My friend, fellow former Parallaxian, and partner at EFX-TEK John Barrowman wanted to build an electronic Ouija Board for Halloween and for future trade shows. It's really very simple, and a derivative of our Stranger Things wall from this year's Transworld show.
Parts (that we used)
-- EFX-TEK HC-8+ Controller
-- HM-10 BLE Radio
-- Brilliant Bulb Christmas lights from www.holidaycoro.com
The program is simple. When a string comes in from a phone via the BLE module, it is compared to a list of known commands. If the string is a command that is executed. There are commands to change the background color (10 colors), the spelling color (10 colors), and shortcuts for Yes, No, and Goodbye. If the received string is not known to the program, it is spelled out on the letters and numbers.
The picture is of John's step-son Ollie on Halloween. He said nothing to the trick-or-treaters. John was in earshot manning the candy bowl. Of course, he was running a BLE app to send strings so he could send the answers to the Ouija board while TOTs thought he was checking email. It was a big hit, and I'm writing about the code in my January column.