As I off-topicly mentioned in Gummix' thread (Temperature controlled PWM Fan), I'm desperately trying to get a readout of a fan's RPM-Signal. Everything I got from the rpi-GPIO-Node could not be interpreted in any way to make sense - at least not to me. I'm not even sure if the processing of the readout in Node-RED is fast enough to accomplish that, the Rasperry Pi 3 should be. Has anyone faced this topic? Any hints?
By the way... I'm using the Arctic F14 PWM fan.