Made during PIFcamp 2017, this textile sensor detects the impact of a conductive pendulum slapping against the wristband when the wrist is twisted back and forth in a flicking action. The conductive pendulum is made from a small heavy stone collected by the Soca river that has been sewn into a stretch conductive pouch.
In this example video the contact of flicking triggers a sound sample to be played, and the impact/force/pressure of the flick determines the volume of the playback. While the pressure sensor works, the pressure is always related to the speed of flicking, so in a second iteration I would like to only have a contact switch and calculate the duration between flicks to determine impact.
Flickr set >> https://www.flickr.com/photos/plusea/albums/72157687419331675
conductive fabric underneath the piezoresistive fabric of the pressure sensor:
wristFlickDrum Code
>>
reads incoming serial values [0, 1023] and triggers a sound file
when they are bellow a set threshold.
the volume [-20, 20] of the playback depends on the incoming value.
*/
import processing.serial.*;
import ddf.minim.*;
int maxNumberOfSensors = 1; // arduino has 6 analog inputs, so I chose 6
Serial myPort; // The serial port
int[] sensorValues = new int[maxNumberOfSensors]; // array of previous values
Minim minim;
AudioSample sample;
AudioPlayer player;
void setup () {
size(400, 400);
//size(800, 600, P3D);
println(Serial.list());
String portName = Serial.list()[5];
myPort = new Serial(this, “/dev/tty.usbmodem1411”, 9600);
myPort.clear();
myPort.bufferUntil(‘\n’);
background(0);
smooth();
minim = new Minim(this);
sample = minim.loadSample( “ding.wav”, 512);
}
void draw () {
println(sensorValues[0]);
if (sensorValues[0] < 900) {
float volume = constrain(sensorValues[0], 20, 900);
volume = map(volume, 20, 900, 20, -20);
sample.setGain(volume);
sample.trigger();
}
}
void serialEvent (Serial myPort) {
// get the ASCII string:
String inString = myPort.readStringUntil('\n');
// if it's not empty:
if (inString != null) {
// trim off any whitespace:
inString = trim(inString);
// convert to an array of ints:
int incomingValues[] = int(split(inString, ","));
if (incomingValues.length <= maxNumberOfSensors && incomingValues.length > 0) {
for (int i = 0; i < incomingValues.length; i++) {
sensorValues[i] = incomingValues[i];
}
}
}
}
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