int paddleY;
int paddleSpeedY;

void setup(){
  paddleY = 100;
  paddleSpeedY = 0;
}

void draw(){
  fill(255,0,0); //Makes the paddle RED, yo ucan make it any colour 
  rect(50, paddleY, 20, 100); //I didn't do a paddleX, just to keep this example simpler

  paddleY = paddleY + paddleSpeedY;
}


void keyPressed(){ //Happens when a key is pressed
  if(key == 'w'){ //UP
    paddleSpeedY = -2;
  }else if(key == 's'){ //DOWN
    paddleSpeedY = 2;
  }
}

void keyReleased(){ //Happens when a key is released.  This setup assumes we only use 1 key at a time
 paddleSpeedY = 0;
}