I have created a stencil with my design for screen printing (pictured below). With this I’ll have regions or “pixels” or thermochromic ink.
In the link below I have a time lapse of a heating pad changing the color of the thermochromic ink. My plan is to have one heating pad or element for each of the “pixels” so that a user can input different designs.
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Finally, I have recently found an Android app that lets you create a simplistic GUI to communicate with Bluetooth low energy. I should be able to start making the user interface now that I got a hold of my old android phone.