Voltimeter?


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  1. #1
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    Default Voltimeter?

    Hi

    I have a signal between 0~24V and I want to convert it to digital (8 bits is enough) and send it to a PC (RS-232).This is all I need, I can use a Max232 or Max233 for the serial data, but any suggestion about a PIC model to make the conversion?

    Regards

  2. #2
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    Literally most any PIC you pick will do. I search MChip's site for the flash units with 2 or more A2D's (the lowest count is will search for) and got back 166 of 186 hits. Even the lowly PIC10F220 (the tiny 6 pin SOT device) has flash memory and A2D

    Microchip search page:
    http://www.microchip.com/ParamChartS...g=en&pageId=74

    Just keep in mind the A2D converted can only range up to it's reference voltage (which is fixed to be VCC in the 10F220), so you'll need a voltage divider to being your 24V down to the range the PIC can read. That divider is also a nice place to add some overvoltage protection too.

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    Smile

    Hi
    take a look at the links i have pasted. they are great articles on how to use the ADC on small 8 pin pics.

    http://www.rentron.com/four-channel-ad.htm
    http://www.rentron.com/PIC12C67XAD.htm
    http://www.rentron.com/PIC12C67X.htm
    http://www.rentron.com/PICX2.htm

    Micorhip makes the 12f675 which is the pic of choice if you want flash memory.

    good luck

    sam

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    Wink keep to Jules what's Caesar's ...

    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************

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