Lab 4 - Cactus Dance

Submitted by fchasen on Tue, 02/26/2013 - 21:34

Description

I placed the cactus above the Force sensor. It is sensitive enough to detect even light touches to the leaves. Each leaf has a slightly different amount of pressure. I visualized these touches by constructing a L-system depiction of the cactus flowering. The virtual cactus gets more wild the harder one presses. Continually pressing the cactus causes it to dance around. 

 

Components Used

  • Arduino Uno
  • Breadboard
  • 10 ohm resistor
  • Plastic Cactus
  • Felt pads
  • Force Sensing Resistor

 

Code




	
// Fred Chasen: Cactus





	// Based on - http://www.openprocessing.org/sketch/7150 : Alasdair Turner 2007



	// And - Arduino Ball Paint: Tod E. Kurt



	 



	import processing.serial.*;



	// Change this to the portname your Arduino board



	//String portname = "/dev/tty.usbserial-A4001nLJ"; // or "COM5"



	String portname = "/dev/tty.usbmodemfd121";



	Serial port;



	String buf="";



	int cr = 13;  // ASCII return   == 13



	int lf = 10;  // ASCII linefeed == 10



	 



	float wildness = 6.0;



	float max = 25;



	 



	void setup()



	{



	  size(1200,750);



	  smooth();



	  noLoop();



	  port = new Serial(this, portname, 9600); 



	}



	 



	void draw()



	{



	  background(232,232,232);  //221,218,208



	  strokeWeight(60);



	  



	  //-- Round caps



	  strokeCap(ROUND);



	  



	  //-- offset top



	  translate(width/2,height + 212);



	  branch(0);



	  



	  //-- draw pot



	  strokeWeight(75);



	  stroke(189,175,145);



	  //strokeCap(SQUARE);



	  line( -width/2 + 400, height - 1025, width/2 - 400, height - 1025);



	  



	  fill(189,175,145);



	  noStroke();



	  rect( -width/2 + 400, height - 1050, 400, 200);



	}



	 



	void branch(int depth)



	{



	  



	  //-- Fade colors  



	  stroke(92 + (depth * 2), 117 - (depth * 2), 94 + (depth * 3));



	 



	    if (depth < 13) {



	      



	      //-- Added to create leaves



	      if(depth == 12){



	        noStroke();



	        fill(92 + (depth * 3), 117 - (depth * 2), 94 + (depth * 4));



	        ellipse(10, 10, 100, -height/3);



	      }else{



	        line(0,0,0,-height/3 );



	      }



	      



	      pushMatrix();



	      {



	        translate(0,-height/5);



	        rotate(random(-PI/wildness,PI/wildness));



	        scale(0.88);



	        branch(depth + 1);



	      }



	      popMatrix();



	      pushMatrix();



	      {



	        translate(0,-height/3);



	        rotate(random(-PI/wildness,PI/wildness));



	        scale(0.7);



	        branch(depth + 1);



	      }



	      popMatrix();



	    }



	}



	 



	void mouseClicked()



	{



	  



	  redraw();



	}



	 



	void keyReleased() {



	  if (key == CODED) {



	    if (keyCode == UP) {



	      if(wildness > 3){



	        wildness -= .1;



	      }



	      redraw();    



	    } else if (keyCode == DOWN) {



	      if(wildness < 10){



	        wildness += .1;



	      }



	      redraw();



	    } 



	  }



	  



	}



	 



	// called whenever serial data arrives



	void serialEvent(Serial p) {



	  int c = port.read();



	  if (c != lf && c != cr) {



	    buf += char(c);



	  }



	  if (c == lf) {



	    int val = int(buf);



	    println("val="+val); 



	    



	    // 7 - 3



	    if(val > 0){



	      wildness = 7 - norm(val, 0, max) * 4;



	      redraw();



	    }



	    



	    buf = "";



	  }



	}



	 


 


 


cactus-sensor


cactus.png



 
 
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