arduino-led-party.ino

arduino-led-party.ino

/**
 * This sketch will let three LED strips blink based on the intensity of sound input. My example
 * used 12V LED strips which required an external power source and some transistors to hook up
 * if you have something to hook up to the Arduino directly then you can use that instead of 
 * course and omit/change the transistors/resistors.
 *
 * Requirements:
 * - Arduino Nano/Uno (or equivalent)
 * - Power source for the Arduino (i.e. 9V battery or USB)
 * - Digital microphone module (i.e. LM393)
 * - Power source for the LEDs (i.e. 12V battery)
 * - 3x 12V LED strip
 * - 3x TIP120 transistor
 * - 3x 2k Ohm resistor
 * - Slide switch (to control sensitivity)
 *
 * Sorry, I don't have a schematic for this setup anymore :)
 */

int firstLed = 10;
int secondLed = 11;
int thirdLed = 12;

int microphone = 9;
int input = LOW;
int inputs[10] = {0, 0, 0, 0, 00};
int inputIndex = 0;
int inputSize = 5;
int brightness;

void setup() {
  pinMode(microphone, INPUT);
  pinMode(firstLed, OUTPUT);
  pinMode(secondLed, OUTPUT);
  pinMode(thirdLed, OUTPUT);
}

void loop() {
  input = digitalRead(microphone);
  inputs[inputIndex] = input;

  inputIndex++;
  if (inputIndex == inputSize) {
    inputIndex = 0;
  }

  int inputSum = sum();
  brightness = inputSum > 0 ? round(inputSum * (255 / inputSize)) : 0;
  analogWrite(firstLed, brightness);
  analogWrite(secondLed, brightness);
  analogWrite(thirdLed, brightness);
}

int sum() {
  int sum = 0;
  for (int index = 0; index < inputSize; index++) {
    sum += inputs[index];
  }
  return sum < 0 ? 0 : sum;
}