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Author Topic: RPM Sensor  (Read 6456 times)


  • Case Mod Weenie
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RPM Sensor
« on: January 22, 2008, 03:48:28 PM »

not sure if this makes sense or not, or if there is another way of doing it or what. If you were to build a variable fan adjuster like skylined guide shows you, is there any way to put an rpm sensor on each circuit with a display so that when you adjust the POT it shows you the rpm the fans currently running it so instead of just turning the POT and listening you could physically see on a gauge or display what RPM it's getting adjusted to?


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Re: RPM Sensor
« Reply #1 on: February 07, 2008, 11:39:51 AM »

Adding an RPM sensor to that setup would take a little bit of work, but it would be doable.  Of course, the easiest way would be to plug the RPM line into the motherboard and read it from the BIOS or OS, but if you wanted to do it externally you would need a microcontroller with analog input to make a count of the signal on that line.  Then the microcontroller would have to be connected to a small LCD to output the value.  It's doable, but probably not worth the effort unless you're in need of a new project or already know how to work with microcontrollers, etc.


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Re: RPM Sensor
« Reply #2 on: February 07, 2008, 08:17:14 PM »

You can buy pre-built eletronic tachometers.  I have no idea how expensive they are though.  Basically, they shine a laser and when the laser senses a change in refraction, it makes a count.  Number of counts over a time interval translates to rotational speed.  You could use it for testing, but it'd be difficult to use full time.
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