NP-41 Emulator (may be)
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04-06-2016, 11:43 AM
(This post was last modified: 04-06-2016 12:12 PM by emece67.)
Post: #211
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RE: NP-41 Emulator (may be)
(03-09-2016 06:21 PM)Chris Chung Wrote:(03-09-2016 03:35 PM)Harald Wrote: I think the build will be easy with those instructions. That's interesting. I've searched a bit and have found another approach, named "charlieplexing" that allows scanning a 42 switch keypad with only 7 pins. It also uses 7 diodes. In general, such approach, when using n pins, can scan up to \(n*(n-1)\) switches, requiring n diodes. I'm now studying it to see if it can handle (with the aid of software) the simultaneous activation of 2 switches. |
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