Hi, the hotend fan is a 2 wire fan and therefore hard to turn on and off by software. With a 3 wire fan one could just use and analog pin to control the signal wire, is there a know way to include a some sort of software switch with the aux pins? Chees
1.) The hotend fan should be always on. 2.) You don't control the signal wire on a 3-pin fan, you measure it. It is for feeding back RPM data.
In marlin firmware you can enable the hot end fan using the auto-cooling settings in the configuration_adv.h file. You define which pin you want to control it from, the temperature it enables at (50), and the fan speed (255). You'd need a MOSFET circuit and 12v supplied on the power side or a RRD fan extender.
@elmoret 1) I just dont want to walk a across the room all the time to shut the machine of just because the fan is so loud. 2) didnt know that, thanks @mkelly I found a similar thing with a relay linked to m42. ill check it out.
