Using Arudino to control 250 12v Solenoids

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interested in community's thoughts , guidance on how execute large array of 12v solenoids.

context single controller box containing array of 50 250 relays open grid of solenoids
one @ time adjustable amount of time.

what details in providing kind of scalability?

goddamn, lot of relays!

probably long chain of shift registers used.


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