Control LED's with a remote control, you can see the full project at my website www.randomnerdtutorials.com

Control LED's with a remote control

/*
 * IRremote Library - Copyright 2009 Ken Shirriff
 * created by Rui Santos, http://randomnerdtutorials.wordpress.com
 * Control LED's with a remote control
 * 2013
 */

#include <IRremote.h>

int IR_Recv = 3;   //IR Receiver Pin 3
int g_ledPin = 5;  //green LED pin 5
int y_ledPin = 6;  //yellow LED pin 6
int r_ledPin = 9;  //red LED pin 9
int b_ledPin = 10; //blue LED pin 10
int ledPins[] = {5, 6, 9, 10};  //array with all the LED's pins
int ledStates[] ={0, 0, 0, 0};  //this means the LED's states at first is 0 = LOW
int i=0;  //LED index for the arrays

IRrecv irrecv(IR_Recv);
decode_results results;

//variables to make the LED blink when selected
int ledState = LOW;             // ledState to turn the LED on or off
long previousMillis = 0;        // stores last time LED was updated
long interval = 1000;           // interval at which to blink (milliseconds)

void setup(){
  Serial.begin(9600);  //starts serial communication
  irrecv.enableIRIn(); // Starts the receiver
  pinMode(g_ledPin, OUTPUT);      // sets the digital pin as output
  pinMode(y_ledPin, OUTPUT);      // sets the digital pin as output
  pinMode(r_ledPin, OUTPUT);      // sets the digital pin as output
  pinMode(b_ledPin, OUTPUT);      // sets the digital pin as output
}

void loop(){
  //decodes the infrared input
  if (irrecv.decode(&results)){
    long int decCode = results.value;
    Serial.println(decCode);
   //switch case to use the selected remote control button
   switch (results.value){
      case 57936: //when you press the Forward button
       //this if/else statement makes sure that LED is ON or OFF before move to the next LED
       if(ledStates[i]==0)
          digitalWrite(ledPins[i], LOW);
       else
          digitalWrite(ledPins[i], HIGH);
       Serial.println("Next LED");
       //makes sure that when we reach the last LED it goes to the first LED again
       if(i>=3)
          i=-1;  
       i+=1;              
       break;
        
      case 57928: //when you press the Reverse button
        //this if/else statement makes sure that LED is ON or OFF before move to the previous LED
        if(ledStates[i]==0)
          digitalWrite(ledPins[i], LOW);
        else
          digitalWrite(ledPins[i], HIGH);
        Serial.println("Previous LED");
        //makes sure that when we reach the first LED it goes to the last LED
        if(i<=0)
          i=4;
        i-=1;
        break;
        
      case 57932: //when you press the Mute button
        if(ledStates[i]==0){ //if the LED is off, It will turn on
          Serial.println("Turns ON the LED Selected");
          digitalWrite(ledPins[i], HIGH);  //sets the LED on
          ledStates[i]=1;                  //updates the LED state
        }
        else{
          Serial.println("Turns OFF the LED Selected"); //else: the LED is on, It will turn off
          digitalWrite(ledPins[i], LOW);   //sets the LED off
          ledStates[i]=0;                  //updates the LED state
        }        
        break;  
        
      case 57920: //when you press the Power button
        Serial.println("Turns OFF all the LED's"); 
        digitalWrite(g_ledPin, LOW);   // sets the green LED off
        ledStates[0] =0;               // updates the LED state
        digitalWrite(y_ledPin, LOW);   // sets the yellow LED off
        ledStates[1] =0;               // updates the LED state
        digitalWrite(r_ledPin, LOW);   // sets the red LED off
        ledStates[2] =0;               // updates the LED state
        digitalWrite(b_ledPin, LOW);   // sets the blue LED off
        ledStates[3] =0;               // updates the LED state
        break;  
        
      default: 
        Serial.println("Waiting");
    }
    irrecv.resume(); // Receives the next value from the button you press
  }
  //this if statment makes the LED blink if it's selected and off
  if(ledStates[i]==0){
    unsigned long currentMillis = millis();
    if(currentMillis - previousMillis > interval) {
      // save the last time you blinked the LED 
      previousMillis = currentMillis;   
      // if the LED is off turn it on and vice-versa:
      if (ledState == LOW)
        ledState = HIGH;
      else
        ledState = LOW;
      // set the LED with the ledState of the variable:
      digitalWrite(ledPins[i], ledState);
    }
  }
}