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RuiViana

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May 13th, 2015
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  1.  
  2. /*
  3. >> Pulse Sensor Amped 1.1 <<
  4. This code is for Pulse Sensor Amped by Joel Murphy and Yury Gitman
  5. www.pulsesensor.com
  6. >>> Pulse Sensor purple wire goes to Analog Pin 0 <<<
  7. Pulse Sensor sample aquisition and processing happens in the background via Timer 2 interrupt. 2mS sample rate.
  8. PWM on pins 3 and 11 will not work when using this code, because we are using Timer 2!
  9. The following variables are automatically updated:
  10. Signal : int that holds the analog signal data straight from the sensor. updated every 2mS.
  11. IBI : int that holds the time interval between beats. 2mS resolution.
  12. BPM : int that holds the heart rate value, derived every beat, from averaging previous 10 IBI values.
  13. QS : boolean that is made true whenever Pulse is found and BPM is updated. User must reset.
  14. Pulse : boolean that is true when a heartbeat is sensed then false in time with pin13 LED going out.
  15.  
  16. This code is designed with output serial data to Processing sketch "PulseSensorAmped_Processing-xx"
  17. The Processing sketch is a simple data visualizer.
  18. All the work to find the heartbeat and determine the heartrate happens in the code below.
  19. Pin 13 LED will blink with heartbeat.
  20. If you want to use pin 13 for something else, adjust the interrupt handler
  21. It will also fade an LED on pin fadePin with every beat. Put an LED and series resistor from fadePin to GND.
  22. Check here for detailed code walkthrough:
  23. http://pulsesensor.myshopify.com/pages/pulse-sensor-amped-arduino-v1dot1
  24.  
  25. Code Version 02 by Joel Murphy & Yury Gitman Fall 2012
  26. This update changes the HRV variable name to IBI, which stands for Inter-Beat Interval, for clarity.
  27. Switched the interrupt to Timer2. 500Hz sample rate, 2mS resolution IBI value.
  28. Fade LED pin moved to pin 5 (use of Timer2 disables PWM on pins 3 & 11).
  29. Tidied up inefficiencies since the last version.
  30. */
  31.  
  32.  
  33. // VARIABLES
  34. int pulsePin = 0; // Pulse Sensor purple wire connected to analog pin 0
  35. int blinkPin = 13; // pin to blink led at each beat
  36. int fadePin = 5; // pin to do fancy classy fading blink at each beat
  37. int fadeRate = 0; // used to fade LED on with PWM on fadePin
  38.  
  39.  
  40. // these variables are volatile because they are used during the interrupt service routine!
  41. volatile int BPM; // used to hold the pulse rate
  42. volatile int Signal; // holds the incoming raw data
  43. volatile int IBI = 600; // holds the time between beats, the Inter-Beat Interval
  44. volatile boolean Pulse = false; // true when pulse wave is high, false when it's low
  45. volatile boolean QS = false; // becomes true when Arduoino finds a beat.
  46.  
  47.  
  48. void setup(){
  49. pinMode(blinkPin,OUTPUT); // pin that will blink to your heartbeat!
  50. pinMode(fadePin,OUTPUT); // pin that will fade to your heartbeat!
  51. Serial.begin(115200); // we agree to talk fast!
  52. interruptSetup(); // sets up to read Pulse Sensor signal every 2mS
  53. // UN-COMMENT THE NEXT LINE IF YOU ARE POWERING The Pulse Sensor AT LOW VOLTAGE,
  54. // AND APPLY THAT VOLTAGE TO THE A-REF PIN
  55. //analogReference(EXTERNAL);
  56. }
  57.  
  58.  
  59.  
  60. void loop(){
  61. sendDataToProcessing('S', Signal); // send Processing the raw Pulse Sensor data
  62. if (QS == true){ // Quantified Self flag is true when arduino finds a heartbeat
  63. fadeRate = 255; // Set 'fadeRate' Variable to 255 to fade LED with pulse
  64. sendDataToProcessing('B',BPM); // send heart rate with a 'B' prefix
  65.  
  66. if (BPM > 90) // ----------------- sms
  67. { // ----------------- sms
  68. // coloque aqui o sodigo do sms // ----------------- sms
  69. } // ----------------- sms
  70.  
  71. sendDataToProcessing('Q',IBI); // send time between beats with a 'Q' prefix
  72. QS = false; // reset the Quantified Self flag for next time
  73. }
  74.  
  75. ledFadeToBeat();
  76.  
  77. delay(20); // take a break
  78. }
  79.  
  80.  
  81. void ledFadeToBeat(){
  82. fadeRate -= 15; // set LED fade value
  83. fadeRate = constrain(fadeRate,0,255); // keep LED fade value from going into negative numbers!
  84. analogWrite(fadePin,fadeRate); // fade LED
  85. }
  86.  
  87.  
  88. void sendDataToProcessing(char symbol, int data ){
  89. Serial.print(symbol); // symbol prefix tells Processing what type of data is coming
  90. Serial.println(data); // the data to send culminating in a carriage return
  91. }
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