the raspberry pi will be used as the on the arm computer along with the tft lcd. It will communicate with the arduino pro mini on the robot to give it instructions for manual control when needed. The pro mini will send information to the rasp pi to display on the Tft screen. I will not be buying anything for this project, I will just be using what I have around. If I had a budget I would do things a little differently. I will be 3d printing parts as needed as well.