4/23/2008

Actions Events Filtering

Using self-setting threshold to filter data and trigger event : heart beat.



Code:

arduino:

/* I AM ALIVE heart beat led
* by meng li based on the code by Jeff Gray - 2008
* ----------------
* Triggers a one time event when value goes over threshold,
* and a different trigger once the value goes back below the threshold
*/

int an1,an2 = 0;
int redLedPin =13;
boolean triggered = false;

void setup(){
Serial.begin(9600);
pinMode(redLedPin, OUTPUT); // set the red LED pin to be an output
// Serial.println("Starting");
}
void loop(){
// read analog value in
int an2 = analogRead(0);
Serial.print("Y");
Serial.println(an2,DEC);
//threshold
int an1= analogRead(5);
Serial.print("X");
Serial.println(an1,DEC);


if(an1 > an2 && !triggered){
triggered = true;
digitalWrite(redLedPin, HIGH); // turn off the red LED
}
if(an1 <= an2 && triggered){
triggered = false;
digitalWrite(redLedPin, LOW); // turn off the red LED
}
}

processing:

import processing.serial.*;

String buff = "";
int val = 0;
int NEWLINE = 10;
int xPos,yPos,zPos = 0;
int displaySize = 2;
int an1, an2, an3;
//an1 pot; an2 ir;

Serial port;

void setup(){
background(80);
size(800,600);
smooth();

port = new Serial(this, Serial.list()[1], 9600);
}

void draw(){
// new background over old
fill(80,5);
noStroke();
rect(0,0,width,height);

// wipe out a small area in front of the new data
fill(80);
rect(xPos+displaySize,0,50,height);

// check for serial, and process
while (port.available() > 0) {
serialEvent(port.read());
}

}


void serialEvent(int serial) {
print("A"); //header variable, so we know which sensor value is which
println(an1); //send as a ascii encoded number - we'll turn it back into a number at the other end
//Serial.print(10, BYTE); //terminating character

print("B"); //header variable, so we know which sensor value is which
println(an2); //send as a ascii encoded number - we'll turn it back into a number at the other end
//Serial.print(10, BYTE); //terminating character


if(serial != '\n') {
buff += char(serial);
}
else {
int curX = buff.indexOf("X");
int curY = buff.indexOf("Y");


if(curX >=0){
String val = buff.substring(curX+1);
an1 = Integer.parseInt(val.trim());

xPos++;
if(xPos > width) xPos = 0;

sensorTic1(xPos,an1);
}
if(curY >=0){
String val = buff.substring(curY+1);
an2 = Integer.parseInt(val.trim());

yPos++;
if(yPos > width) yPos = 0;

sensorTic2(yPos,an2);
}

// Clear the value of "buff"
buff = "";
}
}

void sensorTic1(int x, int y){
stroke(0,0,255);
fill(0,0,255);
ellipse(x,y,displaySize,displaySize);
}

void sensorTic2(int x, int y){
stroke(255,0,0);
fill(255,0,0);
ellipse(x,y,displaySize,displaySize);
} video

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