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Discussion in 'General Electronics Discussion' started by mechanicalquery, Jan 11, 2014.

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  1. mechanicalquery


    Jan 11, 2014
    This may be straightforward, but I want a tachometer that I would use to measure the speed of a rotating shaft and have it read it out on my computer. Are these things pretty standard or would I have to build one? Most of the tachometers I've found have their own digital LCD display.
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    There are several ways of measurig the rotational speed of a shaft:
    - magnet and hall sensor
    - optoelectronically (e.g. reflex light barrier)
    - electromechanically (tachometer generator)
    - ultrasound

    Each type of sensor will need additional signal conditioning to generate a signal that can be read by a computerI take it you don't want to count pulses and compute the rpm from that, you will want to read the rpm as a digital number using a computer's communication port (USB, serial...)?

    You want to buy a unit or are you willing to build one yourself?.
  3. jcurrie


    Feb 22, 2011
    the mine i worked at used the magnet and hall effect the readings here sent to a interface by land line then displayed on a computer screen.
  4. Arouse1973

    Arouse1973 Adam

    Dec 18, 2013
    Reflex light barrier might be a limitation, they might not be able to have everything in one package. I would go for what we call a break beam. Or as mentioned hall effect or personal favourite reed switch. Simple.
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