141
edits
IFD:PhysicalComp2011/Julia Putscher/Codes for Arduino and Processing (view source)
Revision as of 12:28, 6 April 2012
, 6 April 2012→Heartrate Sensor - Simple Circuit
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import processing.serial.*; | import processing.serial.*; | ||
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String buff = ""; | String buff = ""; | ||
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} | } | ||
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==Heartrate Sensor - Circuit With Amplifier== | |||
===Arduino=== | |||
define mask 255 // kill top bits | |||
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int potPin = 0; // select the input pin for the pot | |||
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int ledPin = 13; // select the pin for the LED | |||
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int val = 16706; // variable to store the value coming from the sensor | |||
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int val2 =0; | |||
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int a =0; | |||
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int b =0; | |||
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int beats[]= {0,0,0,0,0};// to track last five reads for a pattern | |||
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boolean beated = false; | |||
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//function dec | |||
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boolean getBioData(); | |||
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void setup() { | |||
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pinMode(ledPin, OUTPUT); // declare the ledPin as an OUTPUT | |||
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Serial.begin(9600); | |||
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} | |||
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void loop() { | |||
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char check=' '; | |||
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val = analogRead(potPin); // read the value from the sensor | |||
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if (Serial.read() =='a'){ // check buffer for an 'a' | |||
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val2 = val; | |||
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b= val & mask; | |||
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a =((val2>>8) & mask); //just in case mask | |||
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delay(20); | |||
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// Serial.print("b"); // debug | |||
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// Serial.print(b); | |||
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Serial.print(a,BYTE); | |||
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Serial.print(b,BYTE); | |||
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if (getBioData()){ // call bio function | |||
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Serial.print('b',BYTE); | |||
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} | |||
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else Serial.print('n',BYTE); | |||
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} | |||
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} | |||
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boolean getBioData(){ | |||
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int beatVal = analogRead(potPin); // read the value from the sensor | |||
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beats[4] = beatVal; // put in back of array | |||
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int beatDif = beats[5 - 1] - beats[0]; | |||
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for (int i = 0; i < 5;i++){ | |||
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beats[i] = beats[i+1]; // push zero out front | |||
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} | |||
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// check for beat | |||
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if ( beatDif > 10 && (beated != true)){ | |||
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beated = true; | |||
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return true; | |||
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} | |||
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else if( beatDif < 2 ){ | |||
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beated = false; | |||
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return false; | |||
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} | |||
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else return false; | |||
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} | |||
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===Processing=== | |||
import processing.serial.*; | |||
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Serial port; // Create object from Serial class | |||
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int val; // Data received from the serial port | |||
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int WIDTH=800; // set width | |||
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int number=0; | |||
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int num[] = new int[3]; | |||
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int points[]= new int[WIDTH]; // points to be drawn from incoming data | |||
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char beat=' '; | |||
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int beats=0; | |||
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int dropNum[] = new int[4]; // array used to compare data not needed | |||
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void setup() { | |||
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println(Serial.list()); | |||
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size(WIDTH, 700); | |||
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frameRate(30); | |||
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port = new Serial(this,"COM4", 9600); // local USB- port | |||
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} | |||
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void draw() { | |||
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background(0);// to erase | |||
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port.write('a'); | |||
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if (2 < port.available()) { // wait for three bytes | |||
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for (int i=0;i<3;i++){ | |||
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num[i] = port.read(); // read them into an array | |||
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} | |||
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//println( num[0]); | |||
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//println( num[1]); | |||
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number = (num[0] << 8)+num[1]; // num range add two incoming bytes together after shifting | |||
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beat = (char) num[2]; // look to see if there is a 'b' to signal a beat | |||
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println(beats); | |||
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} | |||
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stroke(0,255,100); | |||
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if (beat == 'b'){// sent from arduino | |||
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beats++; | |||
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} | |||
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// draw heart beat data | |||
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strokeWeight(1); | |||
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points[(WIDTH/2)] = number; // strat drawing half way accross screen give current reading to array | |||
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//goes through all points and draws a line between consecutive ones | |||
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for (int i=1 ;i< points.length-1; i++){ | |||
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points[i]= points[i+1]; | |||
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line(i,height-points[i-1]-40,i,height-points[i]-40); | |||
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} | |||
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} | |||
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