geoffs wrote:With a dual extruder setup, how does one control the extruder fans?
There are 3 FET outputs on the RAMPS board but these are used for the extruders and the heat bed.
SystemsGuy wrote:Pick an unused pin, define that in pins.h as your fan, and add a MOSFET to control it.
geoffs wrote:SystemsGuy wrote:Pick an unused pin, define that in pins.h as your fan, and add a MOSFET to control it.
I thought there may have been an obvious (simple) answer that I hadn't thought of.
Should be easy given I can plagiarise both the circuit and the software to drive it
geoffs wrote:This might be just what I'm looking for. Not sure if the board/circuit diagram is open source
https://www.dropbox.com/s/7shvnc8niiu8j ... .01.06.jpg
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