a real challenge

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=63292
Printed Date: May 17, 2025 at 2:07 AM

Topic: a real challenge

Posted By: llewxamtterb
Subject: a real challenge
Date Posted: September 26, 2005 at 3:09 AM

I've been throwing this idea around in my mind for a few months now and I still can not figure out how to do this with relays, maybe you can help...?

I want 4 different 12v outputs controlled by 2 momentary buttons, only 1 output is active at any given time. The 2 momentaries are essentially up/down buttons changing the output from 1 to 2, 2 to 3, 3 to 4 with the "up" button and 4 to 3, 3 to 2, 2 to 1 with the "down" button. If it's on 1 and the "down" button is pressed it just stays on 1. If it's on 4 and the "up" button is pressed it just stays on 4.

Any ideas?

Replies:

Posted By: KPierson
Date Posted: September 27, 2005 at 5:06 AM

Thats a tough one. I worked on it for a bit and had 12 relays and it wasn't done. You will either need to simplify the system (only count one way and let it cycle (1 - 2 - 3 - 4 -1 - 2...).

There are much easier ways then relays to do what you are trying to do!

What exactly would you use this for?

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Kevin Pierson

Posted By: llewxamtterb
Date Posted: September 27, 2005 at 10:42 PM

if you can think of another method shy of using a PLC, I would love to hear it. I want it for a gear shifter.

Posted By: KPierson
Date Posted: September 28, 2005 at 7:22 AM

Well, thats easy then. Use a microcontroller. Very similar to a PLC, but small (one IC chip). Programmable to do whatever you want, and not that hard to program (although they arn't as simple as ladder logic).

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Kevin Pierson