16 Channel Analog Measurement

Discussion in 'The Projects Forum' started by phoenix3d, Feb 2, 2009.

  1. phoenix3d

    Thread Starter New Member

    Feb 2, 2009
    Hi Guys..

    Throwing this one out there.

    I currently require as much info as possible as to the following conundrum.

    I need to measure 16 channels of Light Intensity (IR Injected into Multimode Plastic Fiber Optic). (IR Tx and IR Phototransistors for Rx)
    Aswell as output this to a PC in a usable form.

    This setup is to measure Makro bend light loss of Fibre Optic Cabling

    Any suggestion on what type of uC to use? PIC, Atmel, etc???
    Code Suggestions etc. ANY Electronics Input Appreciated!!!
    I am sorted on the IR and Fibre Side of things.
    Prefferably USB to PC and a possibility of more than one of these detectors per PC.

    It also needs to be as small a foot print as Physically possible.

    Please Guys I would really appreciate your experience.

    ThankS A Mill

  2. phoenix3d

    Thread Starter New Member

    Feb 2, 2009
    Alberto, Thanks a bunch for the quick reply...:)

    Any suggestions on Coding for the PIC etc...:confused:

    First Time doing this type of Circuit (Crackpot ;-) ):eek:

    Where could I find info on this PIC (Programming stuff not realy my strong suite - But Must learn some time)

    Thanks again.

  3. phoenix3d

    Thread Starter New Member

    Feb 2, 2009
    Hi Alberto...

    Thanks for the Info....

    Been doing a bit of a look up on the PIC18F4550

    Cheeez its a bit of a monster....

    I see it as I think +/-13 ADC inputs....

    If i require a maximum of say 18-19 ADC inputs I could use the 16-1 MUX for Primary sensors and 2-3 from the other available ADC for 2-3 additional Inputs?

    Leaving me +/-another 9 or so available ADC to play with in the Future, correct.

    I am at the moment not looking for and LCD output but Dircet link to a PC via USB.... I just have to hunt around for the iNFO...

    Any comments on FlowCode3 Software for us Rather unProgrammer types?

    Thanks again for your Help, It's really appreciated.

  4. phoenix3d

    Thread Starter New Member

    Feb 2, 2009
    Thanks a Mill for the Help Alberto...

    These PIC's are so versatile, The More I Learn the More I Like them..

  5. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    What sort of budget do you have? B&B Electronics has low cost 16 channel A/D converters that run off the serial buss for well under $100. A fancy DAQ card from National Instruments can be $500-$600.

    The signal conditioning ahead of the multiplexer is the more crucial part.