Introduction

In this article, I will explain the working of a sound sensor with Arduino Mega 2560. When the sound is detected the LED is automatically ON, and then we can easily detect the sound.
Parts:
  • Arduino Mega 2560
  • Sound Sensor
  • BreadBoard
  • HookUp Wires
  • LED-3.
SoundSensor:
Figure 1: Sound Sensor
  • The sound sensor can easily find the sound.
  • It can detect the sound of the environment.
  • They can have the standard of three pins in the sensor.
Connection:
Step 1: Connection from the Sound Sensor to the Arduino Mega 2560,
  • The Gnd pin can be connected to the Gnd of the Arduino Mega 2560.
  • The Vcc pin can be connected to the Vcc of the Arduino Mega 2560.
  • The Vin pin can be connected to the Analog pin of A1 to the Arduin oMega 2560.
Connection from the LED to the ArduinoMega2560:
First LED connection:
  • Positive pin = 13
  • Negative Pin = Gnd.
Second LED connection:
  • Positive pin = 12
  • Negative Pin = Gnd.
Third LED connection:
  • Postive pin = 11
  • Negative Pin = Gnd
Explanation:
  • The sound is produced and then automatically the LED is ON.
  • It can have the level of noise at places.
Uses:
  • Home
  • School/colleges
  • Forest.....etc
Programming:
  1. int soundSensorPin = A1;
  2. int soundReading = 0;
  3. int soundThreshold = 500;
  4. int intensity[3] =
  5. {
  6. 0,
  7. 0,
  8. 0
  9. };
  10. int LEDPins[3] =
  11. {
  12. 13,
  13. 12,
  14. 11
  15. };
  16. int numberOfPins = 3;
  17. int currentPin = 0;
  18. int fadeCounter = 0;
  19. int fadeDelay = 50;
  20. boolean switcher = true;
  22. void setup()
  23. {
  24. pinMode(soundSensorPin, INPUT);
  25. for (int i = 0; i < numberOfPins; i++)
  26. {
  27. pinMode(LEDPins[i], OUTPUT);
  28. }
  29. }
  31. void loop()
  32. {
  33. soundReading = analogRead(soundSensorPin);
  34. if (soundReading > soundThreshold)
  35. {
  36. if (switcher)
  37. {
  38. aboveThreshold(currentPin);
  39. switcher = true;
  40. }
  41. } else
  42. {
  43. if (switcher)
  44. {
  45. belowThreshold();
  46. switcher = true;
  47. }
  48. }
  49. }
  51. void aboveThreshold(int cPin)
  52. {
  53. switcher = false;
  54. if (intensity[cPin] < 10)
  55. {
  56. intensity[cPin] = 255;
  57. delay(50);
  58. currentPin = currentPin + 1;
  59. }
  61. if (currentPin == numberOfPins)
  62. {
  63. currentPin = 0;
  64. }
  65. }
  67. void belowThreshold()
  68. {
  69. switcher = false;
  70. fadeCounter++;
  71. if (fadeCounter == fadeDelay)
  72. {
  73. fadeCounter = 0;
  74. for (int i = 0; i < numberOfPins; i++)
  75. {
  76. analogWrite(LEDPins[i], intensity[i]);
  77. }
  78. for (int i = 0; i < numberOfPins; i++)
  79. {
  80. intensity[i]--;
  81. if (intensity[i] < 0)
  82. {
  83. intensity[i] = 0;
  84. }
  85. }
  86. }
  87. }
Output:
Figure 2: Output
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