5v optocoupler relay

Machine: K40

Board: _Cohesion3d

Firmware: _Smoothie

Problem/ Question: _Hi guys has anyone use an optocoupler 5v relay to control the extractor and air assist and using an external power supply for the low voltage part of this circuit
Be awesome if anyone can send me a diagram of connections
I just need to know where on the cohesion board I can pick up 5v from to feed power to the optocoupler it’s ma in terms of current draw

Did you provide those pictures? We need pictures to understand your setup!

The general concepts are here:

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