Connecting cooling fans to Ramps 1.4 (4 replies)

Hi Everyone,

I have 2 issues i would like to address in this post. 1. Extruder motor cooler fan and 2. PCB cooler fan.
My power supply is a hacked PC power supply, which just have a switch added to control on/off so it is not controlled by software.

1.: I have connected a 40 fan (glued on back side of my extruder motor) to D9 and it works but changes the rpm according to temp., but i am looking for a more simple solution, where the fan is simply cooling all the time running maybe 30% speed. Does anyone have a suggestion how to do this ?

2.: I have connected a 60mm fan directly to the 2 pins next to D2 (i don't know their real number or name), The fan is cooling the PCB fine all the time at what ever speed the fan has and it works, but when print job has finished this fan keeps on running until main power supply switch is flipped. Does anyone have an alternative way to connect this maybe even with the possibility to control speed but most important to be able to stop it together with print job with a command in End G-code ?