Originally Posted by war4peace
Aquaero 6 has one relay built-in already. If you only need one, you're already covered. Also, relays are pretty small, here's a related thread (driving solenoid valve using a relay
You are right, I had in mind this picture of bulky relays which probably was coming straight from the '80s
At the end could be even save space using a relay that small and I wouldn't need anything else.
But, as yous said, there's only one relay port on the aquaero and I have the ATX 24pin adapter for the emergency shutdown to connect there.
I'll probably go this way, sacrifice the ATX adapter at the beginning and later connect the relay to the featherboard.
Thanks a lot for the tip!