Let's first see what we need for this project.

The base of this project is of course the robot itself. For this project, we used a DFRobot miniQ two-wheeled robot chassis. It comes with a round robot chassis, two DC motors, two wheels, and some screws and bolts so that you can mount multiple Arduino boards on it. You can basically use any equivalent robot chassis that has two wheels coupled with DC motors and on which you can mount Arduino-compatible boards.

To control the robot, we are actually going to use three different Arduino boards. The "brain" of the robot will be a simple Arduino Uno board. On top of that, we will use a DFRobot motor shield to control the two DC motors of the robot. And on top of these two boards, we will put a prototyping shield so that we can connect different modules to the robot.

To control the robot remotely, we will again use BLE. To give BLE connectivity to the robot, we used an Adafruit nRF8001 breakout board.

To give the robot...