Bummer! failed to call stepper

A diode placed across the motor if it is to only rotate in direction could protect the Photon.

This is written without having seen a diagram of the circuit or having knowledge of your goal.

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For stepper motors that’s not an option as the coils will always be energised both directions alternatingly.

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Sorry…only saw motor, not stepper. Of course you are correct. I just came to the party too late. Grin…

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