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If you want to use a standard keyboard, ignore everything I'm about to say. If you are willing to build your own hardware, 74HC165 ICs strung in series can read as many simultaneous inputs as you want. https://forum.pjrc.com/index.php?threads/sn74hc165-shift-register-revisited.48730/ This...

Glad to hear it. I have a business too and know the ups and downs of product development. Lots I want to do, limited time and resources. Just know there a lots of out here wishing you well and best of success.

I have a similar problem. Plus getting durable micro USB cables at a good price is becoming more difficult. So I've designed and ordered a USB-C to micro USB board. 50 for about $100. I couldn't guarantee height or distance, so it's meant to be adaptable. The idea being you can solder in...

Ran into another reason to switch to r USB-C connectors. It's rapidly becoming hard to find high quality micro USB cables. The writing's on the wall for them. Anker, Monoprice, etc. are down to a couple choices each and more expensive than in the past. Lots of choices still on Amazon, but...