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Testing machine errors with MCU based device

Discussion in 'Electronic Basics' started by Igor, May 7, 2013.

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  1. Igor

    Igor Guest

    Hi.

    I want to monitor state of machine ( e.g. pump state, pressure, water
    level etc. ) with my MCU based controller/device.

    Would it be enough to use A/D converter or do i need D/A converter ?
    Based on this i have to select MCU. Most of them have A/D converter but
    i dont know if i need D/A for such task..

    regards!
     
  2. You can't drop an mcu in a water tank to measure the water level :) For the
    functions you need you'll have to find out what sensors you need. Some may
    be easy to find or to build, others may be difficult and expensive. Some
    sensors may look like very good in the labaratory but may be useless in an
    (electrically) noisy environment. The properties of the mcu required depend
    highly on the properties of the sensors. Nevertheless it seems very unlikely
    that you need a DA-converter. Once you know your requirements, you have a
    large number of mcus to make your choice, though I think you'd better look
    for a complete system like PIC-stamp, Arduino or even Raspberry pi.

    petrus bitbyter
     
  3. whit3rd

    whit3rd Guest

    Any microcontroller can implement D/A converter functions with
    pulse width modulation. Whether this is sufficient for your needs,
    depends on ... your needs.
     
  4. Uwe Hercksen

    Uwe Hercksen Guest

    Hello,

    an A/D converter is useful for input of sensor values, a D/A would be
    used for output. As long as you dont need analog output, you dont need D/A.

    Bye
     
  5. Igor

    Igor Guest

    It looks like we seem to have misunderstood.
    Machine that i want to check has all necessary sensors built in.
    My job is to send this analog or digital signal, from those sensors,to
    MCU device controller.

    What Im not sure of is, would it be enough to use just A/D pin input.
    As far as i know most of such machines use some kind of analog control,
    so i dont think i have to use digital output.

    Bottom line, i have to take signal from those sensors and process them.
    If this signal is in analog value, no problem but if the signal is in
    digital format, what can i do then ?

    I would have to detect protocol and encoding using by this sensor etc... ?
     
  6. So you heve the required sensors in place and at your disposal already?
    Well, the next step is to map out their properties. Including place,
    protocol, signal type(s), boudaries and everything you need to know to
    calculate the info you need to present to the mcu. As my crystal ball in
    defective once more I can only speculate about your requirements.

    petrus bitbyter
     
  7. Igor

    Igor Guest

    --------------------
    One example would be to process error data from frequency inverter like
    Eaton. This regulator is used to control 3phase machine and it has
    standard inputs where i can connect my "error logging device".

    I would like to collect those data and save them to MCU.
    What would be the simplest way to do this ?

    http://www.moeller.net/en/products_...cy_inverter/frequency_inverter_mmax/index.jsp
    -------------------
     
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