Any Electronics Engineers on here (1 Viewer)

[Steve and Denise]

I am looking to wire a motorised valve with a DPDT relay 12v for motor reversal this in its self is straight forward but as I want to add a remote control I think I would need a relay with a two coil solenoid that would latch as I want the coil not to take any power once it has thrown. Or would I have to use two relays.
The other option is to use an IC for control any ideas.

I have a small remote unit that has + - + output.

 

[Gromett]

Have a look at Power FET's They use practically no power. Have a look at a cheap arduino board, use logic level FETs such as the IRL540.
You can then add a simple blutooth, wifi or direct radio controller module.

Not sure what you are doing or the components you are using but that should be enough to head you in the right direction?

 

[Gromett]

PS:. For motor control look at an H Bridge. 4 FETS, 4 Diodes and an arduino.

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[tonyidle]

I can come up with a simple reversal circuit. I assume it's a 12v motor. How does it stop once it has done its job? Is the remote wired or wireless?

 

[Gromett]

Really could do with more details on the power of the motor and what you are using it for...

 

[Steve and Denise]

It is a motorised valve max 2A I am assuming the valve has a limit switch at full travel (fully open) or (fully closed)
I will be using a wireless remote as in one of the off the shelf from ebay.
The last one I did was a three wire valve so a simple - and two feeds f/r but the one fitted to our Hymer has only two wires so have to change polarity.

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[Steve and Denise]

I should have said ics are a bit beyond my capability @Gromett

 

[Richard n Ann]

Is it for dumping grey waste?

 

[Gromett]

I should have said ics are a bit beyond my capability @Gromett

Arduino is extremely simple and logic level FET's are very simple components.
You don't need to worry about things like biasing, or any other ancillary components. The only thing you need with a fet when driving an inductive load is a diode to stop the high voltage spikes frying the FET.

It really is simple. Loads of support for this kind of thing on the Arduino forums.

If you don't fancy building it yourself you can buy an arduino compatible H bridge module off ebay for a couple of £. But without details of the motor I couldn't tell you which one you would need.

Here is an example.


Please note I am not recommending this one, just an example that came up first on ebay.

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[Steve and Denise]

Is it for dumping grey waste?

Yes

 

[Gromett]

Yes

What is the voltage and current draw of the motor? And does it have switches to detect when it has reached full open/closed?

 

[Steve and Denise]

The motor is 12v dc max 2a and I think it has limit switch on each direction I am going to connect a meter in line to check current draw this will also confirm limit switching.

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[andy63]

I put motor operated drain valves on my self build... manually switched by reversing the polarity... they have no limit switches.. on as long as you hold the switch down...
Andy..

 

[pyro]

In my view, Arduino is probably an overkill, although I agree it is a simple and elegant way to achieve what is required.

Perhaps a simple 12V normally closed two port appliance valve http://uk.rs-online.com/web/p/produ...bKOD4hbH33j6Dcj2r1caAk3REALw_wcB&gclsrc=aw.ds

Plus an (overpriced) 10A remote switch from Amazon

eMylo® DC 12V 1 Channel One Relay Wireless Remote Transmitter RF Remote Control Light Switch On Off Transmitter

Little to be wired, no external relay, job done for less than £15

 

[Gromett]

In my view, Arduino is probably an overkill, although I agree it is a simple and elegant way to achieve what is required.

Perhaps a simple 12V normally closed two port appliance valve http://uk.rs-online.com/web/p/produ...bKOD4hbH33j6Dcj2r1caAk3REALw_wcB&gclsrc=aw.ds

Plus an (overpriced) 10A remote switch from Amazon

eMylo® DC 12V 1 Channel One Relay Wireless Remote Transmitter RF Remote Control Light Switch On Off Transmitter

Little to be wired, no external relay, job done for less than £15

How would you reverse the motor and how would a single channel remote control switch it on and off AND reverse the motor?

That valve is probably not suitable for grey waste?

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[Gromett]

The motor is 12v dc max 2a and I think it has limit switch on each direction I am going to connect a meter in line to check current draw this will also confirm limit switching.

If you bought this online, can you send me a link to it please.

 

[Steve and Denise]

No grommet it was already fitted to the van from new with a rocker switch in the garage the latest van now has a switch in the cab.

The last one I fitted was a motorised ball valve of ebay brass and stainless very good for about £25, not sure how to put a link to ebay.

 

[Steve and Denise]

https://www.ebay.co.uk/itm/New-2-Wa...hash=item3cfb2a63be:m:m9VkEGcqUzpxWThU21AOzCQ

Try this

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[pyro]

How would you reverse the motor and how would a single channel remote control switch it on and off AND reverse the motor?

That valve is probably not suitable for grey waste?

It is a self returning, normally closed solenoid operated diaphragm valve, it only needs activation to open, no limit switches and takes less time to install than it does to edit an Arduino sketch Nothing to go wrong. Single channel switching is ideal, simple solution

Washing machine waste valve, IMO eminently suitable for grey waste

From the link: http://uk.rs-online.com/web/p/produ...bKOD4hbH33j6Dcj2r1caAk3REALw_wcB&gclsrc=aw.ds

Two-way Solenoid Valves
Two-way solenoid diaphragm operated, normally closed valves are ideal for controlling water pressure 0.2 to 10 bar. The valve is continuously rated when the fluid temperature is below 25°C, the ambient temperature is below 60°C and the flow rate is above 5 L/min. A duty cycle of 40% is required for fluid temperatures up to 90°C

Features and Benefits
Application Information
• Coil can be located in any one of eight positions
• Maximum flow rate: 17 L/min
• 0.2 bar to 10 bar pressure range
• Power consumption: 4 W
• Nylon 6 body with 1/2 inch BSP ports (can be base mounted)
• 1/4 inch spade coil terminals
• In the 12Vdc/24 V/ac version, the solenoid coil is wound so either voltage can be passed through it

Typically used in hand washers, refrigeration equipment and automatic tap systems.

Less than £15, nothing to go wrong IMO. KISS applies

 

[Gromett]

It is a self returning, normally closed solenoid operated diaphragm valve, it only needs activation to open, no limit switches and takes less time to install than it does to edit an Arduino sketch Nothing to go wrong. Single channel switching is ideal, simple solution

I missed that

However for suitability I was also thinking about things like food waste in valve. The bore of the valve doesn't appear to be big enough for the application? Also suitable for use in the location. Wouldn't work on my van because my waste valve is currently outside the van. However I do remember on my Eura it was inside but on my Hymer it was also outside.