Arduino Uno as keyboard I am trying to make Arduino Uno to act as a keyboard. I have successfully flashed the USB-HID firmware in it using this link also and programmed it like this.

uint8_t buf[8] = {
 0
};

int inpin1 = 7; 
int inpin2 = 8;
int val1 = 0;
int val2 = 0;

void setup() {
  Serial.begin(9600);
  delay(200);
  pinMode(inpin1, INPUT);
  pinMode(inpin2, INPUT);
}

void loop() {
  val1 = digitalRead(inpin1);
  if(val1 != HIGH) {
   buf[2] = 80; // Left Arrow
   Serial.write(buf, 8);
   releaseKey();
  }
  val2 = digitalRead(inpin2);
  if(val2 != HIGH) {
    buf[2] = 79; // Right Arrow
    Serial.write(buf, 8);
    releaseKey();
  }
}

void releaseKey() {
  buf[0] = 0;
  buf[2] = 0;
  Serial.write(buf, 8);
}


The above code works fine but the problem is that when I tried to play a game, which uses right arrow and left arrow, and to control a car I was using the push button, which I connected to Arduino as left and right arrow keys. But suppose I want to turn a car. I have to press the key and then release the key to move it a very little to the right or left. So, if I want to turn the car either left or right, I have to press and release so many times that it becomes impossible to play the game. Do you anyone know how to resolve this problem?
You should just not call the releaseKey function, until the button is released.

int oldVal1 = 0;
int oldVal2 = 0;

void loop() 
{
    val1 = digitalRead(inpin1);
    if( val1!=oldVal1 )
    {
        oldVal1 = val1;
        if(val1 != HIGH)
        {
            buf[2] = 80; // Left Arrow
            Serial.write(buf, 8);
        }
        else
        {
            releaseKey();
        }
    }

    val2 = digitalRead(inpin2);
    if( val2!=oldVal2 )
    {
        oldVal2 = val2;
        if(val2 != HIGH)
        {
            buf[2] = 79; // Right Arrow
            Serial.write(buf, 8);
        } 
        else 
        {
            releaseKey();
        }
    }

}