr, 0.05), 0, amp.lag(0.08)).tanh)}).play;
~numberOfAna.do{|i|
        f.reportAnalogPin(i, true);      //start reading A0-Anum
};
f.analogPinAction= {|num, val|
        [num, val].postln;
        freqsArr.put(num, val);
        Ndef(\snd2).setn(\freqs, freqsArr);
};
)

(
Ndef(\snd2).stop;
~numberOfAna.do{|i|
        f.reportAnalogPin(i, false);     //stop reading A0-Anum
};
f.end;
f.close;
)