Re: Digital push-button selector switch?

On Aug 22, 2:39 am, Tom2000 <ab...@xxxxxxxxxxxxx> wrote:
On Tue, 21 Aug 2007 21:23:58 -0700, liberalsur...@xxxxxxxxx wrote:
Hello Friends,

I'm trying to build a selector switch using momentary push-buttons to
achieve the following effect: you have a row of push-buttons each with
an LED next to it. When you push one of the buttons, its LED lights
up. When you push a different button, the previous LED goes out, and
the new one (next to the switch you just pushed) goes on. In this way
you get the effect of a digital selector switch.

I've come up with a few design ideas, but I can't quite get it to
work. Here's an example (the boxes are S-R flip-flops)

<http://ayeats.nfshost.com/schematic_draft.gif>

Any help you might be able to provide would be greatly appreciated. I
feel like I'm missing something very obvious here.

Thanks very much for your help,

Andrew

This is the sort of app that's begging for a small, cheap, simple
micro. One chip will do the job easily.

There are many that would serve. My first choice would be a Picaxe
18X, which won't require that you buy a programmer or facce a steep
learning curve. Free development system and easy to program for small
tasks such as this one.

http://www.rev-ed.co.uk/picaxe/

Good luck!

Tom- Hide quoted text -

- Show quoted text -

I absolutely agree. One inexpensive chip will take care of debouncing
and logic for this application.

Andrew - Once you try out a micro for stuff like this, you will never
go back to discrete logic chips. Even the ubiquitous 555 timer is
being replaced by an 8-pin micro because of the flexibility and
accuracy.

BRW

.

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