AD8232 Heart Rate Monitor

We’ll connect five of the nine pins on the board to your Arduino.

The five pins you need are labeled GND, 3.3v, OUTPUT, LO-, and LO+.

The Device is as default is three-electrode circuit also in DC lead off detecion Mode.

+IN and -IN are connected with two 10M to the 3.3v.
AC/DC comnected to the Ground.

Connecting Headers to the Board

ad8232_UNOBy this point, you should have the hardware connected and ready.

DC lead off detection Mode

LOD- or LOD+ pins will be high when the input are not connected.







Original Program for AD8232 Heart Rate sensor.

Note: The code can sketch only through the processing-2.2.1 release.

The device works but results was not so great.



Here my preprocessing program (processing-2.2.1 release)

import processing.serial.*;

Serial myPort; // The serial port
int xPos = 1;  // horizontal 
int yPos = 100;
float yOld = 0;
float yNew = 0;
float inByte = 0;
int lastS = 0;
PFont f;
void setup () {
  size(1200, 500);
  // Open whatever port is the one you're using.
  myPort = new Serial(this, Serial.list()[0], 9600);
void draw () {
  int s = second();
  PFont f = createFont("Arial",9,false);
  if (s != lastS){
    stroke(0xcc, 0xcc, 0xcc);
    line(xPos, yPos+10, xPos, yPos+30);
    text(s + " Sec.", xPos+5, yPos+30);
    lastS = s;
void mousePressed(){
  save(lastS + "-heart.jpg");
void serialEvent (Serial myPort) {
  String inString = myPort.readStringUntil('\n');
  if (inString != null) {
    inString = trim(inString);
    if (inString.equals("!")) {
      stroke(0, 0, 0xff); // blue
      inByte = 1023; // middle of the ADC range (Flat Line)
    } 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);
    yNew = inByte;
    line(xPos-1, yPos-yOld, xPos, yPos-yNew);
    yOld = yNew;
    // at the edge of the screen, go back to the beginning:
    if (xPos >= width) {
      xPos = 1;
      if (yPos > height-200){
        xPos = 1;
    } else {
      // increment the horizontal position:

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