@t3p3tony
Ahh I see. Sorry i misunderstood what @jay_s_uk meant by that. Its been a steep learning curve to say the least!
The relay has a 2A max draw to ensure I don't blow anything.
I've tested it and the relay now supplies the neccesary power, thanks for all your help @jay_s_uk @T3P3Tony 
@t3p3tony
Ahh I see. Sorry i misunderstood what @jay_s_uk meant by that. Its been a steep learning curve to say the least!
The relay has a 2A max draw to ensure I don't blow anything.
I've tested it and the relay now supplies the neccesary power, thanks for all your help @jay_s_uk @T3P3Tony
Yeah I have that jumper set on the left two pins for the 5V selection but I'm still reading 0.5V. When I run a test script to switch the output off and on it works, it just isn't supplying 5V?
@jay_s_uk The DUET 2 Ethernet running Duet web control 3.3.0
So does that mean its on by default and then I should switch off? As I can make that work by switching over my NO and NC on the relay. The only problem I have there is that when I run the FAN2 output through my multimeter and switch it off I'm only getting 0.6V as opposed to 5V when its on. Did you say it was possible to set the voltage on the Fan?
Again, sorry to ask such basic questions. I'm trying to learn this as I go without shorting anything out and blowing it up!
if you're not using any fan outputs, set them as 5v and use those
How would I go about doing that? I tried setting Fan 2 as a GPIO with the M950 command; M950 P0 C"fan2" and then plugged one dupont connector onto the left hand pin of Fan 2 and another to ground so I could switch it on and off with the M42 command but nothing happened?
Hi all!
I'm trying to power an external relay switch so that I can supply an external trigger to some hardware I have connected to my CNC setup, however I'm having real trouble getting it going.
I need to draw +5v from the board in order to power the relay, but I really can't see how to set it up. I've spent time scrolling through this forum and looking at blogs on google but I'm drawing a blank on how I supply the two power pins to my relay switch such that I can turn it on and off on command?
Apologies if this is a stupid question, its my first time tinkering with anything like this and I'm doing it for work so really thrown in at the deep end and with time restrictions to work to as well!
So far I've identified the +5V and ground pins from the expansion board, and reading an online blog the PWM fans as a GPIO port but trying to connect them together such that I just have my live and ground going into my two terminals on the relay is confusing me.
Any help or direction to a forum post i may have missed would be very greatfully received
Many thanks
Alex