Read PWM Fan Tach signal

[karl_k]

As noted in another thread i successfully control a Noctua PWM Fan with the PWM signal on GPIO 46.
Now i was wondering if its possible to read the tachometer signal from the tach line ?
That would be nice to see if the fan is actually turning.

[SunWukong]

@karl_k

Now i was wondering if its possible to read the tachometer signal from the tach line ?

This could help:

Using Raspberry Pi to Control a PWM Fan and Monitor its Speed

I have also looked into PWM fans.

Control of 5V PWM fans, manually, with script and automatically by kernel

The topic of cooling has been addressed here in the forum on various occasions. Some consider fan-assisted cooling to be necessary, others swear by passive cooling and still others find the topic overrated and consider cooling of the VF2 to be unnecessary. Differing opinions on this subject are normal and perfectly fine. Here I would like to address only the first group and go through the possibilities of temperature-regulated PWM control together with you. Those who are concerned about cooling…