Need help in constructing PIC16F84A circuit on my project

Discussion in 'The Projects Forum' started by saathis, Dec 13, 2010.

  1. saathis

    Thread Starter New Member

    Dec 13, 2010
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    Dear friends,

    Here im saathis from Malaysia, regards my final year project i have some doubt about the PIC16F84A microcontroller. Currently im studying final year in computer science which majoring in networking. So, i have select E-Smart Door Access System as my final year project title. This project based to image processing which use fingerprint reader to identify the user to acess the door. So, here i need implement PIC16F84A circuit to send the signal to the magnetic lock via relay after fingerprint matching process. So now my doubt is how i can implement PIC16F84A circuit and what are the equipments need in order to build PIC16F84A circuit board. Any one can show or answer my questions. Thank you!!!!
     
  2. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
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    What are you going to use as a fingerprint sensor?
     
  3. tyblu

    Member

    Nov 29, 2010
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    You may want to buy a development kit. You'll want the PICkit programmer, regardless. It comes in this kit, though it is the old version 2 -- PICkit 3 is now required. Maybe contact them and ask if the PICkit 3 is now included in that kit. Anyway, it comes with the kernel circuit and the chip you mentioned.

    http://www.microchipdirect.com/ProductSearch.aspx?Keywords=DM163035

    This is another board, but looks more expensive:
    http://www.microchip.com/stellent/i...06&dDocName=en545425&redirects=F1EvalPlatform

    This is the PICkit 3:
    http://www.microchipdirect.com/ProductSearch.aspx?Keywords=PG164130

    If you can change families to the PIC18, you can get the PICkit 3 and PIC18F45K20:
    http://www.microchipdirect.com/ProductSearch.aspx?keywords=DV164131
     
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  4. SgtWookie

    Expert

    Jul 17, 2007
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    The PIC16F84A is an 8-bit processor, has only 1024 words of program memory, 68 bytes of data RAM, and 64 bytes of data EEProm.

    I don't know how you think that you'll be able to process a fingerprint image with such a minuscule amount of computing power.
     
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  5. retched

    AAC Fanatic!

    Dec 5, 2009
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    Maybe he is using a barbie dolls finger!?
     
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  6. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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    1st, you may want to switch to a more modern PIC, such as a 16F88 or 16F627, they provide everything the 16F84 does, and more, such as internal clock, more RAM, etc. They are also cheaper than the 16F84 too since the old chip is being phased out slowly.

    What is the output of the fingerprint reader? Unless you acquire a "fingerprint module", the project will be nearly impossible with a microcontroller alone.
     
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  7. nerdegutta

    Moderator

    Dec 15, 2009
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    Maybe he has the finger scanner connected to a computer, doing all the processing, and just need the PIC to switch the relay...? Wouldn't the PIC handle that?

    Would be awful nice to have a schematic, of some sort of layout...
     
    Last edited: Dec 14, 2010
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  8. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
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    I'm sure the OP wants that too. ;)
     
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  9. saathis

    Thread Starter New Member

    Dec 13, 2010
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    Thank you all of you senior members to reply my post. Actually im doing project based to image processing. The matching process will be done manually by admin from server. PIC16F84A where used to send the matching signal to the magnetic via relay. That is it......
     
  10. nerdegutta

    Moderator

    Dec 15, 2009
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    Manually?

    Like, by humans?

    One man/woman sitting and comparing images, and when match is found, the person is pushing a button, opening a door...?


    I think you need to explain a little more, in detail...
     
  11. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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    When is this due?

    If a PC is involved, and the only output is a lock, a few parts and a parallel port plugin on the PC would substitute for the PIC.
     
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