Digital LCD Fan Tachometer Display

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mjo2125
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Digital LCD Fan Tachometer Display

Post by mjo2125 » Tue Dec 04, 2018 2:46 pm

I am setting up a fermenter chamber with a PWM fan(s) controlled by the BCS. PWM fans have a fourth pin for a tachometer signal. Does anyone know of a digital tach display that can accept the PWM fan output tach signal? Also, I assume that the BCS doesn't accept tach signals and that I would need a stand alone display.

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oakbarn
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Re: Digital LCD Fan Tachometer Display

Post by oakbarn » Fri Dec 07, 2018 7:57 am

I would assume that the Tach wire is just a pulse off a hall effect sensor. You would need a microprocessor. LCD and program to read it. You can go to "https://maker.pro/arduino/tutorial/how- ... th-arduino" to get an idea of using the Hall Effect sensor that is built in to the fan.

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Re: Digital LCD Fan Tachometer Display

Post by mjo2125 » Sat Dec 08, 2018 8:16 am

Thanks. I'm looking at the Arctic F14 PWM case fans. I was hoping the on-board fan processor could send a conditioned signal to a simple panel-mounted LED tach display via wire to the fan TACH harness pin. If i need a microprocessor, it doesn't seem worth the bother just to know the fan RPM

https://www.amazon.com/DIGITEN-Digital- ... B00VKATGZ4

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oakbarn
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Re: Digital LCD Fan Tachometer Display

Post by oakbarn » Sun Dec 09, 2018 1:08 pm

Cheap enough to try. Worse you can do is blow the meter and maybe the fan. :lol:

Along those lines, why are you using PWM fans? Normal Fans under BCS Hysteresis control may do the job you want them to do.

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Re: Digital LCD Fan Tachometer Display

Post by mjo2125 » Mon Dec 10, 2018 6:26 pm

was thinking of allowing the fans to slow roll (min RPM) when not in use at 100%. I think PWM allows that if I'm understanding the concept correctly...

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