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The state of the art today employs a computer to randomly generate practice text. [M0TGN] wanted a device to generate practice code, so he built it around an Arduino.

Scientists from York University in Toronto are using alcohol as a method for sending text messages. How, exactly? By converting sprays of isopropyl alcohol into binary code, using off-the-shelf ...

Although Arduino's programming language is based on C++, you won't be able to use all of its commands. But, you can still use objects in Arduino's IDE, which are a fundamental aspect of C++.

All you need is an Arduino, a motion sensor, a few wires and headers, and the code provided at the site below. Hit the link to see step-by-step instructions on how to put it together.

Arduino is trademarked—even though it's open hardware, makers of new products should "explicitly say that you're not connected to Arduino and your product is a derivative," the company says.