microcontroller to use for usb keyboard interface

#include <IRremote.h>

int RECV_PIN = 11;
IRrecv irrecv(RECV_PIN);
decode_results results;

double previous = 0;
double end_one = 4146893829;
//double end_two = NEED_OUTPUT_VALUE;
double output = 0;

void setup()
{
  Serial.begin(9600);
  irrecv.enableIRIn(); // Start the receiver
}

void loop() {
  if (irrecv.decode(&results)) {
    if (results.value == end_one) {
      Serial.println("end_all");
    }else if(results.value != previous){  //if it is a useful value
      Serial.println(results.value);
      //output = findChar(results.value);
      previous = results.value;
    }
    irrecv.resume(); // Receive the next value
  }
}

double findChar() {
  double code = results.value;
  
  //NEED CODE TO FIND CHARACTER/COMMAND DATA FROM VALUE
  //POSSIBLY MAKE AN ARRAY OF CODES, WITH THE ELEMENT CORRESPONDING TO THE ASCII VALUE
  if(results.value /*within bounds of ascii characters*/) {
    //return value of ascii character
    //or code for keyboard command
    //or execute keyboard command from here
  }else if(results.value /*volume or other such command key*/) {
    //return command information, or do command, or something
  }else if(results.value /*shift key or function key or other such key, need to look at keyboard protocol for a standard usb keyboard*/) {
    //need to look at keyboard protocol
  }
  return(0/*WHATERVERINEEDTORETURN*/);  //!!!!!!!!!!!! 
}