Do we need frequency to voltage converter to connect photo interrupter to NI myDAQ

i need to find the RPM of a motor using photo interrupter and NI myDAQ. Do we need frequency to voltage convertor for it. If yes were can i find the correct circuit for it.

That could work but if you have a digital in on your MyDAQ it would be easier to read the pulses and convert them to frequency in software.  DAQmx read has that functionality built in (Counter > Single Sample > Pulse Frequency)
Using LabVIEW: 7.1.1, 8.5.1 & 2013

Similar Messages

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    Message Edited by noth2691 on 09-25-2007 04:01 PM
    Attachments:
    LM2917N-8.pdf ‏327 KB

    I have not been able to find a model of this anywhere. In my Version 10 there is a part called LTC1966CSM8 that says it it is a RMS to DC converter. The datasheet for this indicates that it is only good for 50hz to 1Khz so I don't know if this would help any depending on the frequency your working with. I don't even know if your version has this chip or not. You can look to see if you have it and whether or not it would be suitable for your apllication. You will find it in the Database under ANALOG>OPAMP if you have it.
    Other than this, you are left with the only option of creating your own and I don't know how that could be accomplished with the information contained in the datasheet. The charge pump would be problematic without more detail about it's internal construction. The rest would be relatively easy with ideal components.
    I am sorry this doesn't help much, but it is all I have for now.
    Have A Nice Day
    Message Edited by lacy on 09-25-2007 06:41 PM
    Kittmaster's Component Database
    http://ni.kittmaster.com
    Have a Nice Day

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