Old 02-14-2017, 04:45 AM #17
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Default Re: Head scratcher - can I make this circuit from relays, diodes and switches only?

Quote:
Originally Posted by Cyparagon View Post
Good god, no one wants to wire up 47 relays to turn a motor, Sean. That's when you give up and switch to arduino.

Here's what I came up with. It's basically a low-tech H-bridge to switch polarity. One obvious weakness is that it shorts 12V if you press the power button while one of the limit switches is not engaged. A DC breaker would remedy that, though. I'm sure it could be improved, but like I said, first draft.

That is very sharp. It took me a couple minutes just to figure it out (I didn't catch on to the fact that those were NC end stops at first).

I do need to figure out a way to avoid the short, because it's possible that the circuit could be triggered when the mechanism has slacked somewhat and released from the end stop.


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Old 02-14-2017, 12:18 PM #18
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Default Re: Head scratcher - can I make this circuit from relays, diodes and switches only?

For myself, I'd just use a three position DPDT switch wired to reverse the polarity when switched from side to side, but off when in the middle position.
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Last edited by Alaskan; 02-14-2017 at 12:30 PM. Reason: Change my mind on what to use, then edited to DPDT.
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Old 02-14-2017, 12:23 PM #19
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Default Re: Head scratcher - can I make this circuit from relays, diodes and switches only?

The problem with a push ON-push OFF button is that you would
need to push the 1st button back OFF before you pressed the
2nd button ON after the limit switch stopped the 1st motor
direction. I could be wrong. Didn't see your complete circuit idea.

Jerry
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Old 02-14-2017, 12:26 PM #20
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Default Re: Head scratcher - can I make this circuit from relays, diodes and switches only?

Yea, I saw the problem and edited my post while you were writing yours.
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Old 02-14-2017, 12:30 PM #21
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Default Re: Head scratcher - can I make this circuit from relays, diodes and switches only?

N/P.....


Quote:
Originally Posted by Alaskan View Post
For myself, I'd just use a three position DPDT switch wired to reverse the polarity when switched from side to side, but off when in the middle position.
That makes sense... Even if you only had a push button...
you would still need a human action to push it again...
So it's not a greater leap to push the 3 position switch to
the other side and you save 2 relays and diodes.

Jerry
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Last edited by lasersbee; 02-14-2017 at 12:36 PM.
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Old 02-14-2017, 12:46 PM #22
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Default Re: Head scratcher - can I make this circuit from relays, diodes and switches only?

Wiring info here: HOW TO: Wire a DPDT rocker switch for reversing polarity

or go here for lots of circuit diagrams:

https://www.google.iq/search?q=three..._AUIBigB&dpr=1

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"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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Last edited by Alaskan; 02-14-2017 at 01:04 PM. Reason: Added image
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Old 02-14-2017, 05:08 PM #23
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Default Re: Head scratcher - can I make this circuit from relays, diodes and switches only?

Quote:
Originally Posted by Alaskan View Post
The only things that would need to be added are the
2 end limit switches.

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Last edited by lasersbee; 02-14-2017 at 05:10 PM.
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Old 02-15-2017, 01:39 AM #24
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Default Re: Head scratcher - can I make this circuit from relays, diodes and switches only?

Quote:
Originally Posted by rhd View Post
I do need to figure out a way to avoid the short
I'm not seeing an idiot proof solution that doesn't require adding at least two more relays. Is two more relays too hairy?

Having a button for CW and a button for CCW would be ideal. Even then, some jackass could push both CW and CCW to short it.

A breaker is a common way to make circuits idiot-resistant. Why is a breaker not an option for you?
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Old 02-15-2017, 03:50 AM #25
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Default Re: Head scratcher - can I make this circuit from relays, diodes and switches only?

Limit switches to break the power if they hold the switch down too long would work fine, simple to do. You can get spring loaded DPDT switches too, so they don't stay in one position or the other. See if some idiot can screw that up, not.
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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Old 02-15-2017, 12:38 PM #26
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Default Re: Head scratcher - can I make this circuit from relays, diodes and switches only?

Quote:
Originally Posted by Cyparagon View Post
I'm not seeing an idiot proof solution that doesn't require adding at least two more relays. Is two more relays too hairy?

Having a button for CW and a button for CCW would be ideal. Even then, some jackass could push both CW and CCW to short it.

A breaker is a common way to make circuits idiot-resistant. Why is a breaker not an option for you?
The two button approach problem of hitting both at
the same time could be solved using a DPST switch
instead.

Jerry
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