Description

Two pots control three LEDs. LEDs blink in a syncopated rhythm, and the
pots control brightness and rhythm speed. One drawback is that pot
input only takes affect after the beat has completed.

Components Used

• LEDs
• Potentiometers
• Resistors

Arduino Code

/*

  LightBeat

  Two pots control three LEDs.  LEDs blink in a syncopated rhythm, and the 

  pots control brightness and rhythm speed.  One drawback is that pot

  input only takes affect after the beat has completed.

  By Ken-ichi Ueda

*/

int pinR = 9;

int pinG = 10;

int pinB = 11;

int pins[] = {pinR, pinG, pinB};

int potA = 0;

int potB = 1;

int valA = 0; // brightness

int valB = 0; // rhythm speed

int i = 0; // loop counter

int minWait = 100;

int maxWait = 1000;

int fadeT = 5;

//int actPinIndex = 0; // active pin in the rhythm

int actPin = pinR;

int const meter = 9;

float rhythm[9] = {1,    1,    2,    1.5,  0.5,  0.5,  1,    0.25, 0.25};

int sequence[9] = {pinR, pinR, pinB, pinR, pinR, pinB, pinR, pinG, pinG};

int DEBUG = 1;

void setup() {

  pinMode(pinR, OUTPUT);

  pinMode(pinG, OUTPUT);

  pinMode(pinB, OUTPUT);

  Serial.begin(9600);

}

void loop() {

  valA = analogRead(potA) / 4;

  valB = (int) (((float) analogRead(potB) / 1024.0) * (maxWait - minWait)) + minWait;

  for(i=0; i < meter; i++) {

    actPin = sequence[i];

    if (DEBUG) { 

      Serial.print("Setting pin ");

      Serial.print(actPin);

      Serial.print(" to ");

      Serial.println(valA);

    }

    analogWrite(actPin, valA);

    if (DEBUG) { 

      Serial.print("Waiting ");

      Serial.print(valB);

      Serial.println(" ms");

    }

    delay(valB * rhythm[i]);

    analogWrite(actPin, 0);

    delay(valB * rhythm[i] / 2);

  }

}

Picture