I'm trying to figure out how to control my cold end fan from my

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I’m trying to figure out how to control my cold end fan from my ramps board. I’m using Marlin, and it looks like it supports this, but I can’t find any good tutorial on how to wire it up. Has anybody done this?
https://github.com/ErikZalm/Marlin/pull/390

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I put that in marlin quite a while ago…

I wrote a bit at the bottom of this post about it too
http://captain-slow.dk/2012/11/22/attten-858d-smd-rework-station/

And here is something about how to connect a fan to a pin on an arduino http://captain-slow.dk/2011/10/28/sprinter-m42/

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Nice idea

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Thanks @Michael_Andresen ! Turns out all I had to do was wire up my fan to the D9 terminal, and the fan gets controlled by the M106 & M107 commands automatically from my GCode output from Slic3r. I love it when it’s that simple! All the hard work was already figured out. Thanks again!

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Those will only turn the fan on when it is told to do so though, and it might turn on way later than you might want… the stuff I linked to turns it on and off no matter what the code say

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Yeah, most newer releases of firmware will turn it on above a set/actual temp, so no chance of forgetting.