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12V push button 2 way switch

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Re: 12V push button 2 way switch

Postby Lurker » 28 Nov 2020, 11:41

I have some solid state relays and can send you one if you decide to go down that route.
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Re: 12V push button 2 way switch

Postby Mike G » 28 Nov 2020, 11:50

novocaine wrote:You add the relay so you can have a flip flop state change. Push once it goes up push again and it goes down. The issue i cant figure is the 3 states up,off,down. But leave it with me.

Just like you asked for.


Well, I'm sure you guys who know about these things know how to make it work, but isn't it slightly more complicated than that? There's an end-of-run stop to account for, too, in each direction.
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Re: 12V push button 2 way switch

Postby novocaine » 28 Nov 2020, 14:14

Why? You havent got one now.
All im thinking is momentary same as now so you control when it stops. It would be a non latching relay. All its doing is giving you a low voltage side for the control.
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Re: 12V push button 2 way switch

Postby Mike G » 28 Nov 2020, 14:21

Yeah I have. I've got an over-centre device which is going to flip the other 2 way switch to off. So interlinked switches each changing the state of the circuit every time they're moved.
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Re: 12V push button 2 way switch

Postby novocaine » 28 Nov 2020, 15:22

Ok smarty pants. :p I'll shall stop.

Crack on. I want to see it. :)
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Re: 12V push button 2 way switch

Postby Mike G » 28 Nov 2020, 17:46

So do I! :)

When it doesn't work, I shall be listening carefully to you people who know what you're talking about.......
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Re: 12V push button 2 way switch

Postby Robert » 28 Nov 2020, 18:05

I spent 10 minutes doodling a circuit diagram with relays and microswitches and didn't come up with a solution. May have another go sometime. I'd like to see how your plan will work out too :)
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Re: 12V push button 2 way switch

Postby 9fingers » 28 Nov 2020, 18:56

Something like this, I did a few years back

viewtopic.php?f=23&t=1665&hilit=planer+lift&start=50

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Re: 12V push button 2 way switch

Postby Mike G » 28 Nov 2020, 19:30

Do we have a means of posting video of our own stuff here? I'm just imagining pushing the carving and the TV popping up, then pushing it again and it putting itself away.........and none of you buggers believing me! :) Seriously, I manage to take the occasional video by accident, so I'm sure I could manage to take one on purpose. What then?
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Re: 12V push button 2 way switch

Postby 9fingers » 28 Nov 2020, 19:56

Mike G wrote:Do we have a means of posting video of our own stuff here? I'm just imagining pushing the carving and the TV popping up, then pushing it again and it putting itself away.........and none of you buggers believing me! :) Seriously, I manage to take the occasional video by accident, so I'm sure I could manage to take one on purpose. What then?


put it on YouTube it’s dead easy

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Re: 12V push button 2 way switch

Postby Pete Maddex » 01 Dec 2020, 22:55

Mike you need a flip-flop to switch a relay and limit switches to stop the motor at each end.

https://www.ebay.co.uk/itm/1PC-6-24V-Fl ... 0005.m1851

I will try and do a diagram tomorrow.

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Re: 12V push button 2 way switch

Postby Robert » 02 Dec 2020, 00:20

Pete Maddex wrote:Mike you need a flip-flop to switch a relay and limit switches to stop the motor at each end.

https://www.ebay.co.uk/itm/1PC-6-24V-Fl ... 0005.m1851

I will try and do a diagram tomorrow.

Pete


Interesting challenge isn't it :)

I've not gone back to it but I included a latching relay in my incomplete circuit. I'm assuming the motor needs reversing when the limit switch is tripped and needs to stay that way until the other limit switch gets tripped and so on... and that's where I gave up :)
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Re: 12V push button 2 way switch

Postby Mike G » 02 Dec 2020, 08:01

The thing is, guys, my motive power is an old drill, which has a built-in reversing switch. I shall simply detach this and locate it where I need it. Hopefully it's something I don't need to think about it too much, and it's the reason I chose to use a drill for the job in the first place. All I really have to do is organise the start and stop switching.
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Re: 12V push button 2 way switch

Postby John Brown » 02 Dec 2020, 08:35

Are you hoping to be able to reverse direction mid travel?
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Re: 12V push button 2 way switch

Postby Mike G » 02 Dec 2020, 08:43

No. My plan is to have the reverse switch activated by an over-centre sprung mechanism on the edge of the platform, so it is mechanically triggered by the platform reaching either the top or bottom of its run, but momentarily after the motor has switched off.
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Re: 12V push button 2 way switch

Postby John Brown » 02 Dec 2020, 09:09

In that case, I'd have thought micro switch at each end, and momentary manual switch. Similar to the old windscreen wiper self parking system.

A bit fiddly, though, I'd have thought, to get it all adjusted. Especially if you're hoping to activate switches on the overrun on a low geared worm drive. It cries out for an Arduino or similar device and a relay or two. That way you could add things like a time out, or even current sensing to detect obstructions, like electric windows on cars.
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Re: 12V push button 2 way switch

Postby John Brown » 02 Dec 2020, 09:30

Anyhow, if you're happy with your reversing switch ( which could be achieved with double pole change over micro switches at each end, with one set of contacts wired like two way light switch), then the upper and lower limit switches normally closed contacts in parallel, so no power to drill if either are activated, then have your manual switch , normally open, and wired in parallel with the two . I'll draw a sketch when I'm at a proper computer.
The downside is that you need to hold the manual switch until the mechanism has started moving.
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Re: 12V push button 2 way switch

Postby John Brown » 02 Dec 2020, 09:35

Edited post above. Changed series for parallel..
Holdon. I have to draw this...

Series. I was right first time.
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Re: 12V push button 2 way switch

Postby Pete Maddex » 02 Dec 2020, 09:44

This is what I have come up with.

TV actuator .jpg
(68.75 KiB)


It uses a push on/push off switch to swtich a relaychanging the direction of the motor and limit switches to stop the travel, you just need some beefy microswtiches and a relay.

I would make sure that the relay is on in the up position.

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Re: 12V push button 2 way switch

Postby John Brown » 02 Dec 2020, 09:53

IMG_20201202_084705.jpg
(212.05 KiB)
I am struggling to a a picture from my phone.
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Re: 12V push button 2 way switch

Postby Sheffield Tony » 02 Dec 2020, 10:00

This sounds tricky to me. I'm an electronics type so would normally turn to an electronic solution rather than mechanical. If you use separate limit and reversing switches, you have to take care they both get triggered - so it doesnt hit the reverse switch first and sit bobbing up and down, or hit the limit switch and stop before hitting the reverse, so get stuck.
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Re: 12V push button 2 way switch

Postby John Brown » 02 Dec 2020, 10:03

Like I said, this assumes Mike is happy with his reversing arrangements.

If not, then I agree he needs a relay.
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Re: 12V push button 2 way switch

Postby John Brown » 02 Dec 2020, 10:05

Sheffield Tony wrote:This sounds tricky to me. I'm an electronics type so would normally turn to an electronic solution rather than mechanical. If you use separate limit and reversing switches, you have to take care they both get triggered - so it doesnt hit the reverse switch first and sit bobbing up and down, or hit the limit switch and stop before hitting the reverse, so get stuck.

I agree wholeheartedly. Definitely an electronic solution would be the way to go.
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Re: 12V push button 2 way switch

Postby Pete Maddex » 02 Dec 2020, 10:20

Did you see my diagrame? its very simple, I can't see how electronics would help, it just needs a switch a relay and a couple of limit swtiches.

We don't need Mike to learn electronics :D

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Re: 12V push button 2 way switch

Postby John Brown » 02 Dec 2020, 10:30

Agreed. It would work perfectly. You have to be able to persuade Mike about the relay.
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