ECG sensor

Arduino Coding

/*

 * http://arduspot.blogspot.in/p/ecg-sensor.html

 */

 

int LO_plus = 10;

int LO_minus = 11;

void setup() 

{

  Serial.begin(9600);

  pinMode(LO_plus, INPUT); // Setup for leads off detection LO +

  pinMode(LO_minus, INPUT); // Setup for leads off detection LO -

}

void loop() 

{  

  if((digitalRead(LO_plus) == 1)||(digitalRead(LO_minus) == 1))

  {

    Serial.println('!');

  }

  else

  {

    Serial.println(analogRead(A0));

  }

  delay(1);

}

Processing (2.2.1) Coding

import processing.serial.*;

Serial myPort;        // The serial port

int xPos = 1;         // horizontal position of the graph

float height_old = 0;

float height_new = 0;

float inByte = 0;

void setup () {

  // set the window size:

  size(1000, 400);        

  // List all the available serial ports

  println(Serial.list());

  // Open whatever port is the one you're using.

  myPort = new Serial(this, Serial.list()[2], 9600);

  // don't generate a serialEvent() unless you get a newline character:

  myPort.bufferUntil('\n');

  // set inital background:

  background(0xff);

}

void draw () {

  // everything happens in the serialEvent()

}

void serialEvent (Serial myPort) {

  // get the ASCII string:

  String inString = myPort.readStringUntil('\n');

  if (inString != null) {

    // trim off any whitespace:

    inString = trim(inString);

    // If leads off detection is true notify with blue line

    if (inString.equals("!")) { 

      stroke(0, 0, 0xff); //Set stroke to blue ( R, G, B)

      inByte = 512;  // middle of the ADC range (Flat Line)

    }

    // If the data is good let it through

    else {

      stroke(0xff, 0, 0); //Set stroke to red ( R, G, B)

      inByte = float(inString); 

     }

     

     //Map and draw the line for new data point

     inByte = map(inByte, 0, 1023, 0, height);

     height_new = height - inByte; 

     line(xPos - 1, height_old, xPos, height_new);

     height_old = height_new;

    

      // at the edge of the screen, go back to the beginning:

      if (xPos >= width) {

        xPos = 0;

        background(0xff);

      } 

      else {

        // increment the horizontal position:

        xPos++;

      }

    

  }

}