Rich Quinnell, editor in chief of Microcontroller Central, created an LED hand message board to display a message in the air.
Using persistence of vision, the LEDs trace out a message in mid-air when the hand is waved back and forth. Rich got the idea after a reader sent in a picture of himself waving a circuit board with LEDs that displayed a message in the air. He modified the original software so he could have a choice of different messages.
Rich Quinnell's hand message board uses LEDs to trace out a message in mid air when the hand is waved back and forth.
Some improvements Rich suggests are adding a keyboard for an unlimited amount of messages, and to make the one inch of text space bigger so the messages can be seen from further distances.
Jon, thanks. The board does have an accelerometer and it is what triggers the display. It was a challenge, though, separating out the gravity signal from the motion signal. Also, I owe a lot to my blogger Ryszard Milewicz, who started this with a program that displayed the I heart MCC message when he waved it around in his hand. I "featureized" it a bit, adding the multiple message capability and adjusting the display timing somewhat. Oh, and it's my hand.
Hi Rich, Very clever approach to developing a cool embedded product. The method of modifying code to change the product functional behavior is what I discuss with my ITT Tech Electrical Engineering Tech students every class period. I often use this rapid development method for embedded devices and gadgets I create in my home lab as well. Very cool project!!!
Some of my code would make a grown C programmer cry too, RichQ. What some folks might call "spaghetti code" I prefer thinking of as "thinking outside of the box" :) Besides, since I am Italian, the moniker fits in my case LOL
Rather than reinventing the wheel - you simply readjusted it - a great time saver that still took tech know-how - Great job!
In our third annual contest, Design News and Allied Electronics are going to crown a winner in early 2016 for the best reader gadget submission this year, and once again, you, the readers, are the judges!
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