We have coded an RC car to autonomously follow a track and stop at a "stop sign".
This car follows a path on the ground, stops at a stop sign, and a stoplight due to the magic of vision processing on a BeagleBone Black!
Designing a car to stay within lane and react to stop signs and lights
We teach a car to stay in it's lane and stop on a dime
A robot which measures the user's body temperature, decides 'happy' or 'sad', and draws either a smiley or frowny face.
Build a car hacking spy device to remotely read and send CAN commands and track GPS location. All based on open source software/hardware.
The control of a robot may be painful as you have to develop specific clients for each mobile device. I propose a Web based control