@codecage Thanks to all for your feedback! Mr codecage, this looks like a pretty simple method which I will try out next time I am gadgeting. Cheers...

Have you considered using your existing relay to trigger another relay which could supply reversed polarity to your device after your built in delay?

@frogandtoad Thanks for that analogy. That makes it very clear that I will put the heavy batteries up top. Cheers!

A human will emit effectively the same temperature wavelength as a squirrel or a bird, but the human is a bigger heat source, so is more likely to tri...

Thanks for your comments Ruplicator. I have spent a few hours following your recommendations. I have found that my two cheap Chinese motors just do no...