narner

I'm wanting to use the Max communication patch from Bare Conductive (

https://github.com/BareConductive/Max-MSP-Touch-Board-communication)

 to map proximity with the Touch Board, similar to this Arduino code from Bare Conductive (

https://github.com/BareConductive/prox-volume).

However, I've not been able to determine what parameters in the Max communication patch would correspond to proximity - anyone have any insight? Or better yet, a modified example patch?

I'm wanting to use the Max communication patch from Bare Conductive (https://github.com/BareConductive/Max-MSP-Touch-Board-communication) to map proximity with the Touch Board, similar to this Arduino code from Bare Conductive (https://github.com/BareConductive/prox-volume). 

However, I've not been able to determine what parameters in the Max  communication patch would correspond to proximity - anyone have any insight? Or better yet, a modified example patch? 

bare-conductive-touch-board-proximity-sensing

Here's what I do. And I use the Datastream.ino Arduino sketch on the touchboard.

You'll need to do some scaling on the values - I capture the max & min incoming values & then use those to rescale the touchboard data to 0.-1. .

Here's what I do.  And I use the Datastream.ino Arduino sketch on the touchboard.
You'll need to do some scaling on the values - I capture the max & min incoming values  & then use those to rescale the  touchboard data to 0.-1. .

Ok, I kind of follow - the issue I seem to be having is I'm only seeing any sort of proximity data when my hand is touching my sensor when using the Max examples, but using the Arduino sketch I mentioned above , the proximity readings tend to be much smoother...any theories at all?

Ok, I kind of follow - the issue I seem to be having is I'm only seeing any sort of proximity data when my hand is touching my sensor when using the  Max examples, but using the Arduino sketch I mentioned above , the proximity readings tend to be much smoother...any theories at all?


I added the code below to the DataStream Arduino sketch, which was taken from the "prximity-mp3" example.

#define filterWeight 0.3f // 0.0f to 1.0f - higher value = more smoothing

// read the difference between the measured baseline and the measured continuous data

int reading = MPR121.getBaselineData(PROX_ELECTRODE)-MPR121.getFilteredData(PROX_ELECTRODE);

// constrain the reading between our low and high mapping values

unsigned int prox = constrain(reading, LOW_DIFF, HIGH_DIFF);

// implement a simple (IIR lowpass) smoothing filter

lastProx = (filterWeight*lastProx) + ((1-filterWeight)*(float)prox);

// map the LOW_DIFF..HIGH_DIFF range to 0..254 (max range for MP3player.setVolume())

uint8_t proximityOutput = (uint8_t)map(lastProx,LOW_DIFF,HIGH_DIFF,0,-60);

And then the Max code below to the Bare Conductive Touch Board Communication patch to get that new proximity information:

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However, the data coming into the Max patch seems to be really slow...I'm only getting any sort of proximity reading if my hand is directly touching my electric paint sensor.

I added the code below to the DataStream Arduino sketch, which was taken from the "prximity-mp3" example. 

     // mapping and filter definitions
   #define LOW_DIFF 0
   #define HIGH_DIFF 50
   #define filterWeight 0.3f // 0.0f to 1.0f - higher value = more smoothing
   float lastProx = 0;

    ///PRINT PROXIMITY VALUE FOR ELECTRODE 0 

    // read the difference between the measured baseline and the measured continuous data
    int reading = MPR121.getBaselineData(PROX_ELECTRODE)-MPR121.getFilteredData(PROX_ELECTRODE);

    // constrain the reading between our low and high mapping values
    unsigned int prox = constrain(reading, LOW_DIFF, HIGH_DIFF);

    // implement a simple (IIR lowpass) smoothing filter
     lastProx = (filterWeight*lastProx) + ((1-filterWeight)*(float)prox);

     // map the LOW_DIFF..HIGH_DIFF range to 0..254 (max range for MP3player.setVolume())
     uint8_t proximityOutput = (uint8_t)map(lastProx,LOW_DIFF,HIGH_DIFF,0,-60);

     Serial.print("PROXIMITY: ");
     Serial.print(proximityOutput);
     Serial.println();`

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However, the data coming into the Max patch seems to be really slow...I'm only getting any sort of proximity reading if my hand is directly touching my electric paint sensor.


Bare Conductive Touch Board + proximity sensing