Write it in the Air
thingiverse
A user's tiny hand control device enables them to scribble a message in mid-air simply by waving their fingers. This gadget relies on an Arduino NanoV3 to craft the message in a straightforward, uncomplicated manner. Compose your message within Excel and specify HIGH or LOW for each LED within the sketch. An example sketch is included; however, the heart may require some revisions. The message will continue to display continuously. If you replace the fixed connection with a reed relay and modify the program accordingly, the text can initiate at a predetermined spot where the relay is activated by a small neodymium magnet. A 9-volt block battery provides the power source.
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