Telegraphs were once the fastest way to send messages over a distance. While they’re long since obsolete, DIYprojects decided to build a modern take on the paper strip telegraph, using an Arduino Mini, a motor, wood, and a pen to write down text messages. Build guide here.
Learn to build your own walking robot with the SunFounder Nano DIY 4-DOF Robot Kit. It uses a ultrasonic sensor to avoid obstacles, and programming is easy with the companion visual programming toolkit. You can get this fun kit for 16% off the MSRP in The Awesomer Shop.