Re: Can I do this with a uProcessor?



MooseFET wrote:

Eeyore wrote:
MooseFET wrote:
"tempus fugit" wrote:

I've read each one carefully, and some a number of times actually. Lots of
reading, but I'm still not quite understanding everything yet.

Draw a bunch of lines on paper, like you are making graph paper.

The vertical lines are wires
The horizontal lines are wires
Every place they cross is a switch.
The wires do not connect to each other other than via a switch.

Look, he's new to this and frankly his first MCU project doesn't need
keyscanning to save I/O lines and it would likely degrade his background noise
with a nasty buzz.

The suggested method I gave elsewhere shows how to do it without a
buzz.

It looks like I missed that one. I'm curious how that can work though.


I agree that he really doesn't need scanning. If he was willing to
use double pole switches he could get the higher density without
scanning. If he uses a really good micro like an 8051, he can just
wire the switches straight to the ports as pull downs.

That's exactly what I do. To save passives if you use ports that have pull-ups built
in you'll even save (primarily the space of) any external resistors.

Graham


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