Pulse Counter 3-pin fan PC

[Jufo]

Hi,

Will this solution work? Use a pulse counter to measure the speed of the PC fan:

[themanfrommoon]

Hello Jufo,

I cannot see the picture you posted?!

Did you get it working?

Thanks and best regards,
Chris

[LisaM]

Hi,

Will this solution work? Use a pulse counter to measure the speed of the PC fan:

5-seconds google search: http://pcbheaven.com/wikipages/How_PC_Fans_Work/
3rd wire contains pulses which can be counted...

[themanfrommoon]

Hello LisaM,

thanks for your answer!
I know for at least 25 years that a PC fan has 3 wires, Vin, GND and a tach output. But this was not the question.

Jufo asked if his solution of connecting the tach signal to the ESP will work.

But I cannot see his picture, he (or she?!) has posted.
And he did not get any answer.
Maybe he found something out by himself or anybody else has helped him?!

So I am interested in this topic, if there is a solution or not.

Thanks and best regards,
Chris

[LisaM]

http://domoticx.com/arduino-ventilator- ... -3-draads/