just to pick up on one of Stan's comments earlier - essentially why do this when there are commercially available boards for not much more money. One aspect of those boards - the one I'm familiar with is from Dallee (with whom I have no connection other than as a customer) - is that they are set up so if the power is interrupted for more than a few seconds, the engine resumes running forward rather than having to go through the complete forward-neutral-backward-neutral-forward cycle. They also have the benefit of having connections/outputs for things like directional lighting
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