'Keyboard' not found when trying to use Keyboard.write from the <Keyboard> library

Question

I am trying to get a response from the arduino when I press a key, but when I try to upload the code it says that it could not find 'Keyboard' with 'Keyboard.write'. Here is my code. Ignore the bits with servo stuff, that is for the project later on. I am using the arduino mega 2560.

  #include <Servo.h>
  #include <Keyboard.h>

Servo myservo;  
Servo myservo2;

int pos = 0;    
int pos2 = 0;
String comdata = "";
int lastLength = 0;

void setup() {
myservo.attach(12); 
myservo2.attach(11);
Serial.begin(9600);
pinMode(2, INPUT_PULLUP);
Keyboard.begin();
}

void loop() {
if (Serial.available() > 0) {
 // read incoming serial data:
 char inChar = Serial.read();
 Keyboard.write(inChar + 1);
}

}

Answer 1

The Mega2560 can't be a keyboard. It lacks the required hardware.

Instead you need to use one of the pure USB boards, like the Leonardo.

Answer 2

To use USB communication (such as mouse or keyboard) you must have a arduino that uses an ATMEGA32U4. These are so far, the only boards that can work as a USB device.