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Thread: Need HELP For PROJECT

  1. 7th July 2007 03:46 PM #1
    chrisliew
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    Default Need HELP For PROJECT

    hi all, I am new in town. currently I was doing a project that using pic16f873a micro controller to connect to the computer. but i am facing problem with the connection on the serial cable, so as the program that link to the micro controller. Can any one recommend me a way for the connection on the serial cable by using MAX485 or RS232?
    Thanks for the comment.

    Best regard,
    chris liew
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  2. 7th July 2007 04:22 PM #2
    Nigel Goodwin
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    Check my PIC tutorials, they use a MAX232.
    PIC programmer software, and PIC Tutorials at:
    http://www.winpicprog.co.uk
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  3. 8th July 2007 09:40 AM #3
    chrisliew
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    thanks for the advise on the RS 232 board, but a having problem with the 20MHz crystal as i only has 4MHz crystal. will it be ok as i use 4 MHz crystal with 15pF capacitors?
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  4. 8th July 2007 07:57 PM #4
    Nigel Goodwin
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    Quote Originally Posted by chrisliew
    thanks for the advise on the RS 232 board, but a having problem with the 20MHz crystal as i only has 4MHz crystal. will it be ok as i use 4 MHz crystal with 15pF capacitors?
    Yes, 4MHz is fine, but bear in mind you need to alter any timings.
    PIC programmer software, and PIC Tutorials at:
    http://www.winpicprog.co.uk
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  5. 11th July 2007 07:48 AM #5
    chrisliew
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    Nigel, can i know how much V the capacitors u are using for the tutorial circuit board? i got 2 kind. one is 25V and the other is 50V. will it be ok?
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  6. 11th July 2007 10:49 AM #6
    Nigel Goodwin
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    Quote Originally Posted by chrisliew
    Nigel, can i know how much V the capacitors u are using for the tutorial circuit board? i got 2 kind. one is 25V and the other is 50V. will it be ok?
    Either would be fine - as long as they are higher than the highest voltage used (9V in this case).
    PIC programmer software, and PIC Tutorials at:
    http://www.winpicprog.co.uk
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