a real challenge

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llewxamtterb

Member - Posts: 2

Joined: September 26, 2005

Posted: September 26, 2005 at 3:09 AM / IP Logged

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?

KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: September 27, 2005 at 5:06 AM / IP Logged

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?

Kevin Pierson

llewxamtterb

Member - Posts: 2

Joined: September 26, 2005

Posted: September 27, 2005 at 10:42 PM / IP Logged

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.

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: September 28, 2005 at 7:22 AM / IP Logged

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).

Kevin Pierson

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a real challenge

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