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Originally Posted by ChrisA
Just don't set both to 1 because that won't work.
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This is true in this case Chris, but as an FYI it can work in some cases.
Take the case that you are controlling two pneumatic devices with a single Spike. Electrically you would connect one pin of each of the solenoids to ground and the other to either the M+ or M- on the Spike. Then in software the relayX_fwd controls the device plugged into M+ and relayX_rev controls M-. (Note that you only get on/off functionality with this method) By setting both to one, both devices would be controlled.