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Tangible Image viewer

kilian.moser's picture
Wed, 09/28/2011 - 06:52 — kilian.moser

Our tangible interface makes it possible to display, swipe through, turn and zoom into images tangibly. We used Arduino, some physical parts and a bit of VB.NET code. (VB code is attached as a zip file)

Arduino code:

 

 
int zoomSensor = A0;    // select the input pin for the potentiometer
int rotSensor = A1;
int swipeSensor1 = A2;
int swipeSensor2 = A3;
 
int zoomValue = 0; 
int rotValue = 0;
int swSens1Val = 0, swSens2Val = 0;
int threshold = 80, swipeThresh = 400;
 
int bufZoom = 0, bufRot = 0;
int JITTER = 5, SMOOTH = 30;
 
const int smoothLength = 20;
int ZOOMSMOOTHER[smoothLength] = {0};
int ROTSMOOTHER[smoothLength] = {0};
 
// swipe variables
int swLcount = 0, swRcount = 0, swCountMax = 500;
int blockCounter = 0, blockMax = 100;
int lightOffset = 0;
 
 
void setup() {
  // declare the ledPin as an OUTPUT:
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
  swSens1Val = analogRead(swipeSensor1);
  swSens2Val = analogRead(swipeSensor2);
  lightOffset = swSens2Val - swSens1Val;
}
 
void loop() {
  // read the value from the sensors:
  zoomValue = analogRead(zoomSensor);     
  rotValue = analogRead(rotSensor);
  swSens1Val = analogRead(swipeSensor1);
  swSens2Val = analogRead(swipeSensor2) - lightOffset;
  
  // catch swipe to right
  if(swSens1Val < swipeThresh){
    if (swLcount == 0) swLcount = swCountMax;
    else if(swLcount > 0) swLcount--;
  }
  else{
    if (swLcount < swCountMax) swLcount++;
  }
  if(swSens2Val < swipeThresh){
 
    if (swRcount == 0) swRcount = swCountMax;
    else if(swRcount > 0) swRcount--;
  }
  else{
    if (swLcount < swCountMax) swLcount++;
  }
  
  if(swSens1Val < swipeThresh && swSens2Val < swipeThresh){
    if(blockCounter == 0){
      if(swLcount <= swRcount){
        Serial.print("R,0;");
        swLcount = 0;
        swRcount = 0;
      }
      else{
        Serial.print("L,0;");
        swLcount = 0;
        swRcount = 0;
      }
      blockCounter = blockMax;
    }
  }
  if(blockCounter > 0) blockCounter--;
  
  
  // print values (improve jittering)
  if((zoomValue != bufZoom) || 
          (rotValue < (bufRot-JITTER) || rotValue > (bufRot+JITTER))){
    zoomValue = smoothZoom(zoomValue);
    rotValue = smoothRotation(rotValue);
    bufZoom = zoomValue;
    bufRot = rotValue;
 
    Serial.print(zoomValue, DEC);
    Serial.print(",");
    Serial.print(rotValue, DEC);
    Serial.print(";");  
  }
}
 
// these two functions smooth zooming and rotation with simple mean
int smoothZoom(int val){
  unsigned int sum = 0;
  
  memmove(ZOOMSMOOTHER+1, ZOOMSMOOTHER, (smoothLength-1)*2);
  *ZOOMSMOOTHER = val;
  
  for(int i=0; i<smoothLength; i++){
    sum += ZOOMSMOOTHER[i];
  }
  return (sum / smoothLength);
}
 
int smoothRotation(int val){
  unsigned int sum = 0;
  
  memmove(ROTSMOOTHER+1, ROTSMOOTHER, (smoothLength-1)*2);
  *ROTSMOOTHER = val;
  
  for(int i=0; i<smoothLength; i++){
    sum += ROTSMOOTHER[i];
  }
  return (sum / smoothLength);
}
 
 
 
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