[TriEmbed] Circuit Help

[Brian]

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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