Quote Originally Posted by Clive S View Post
For those that are interested I can confirm that the bob in question does need both 5V and 12-24v to get it to work.

Also when say 12v is applied I can also confirm that the input pins are pulled high so that a simple switch to ground will be fine.
Clive - the doc says "12-24V optional". I'm pretty sure that I've seen someone else talking about a similar BOB where 5V supplied the board but there was no analogue out without the extra supply. But it could have an internal regulator supplying 5V if you do use the higher-voltage supply, I guess. Docs on this Chinese stuff are a nightmare! Personally, I'd start with the 5V connected to the +5V terminal and begin testing. My first BOB was a ZP5A which was broadly similar but no analogue out, so haven't played with the one in question. OP has 5V and 12V available so at least it won't mean an extra PSU either way.