int IRledPin =  3;
void setup()
{
  pinMode(IRledPin, OUTPUT);
  Serial.begin(9600);
}
void loop()
{
int  a;
  if(Serial.available()>0)
  {
    a=Serial.read();
  switch(a)
  {
    case 1: power();    //if it receives the number "1" from the app then the case one will be executed
             
            break;
    case 2:tvpower();
             
            break;
    case 3:chplus();
            
           break;
    case 4:chminus();
           break;
    case 5:volplus();
           break;
    case 6:volminus();
           break;
                             //all the data provided corresponds to my tv remote thus you have to modify to your needs
    case 10:  zero();        //if it receives the number "10" from the app then the case 10 will be executed thus the respective channel is switched
              delay(700);
              nine();
              delay(700);
              one();
              delay(700);
              zero();
              delay(700);
              break;          //channel number 910 will be switched
     
  }  
}
void pulseIR(long microsecs)
{
  cli();
  while (microsecs > 0)
  {
    digitalWrite(IRledPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(IRledPin, LOW);
    delayMicroseconds(10);
    microsecs -= 26;
  }
  sei();
}

void power()   /*the function stores the data for the power button taken from the step-1*/
{
  //the data is for my remote so update the data with yours
  delayMicroseconds(57608 );
  pulseIR( 2680 );
  delayMicroseconds(980 );
  pulseIR( 400 );
  delayMicroseconds(520 );
  pulseIR( 400 );
  delayMicroseconds(500 );
  pulseIR( 420 );
  delayMicroseconds(960 );
  pulseIR( 400 );
  delayMicroseconds(980 );
  pulseIR( 860 );
  delayMicroseconds(520 );
  pulseIR( 400 );
  delayMicroseconds(500 );
  pulseIR( 400 );
  delayMicroseconds(520 );
  pulseIR( 400 );
  delayMicroseconds(500 );
  pulseIR( 420 );
  delayMicroseconds(500 );
  pulseIR( 400 );
  delayMicroseconds(500 );
  pulseIR( 420 );
  delayMicroseconds(500 );
  pulseIR( 400 );
  delayMicroseconds(520 );
  pulseIR( 400 );
  delayMicroseconds(500 );
  pulseIR( 420 );
  delayMicroseconds(500 );
  pulseIR( 400 );
  delayMicroseconds(520 );
  pulseIR( 400 );
  delayMicroseconds(500 );
  pulseIR( 420 );
  delayMicroseconds(500 );
  pulseIR( 400 );
  delayMicroseconds(500 );
  pulseIR( 420 );
  delayMicroseconds(500 );
  pulseIR( 400 );
  delayMicroseconds(520 );
  pulseIR( 860 );
  delayMicroseconds(500 );
  pulseIR( 400 );
  delayMicroseconds(960 );
  pulseIR( 420 );
  delayMicroseconds(500 );
  pulseIR( 400 );
  delayMicroseconds(61644 );
  pulseIR( 2700 );
  delayMicroseconds(980 );
  pulseIR( 400 );
  delayMicroseconds(500 );
  pulseIR( 420 );
  delayMicroseconds(500 );
  pulseIR( 400 );
  delayMicroseconds(980 );
  pulseIR( 400 );
  delayMicroseconds(960 );
  pulseIR( 880 );
  delayMicroseconds(500 );
  pulseIR( 420 );
  delayMicroseconds(500 );
  pulseIR( 400 );
  delayMicroseconds(500 );
  pulseIR( 420 );
  delayMicroseconds(500 );
  pulseIR( 400 );
  delayMicroseconds(520 );
  pulseIR( 400 );
  delayMicroseconds(500 );
  pulseIR( 400 );
  delayMicroseconds(520 );
  pulseIR( 400 );
  delayMicroseconds(500 );
  pulseIR( 420 );
  delayMicroseconds(500 );
  pulseIR( 400 );
  delayMicroseconds(520 );
  pulseIR( 400 );
  delayMicroseconds(500 );
  pulseIR( 420 );
  delayMicroseconds(480 );
  pulseIR( 420 );
  delayMicroseconds(520 );
  pulseIR( 400 );
  delayMicroseconds(500 );
  pulseIR( 400 );
  delayMicroseconds(520 );
  pulseIR( 400 );
  delayMicroseconds(500 );
  pulseIR( 860 );
  delayMicroseconds(520 );
  pulseIR( 400 );
  delayMicroseconds(960 );
  pulseIR( 420 );
  delayMicroseconds(500 );
  pulseIR( 400 );



}
void chplus()
{
//put the data of your channel plus button in this section
}

void ch minus()
{

}
void one()
{
  
}
void two()
{
  
}
void three()
{
}
//add for all the 10 numbers.

//similarly you can add any no of functions for each buttons