Hello,
Although there seems to be endless information on the internet on using an Arduino board with Pure-Data, I haven't found any info that will make it work for me... So, I'm seeking for some help.

So I'm trying to use my Arduino board to read galvanic skin response. I've got that nearly working. Where I'm having trouble is getting the data into PD in the correct format.
Here is the code I have for my Arduino:
// Arduino Code
int sensorPin = A0;
int sensorValue = 0;

void setup() {
Serial.begin(9600);
}

void loop() {
float conductance = getVoltage(sensorPin);
Serial.println(conductance);
Serial.write(conductance);
delay(1000);
}

float getVoltage(int pin){
return (analogRead(pin));
}
// End Arduino Code.

I'm using the comport object in PD. And I am receiving Data which is analogous to what I'm doing on the board. But I can't understand exactly what it is reading. Here is the link to my PD patch: http://www.sendspace.com/file/n81jlj
So Firstly, the Numbers keep jumping around, and secondly I'm not sure what those numbers are. What I'd like them to be is the individual analog inputs of my Arduino. But they clearly aren't as they all change when I play around with my arduino board. Also they seem to range between 0 and 255, whereas my Arduino reads the data as 10bits...

Any sugestions!?
Thank you,
Niko.

Have you considered using pduino and loading standard firmata onto your arduino, instead of your custom code?

@galvanicdude said:

But they clearly aren't as they all change when I play around with my arduino board.

How do you 'play' with it? If you're touching the board with your hands, the values will jump around because of your bio-electricity.

I have, but I'm not sure how to do it. When I follow instructions it doesn't seem to work... I'm giving it an other try.

@danijel said:

@galvanicdude said:

But they clearly aren't as they all change when I play around with my arduino board.

How do you 'play' with it? If you're touching the board with your hands, the values will jump around because of your bio-electricity.

Well not if its grounded properly. I've got fairly steady values in arduino-compiler's serial monitor.
The values jump around in PD because I'm receiving the data in bursts. So when I just link the 'comport' object to a simple number object I get a random value from that burst. Where I'm having trouble is single out the only value I want.

The idea is less to play the board with your skin moisture, but to set up a biofeedback loop: informing your conscious mind through sound (generated by PD) of innate/unconscious behavior of your body!

@galvanicdude said:

I have, but I'm not sure how to do it. When I follow instructions it doesn't seem to work... I'm giving it an other try.

Load the standard firmata onto the board (make sure you have Arduino 0019 or later), then download the appropriate firmata_test (depending on your platform). It's a program that will allow you to read the values from the pins directly. Once you make sense out of that, close the firmata_test, load up Pd and try to read the same values using pduino's test patch. If that is good too, then try to read from your own patch.

@galvanicdude said:

The idea is less to play the board with your skin moisture, but to set up a biofeedback loop: informing your conscious mind through sound (generated by PD) of innate/unconscious behavior of your body!

What sensor are you using for that?

I see a reference to Onyx Ashanti in your code - are you Onyx?

@danijel said:

I see a reference to Onyx Ashanti in your code - are you Onyx?

Haha no, just quick notes I took while talking to a friend.

Hi,
Thank you for your help, I resorted as you suggested to use someone else patch rather than try and do it myself. I'm using the Simple Message System which seems to work quite well.

Everytime I use a piece of Open Source code, I feel like I'm skipping on learning how to do things myself.... But there is only so much a man can do during his lifetime