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Aug 27th, 2015
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  1. /* Sensor test sketch
  2. for more information see http://www.ladyada.net/make/logshield/lighttemp.html
  3. */
  4.  
  5. #define aref_voltage 3.3 // we tie 3.3V to ARef and measure it with a multimeter!
  6.  
  7.  
  8.  
  9.  
  10. //TMP36 Pin Variables
  11. int tempPin = A0; //the analog pin the TMP36's Vout (sense) pin is connected to
  12. //the resolution is 10 mV / degree centigrade with a
  13. //500 mV offset to allow for negative temperatures
  14. unsigned long tempReading; // the analog reading from the sensor
  15.  
  16. bool flag = 0; // For telling if we were on or off before
  17.  
  18. void setup(void) {
  19. // We'll send debugging information via the Serial monitor
  20. Serial.begin(115200);
  21. pinMode(2, OUTPUT);
  22.  
  23. // If you want to set the aref to something other than 5v
  24. analogReference(EXTERNAL);
  25. }
  26.  
  27.  
  28. void loop(void) {
  29. tempReading = 0;
  30.  
  31. for(int i = 0; i < 1000; i++){
  32. tempReading += analogRead(tempPin);
  33. }
  34.  
  35. tempReading /= 1000; // Average a few reads.
  36.  
  37. // converting that reading to voltage, which is based off the reference voltage
  38. float voltage = tempReading * aref_voltage;
  39. voltage /= 1024.0;
  40.  
  41. // now print out the temperature
  42. float temperatureC = (voltage - 0.5) * 100 ; //converting from 10 mv per degree wit 500 mV offset
  43. //to degrees ((volatge - 500mV) times 100)
  44. // now convert to Fahrenheight
  45. float temperatureF = (temperatureC * 9.0 / 5.0) + 32.0;
  46. Serial.println(temperatureF);
  47.  
  48. if (temperatureF > 95) {
  49. digitalWrite(2, HIGH);
  50. if (flag == 0){
  51. flag = 1;
  52. Serial.println("fan_turned_on");
  53. }
  54. } else if (temperatureF < 90) {
  55. digitalWrite(2, LOW);
  56. if (flag == 1){
  57. flag = 0;
  58. Serial.println("fan_turned_off");
  59. }
  60. }
  61.  
  62. delay(5000);
  63. }
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