Heh! Good ideas all, but I'm afraid it's a little more mundane.
It's going to be a multi-level controller for my seat heaters. Never liked the look of the kit switches or the just two levels (too hot and not hot enough) of the basic heaters, so I'm replacing the switches with modified Honda (scrapyard) backlit push button switches. The controller will register how many times the buttons are pressed and then activate solid state relays in an 3 second on-off cycle to modulate the heat. In theory I could go to many levels, but I'm only extending it to 3 levels - Lo/Med/High - with Red/Blue Leds in the switches being turned on - blue/purple/red - to indicate the level chosen. There's also a config function so I can adjust the on/off cycle for Lo and Med levels on each side in the car to adjust how I (or my wife) likes it. I've already written all the code in assembler (it's been a looooong time since I wrote code) and that was great fun.
May seem like overkill for a microcontroller, but these chips are so low cost, ~$2 for the 44A, and they contain all the driver circuitry, it was actually the cheap way to go!
Bob, I probably will solder in the chip for physical security. I kept the in-circuit programmer header (the six-pin box at the bottom) so I can load or update the program in situ.
This is the icon I'll use on the switches - note it's a Kappa seat silhouette!
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