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LPT Switch
mnm1200:
This looks interesting. I took a look at the link (the translated one is dead) and I found this: http://users.skynet.be/plipke/PF50HC/LPTswitch/index2.html
Something written about it in English. Gomen if someone posted this and I missed it.
If this works, it'll solve a lot of problems =D
oldsage:
--- Quote from: mnm1200 on January 18, 2005, 05:32:21 pm ---This looks interesting. I took a look at the link (the translated one is dead) and I found this: http://users.skynet.be/plipke/PF50HC/LPTswitch/index2.html
Something written about it in English. Gomen if someone posted this and I missed it.
If this works, it'll solve a lot of problems =D
--- End quote ---
I was about to post it last night (+2 GMT - i live in israel [but i'm moving to the US in 7 days]), but i was tired so i went to bed...
Me-sa-so-laaazy.... ;)
Anybody knows something about it? It seems like a "development" of the first one...
oldsage:
BTW, this might be helpful too...
(if someone wants to design their own circuit, this might come in handy... ;))
Samstag:
I just finally noticed this thread.
The circuit in the original post looks pretty much like what we use in flight simulation to take inputs from massive numbers of aircraft circuit breakers (several hundred is not uncommon). Any ghosting or blocking in an FAA-certified sim would be unacceptable and we don't have any issues. The important factor is that you have one diode per switch.
Putting a resistor on each row and column would be a good idea to protect your parallel port hardware. I don't know what they can handle for current.
That said, if I needed another encoder I would probably buy another IPAC.
brained:
Hey I've finished my interface last night, but I didn't have the chance to try it out, I might post pics and my results tonight. ;D
cheers