Add brains to the car by mounting the Arduino and breadboard on top of the acrylic chassis. Eight layers of mounting tape between the acrylic and board will bring the USB port above the wheel level. The Arduino microcontroller cannot handle anymore that 40 mA of electric current. The motor uses 100 to 200 mA of current, and will burn out the microcontroller if one tries to run the motor from one of the Arduino pins. A motor shield has to be used between the Arduino and motors, and this can handle up to 600 mA of current.