These robots are easy enough to understand and build that kids can get started quickly, but they also offer great depth through Mr-potato-head-style mechanical customization and Arduino programming.
I've searched extensively for a way that I could plot my Arduino sensor reading in real time. Not only plot, but also display and store the data for further experimentation and corrections.The simplest solution I’ve found was to use excel, but with a twist.Also if you find this instructable interesting, perhaps you'll like another one I've made (about displaying live Arduino sensor readings on a Nokia 5110 LCD):http://www.instructables.com/id/Arduinonokia-lcd-...
Track Your Route! (using Arduino, MicroSD Card Shield, and GPS): 4 Steps
This robot was mainly built for understanding artificial intelligence with Arduino. It is capable of, obstacle avoidance, voice control, chatting with humans, Bluetooth control as well as gesture control.