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Re: Pneumatics, solenoids and frustration
Since your code is good, as evidenced by the module LEDs, and you have the required pilot pressure...
You checked the Breakout voltage, so the other possibility that occurs to me is that the solenoid wire pair are reversed where they plug in to the Solenoid Breakout.
ground <-> signal
Try reversing the 2-pin connector to see if that helps.
It won't hurt the solenoid to plug it in backwards, but the light on it can still come on.
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