Extension Activities using LEDs
From ROBOTC API Guide
Arduino → Arduino Tutorials and Guided Projects → Parallax BoeBot + Arduino Shield, Mobile Robotics Platform → Extension Activities using LEDs
Flash Morse CodeOne possible task you can try on your own is to make the Arduino flash a message using Morse Code. You could have the robot flash something like "Hello World!" or “Danger, Will Robinson!”
To help get you started, here are some links explaining how Morse Code Works.
Make a program to decode a Morse code signal.
Binary ClockYou can use LEDs to display the time using binary.