Heartrate Sensor - Simple Circuit

Arduino

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,"COM4", 9600); //local USB- port

}


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);

}


Heartrate Sensor - Circuit With Amplifier

Arduino

define mask 255 // kill top bits

int potPin = 0; // select the input pin for the pot

int ledPin = 13; // select the pin for the LEDLight-emitting diode

int val = 16706; // variable to store the value coming from the sensor

int val2 =0;

int a =0;

int b =0;

int beats[]= {0,0,0,0,0};// to track last five reads for a pattern

boolean beated = false;

//function dec

boolean getBioData();


void setup() {

pinMode(ledPin, OUTPUT); // declare the ledPin as an OUTPUT

Serial.begin(9600);

}


void loop() {

char check=' ';

val = analogRead(potPin); // read the value from the sensor

if (Serial.read() =='a'){ // check buffer for an 'a'

val2 = val;

b= val & mask;

a =((val2>>8) & mask); //just in case mask

delay(20);

// Serial.print("b"); // debug

// Serial.print(b);

Serial.print(a,BYTE);

Serial.print(b,BYTE);

if (getBioData()){ // call bio function

Serial.print('b',BYTE);

}

else Serial.print('n',BYTE);

}

}

boolean getBioData(){

int beatVal = analogRead(potPin); // read the value from the sensor

beats[4] = beatVal; // put in back of array

int beatDif = beats[5 - 1] - beats[0];

for (int i = 0; i < 5;i++){

beats[i] = beats[i+1]; // push zero out front

}

// check for beat

if ( beatDif > 10 && (beated != true)){

beated = true;

return true;

}

else if( beatDif < 2 ){

beated = false;

return false;

}

else return false;

}


Processing

import processing.serial.*;


Serial port; // Create object from Serial class

int val; // Data received from the serial port

int WIDTH=800; // set width

int number=0;

int num[] = new int[3];

int points[]= new int[WIDTH]; // points to be drawn from incoming data

char beat=' ';

int beats=0;

int dropNum[] = new int[4]; // array used to compare data not needed


void setup() {

println(Serial.list());

size(WIDTH, 700);

frameRate(30);

port = new Serial(this,"COM4", 9600); // local USB- port

}


void draw() {

background(0);// to erase

port.write('a');

if (2 < port.available()) { // wait for three bytes

for (int i=0;i<3;i++){

num[i] = port.read(); // read them into an array

}

//println( num[0]);

//println( num[1]);

number = (num[0] << 8)+num[1]; // num range add two incoming bytes together after shifting

beat = (char) num[2]; // look to see if there is a 'b' to signal a beat

println(beats);

}

stroke(0,255,100);

if (beat == 'b'){// sent from arduino

beats++;

}

// draw heart beat data

strokeWeight(1);

points[(WIDTH/2)] = number; // strat drawing half way accross screen give current reading to array

//goes through all points and draws a line between consecutive ones

for (int i=1 ;i< points.length-1; i++){

points[i]= points[i+1];

line(i,height-points[i-1]-40,i,height-points[i]-40);

}

}