When the player collides with the cookie the ball / item that the player is using to collect things vibrates .

I am using the Adafruit_DRV2605.h library.

#include <Adafruit_DRV2605.h>

#include <Wire.h>
#include "Adafruit_DRV2605.h"

Adafruit_DRV2605 drv;

and adding this part to the Arduino Script to be called with Ping(4);

see more technical details here:

Mixed Reality Game in physical space / Final project breakdown (introduction )