[TriEmbed] Circuit Help

Mark Sidell mark at sidell.org
Fri Dec 4 12:41:27 CST 2015


Oh, just for fun let's throw in another one...

It looks like the valve only draws 500 mA, so another solution might be an
h-bridge motor controller like this one:

https://www.sparkfun.com/products/9457?gclid=Cj0KEQiAkIWzBRDK1ayo-Yjt38wBEiQAi7NnPzpApRz_AelXlv20-7_opMojKVRmnl-3T45dF-4cX4UaAv9s8P8HAQ

On Fri, Dec 4, 2015 at 1:35 PM, Brian via TriEmbed <triembed at triembed.org>
wrote:

> Looks like all the simple solutions have been presented!  Two relays is
> the way to go.  I favor the SPDT approach; only one relay ever needs to be
> engaged at once (and both engaged is another "off" configuration).
>
> -B
>
> On 12/4/2015 1:13 PM, Josh Wyatt via TriEmbed wrote:
>
>> To further Pete's suggestion- you can use a single DPDT or two SPDT
>> relays to accomplish this.
>>
>> Here's a nice allaboutcircuits.com <http://allaboutcircuits.com> post
>> about it:
>>
>> http://forum.allaboutcircuits.com/threads/reversing-polarity-with-spdt-relays.30679/
>>
>> Let me know if you need more help!
>>
>> Thanks,
>> Josh
>>
>> On Fri, Dec 4, 2015 at 1:07 PM, Pete Soper via TriEmbed
>> <triembed at triembed.org <mailto:triembed at triembed.org>> wrote:
>>
>>     Just string together a few plain relays.
>>     -Pete
>>
>>
>>     On 12/04/2015 12:51 PM, Grawburg via TriEmbed wrote:
>>
>>         I have a quarter-turn ball valve with a 12V actuator [HSH-Flo
>>         1/2" DN15 12VDC CR-05 FNPT SS304 Position Feedback Motorized
>>         Electric Ball Valve.]  I'm using opto-isolated relay activated
>>         by a Raspberry Pi but can only control one direction because the
>>         valve reverses direction by flipping the leads. If I was doing
>>         it mechanically I would have a double pole triple throw rotary
>>         switch. I cannot find a suitable opto-isolated relay that is
>>         2P3T...at least one that doesn't cost a fortune. Any suggestions
>>         to help me think this through would be welcomed.
>>
>>
>>         Thanks,
>>         Brian Grawburg
>>
>>
>>
>>
>>
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>
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