Author Topic: Converting laptop board to standalone  (Read 673 times)

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Offline sexzual

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  • Location: WI USA
Converting laptop board to standalone
« on: Wed, 11 July 2018, 16:48:41 »
Hey guys. Have an Alps board out of a 91 moden laptop. Looks like it's just switches and the controller was inside the laptop. I'm hoping to wire this up to a pro micro (enough pins?) and build a case for it to use it as a standalone keyboard. I've built my share of converters, but nothing like this. Where do I start / any guidance would be greatly appreciated.  Thanks

Offline suicidal_orange

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Re: Converting laptop board to standalone
« Reply #1 on: Thu, 12 July 2018, 09:11:26 »
Is there another row of connectors under the cable?  For 83 switches you need at least 19 pins (10x9 matrix would allow for 90) and there are only 10 visible.  When you know how many there are you can compare to the number available on the Pro Micro.

Basically you need to work out which switches are connected to each other, but it's a one sided PCB using switches with two pairs of pins which are used to bridge over connections.  I tried to map one group and it seems some of the switches are mounted sideways - I have so much respect for the guy who designed these boards, it shouldn't be possible :))  I've attached my attempt but not confident due to possible switch rotations and apparently redundant connections, even if it is right there are more connected parts I'm sure...

If you don't like the 'colouring in' option you can map out the connections however your mind works - I've used a multimeter to test the connections and noted them in a spreadsheet with two columns for each switch which which worked out OK.

Any questions please ask, I like saving old boards so it's no problem at all.
Ducky Zero, MX Reds    JD40, Jailhouse Blues           GH60
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