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Enclosure Fan - How to Hook Up Relay

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Posted · Enclosure Fan - How to Hook Up Relay

I have an Ultimaker 3. I have a relay that can be triggered with 5-12V to control a 120V outlet, into which I've plugged my exhaust fan.


I've got the Enclosure Fan plugin loaded in Cura, and now I'm trying to learn where to pull a low voltage trigger signal from. Any ideas?

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Posted · Enclosure Fan - How to Hook Up Relay

It seems that you need to configure the G-Code to switch a pin in the plugins config:




In Marlin firmware you can use M42 to switch a board pin.


I don’t own a UM3, but I think that the UM2.1.4 board is still used for motion control.

so you can check the circuit for a pin to use here

https://raw.githubusercontent.com/Ultimaker/Ultimaker2/master/1091_Main_board_v2.1.1_(x1)/Main Board V2.1.1.pdf


For example use header Exp3 and Pin PB7. Find the position on the board drawing in the same PDF.


Then look up the arduino pin mapping for the PIN number to use for the M42 command.

The Ultimaker board is essentially a nicer Arduino Mega 2560.




PB7 is pin #13.


So try M42 P13 S255 for on and M42 P13 S0 for off.

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Posted · Enclosure Fan - How to Hook Up Relay


Looks like that board has a few minor changes vs 2.1.4.

Exp3 / PB7 is unchanged.

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