[TriEmbed] Circuit Help

Josh Wyatt dragojdw at gmail.com
Fri Dec 4 12:13:12 CST 2015


To further Pete's suggestion- you can use a single DPDT or two SPDT relays
to accomplish this.

Here's a nice 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> 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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