Hi All, I have an output from a device which is high, then goes low. I need to add a delay to this output such that it stays high for a further 30s, then operates a relay. Now, I need this to be replicated across a number of machines by relatively unskilled people, so building individual circuits for each one is out of the question. I'd therefore like to use COTS parts, if possible which can just be wired up using a wiring diagram. I can't modify the existing machine, either. There are a number of relay boards on eBay and elsewhere which offer delay functions, but to be honest I'm having difficulty working out the details of what they do! Descriptions are vague or in Chinglish.. So, has anyone had any experience of such modules and can recommend one? It needs an input which when taken low, waits around 30s before closing the relay contacts. If the input goes high again within the 30s then the relay contacts need to remain open; low again and the 30s delay cycle starts again. Anyone know of anything suitable? Thanks!