Since R2D2 from StarWars is very popular with my kids these days, I started working on a tin can robot which looks something like R2D2 and is remote controllable through a Android device (cell phone, tablet, ..).
The body is made from a can which originally was for coffee. As you can see in the pictures below, I sanded the whole can, since I plan to re-paint it later on. For the legs I used some u-shaped pieces of aluminium I found in my shop. To each leg I added a gear motor with a small wheel. The wheels fit perfectly inside the u-shaped aluminium legs. Beside the to motored legs, which I mounted to the left and right of the can, I used a small roll which I attached on the bottom of the can.
To drive the motors, I use a TB6612FNG motor controller which is operated through a Parallax Propeller Quickstart board. The commands to operate the motors are received through a BTBee. On the Propeller I use my PROPSHELL code to parse what was received from the BTBee. To send commands, I currently use my cell phone with Bluethooth SPP app. With this setup, I am currently able to remotely drive the robots motors. Next step will be to put all the stuff into the can, adding batteries, and see how the thing behaves while driving.