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control 250 doors with arduino

abolfazlnejatian

Hey Everyone

 

I have a question about my project and I’ll really appreciate any help you can give,

I’m going to programming a software in order to automatically open up 250 doors with FINGERPRINT SCANNER, I mean I’ve 250 members in a gym and I want to recognize any of them by their fingerprint and then open their related door wardrobe.

So the question is, I don’t know after verifying any individual person and understanding the related door, how can I command to the doors to open?

Let me clarify the sentence, Arduino have 16 pins as output and I’ve 250 doors to control.

I know it’s completely ridiculous to dedicate 250 pins to 250 doors but I don’t know how to overcome to this problem and reduce the pins number!

 

Thank you in advance for your attention to this matter.

 

Many thanks

Abolfazl

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  • Silly thought:

     

    how reliable is a fingerprint recognition system for people who just played basketball, have been swimming or just took a shower after sport?

     

    these activities, all common in a gym, alter your fingerprints for a while.

    Look at your prints when you leave a swimming pool.

  • in reply to Jan Cumps

    The fingerprint readers on EPoS tills in bars used to give endless problems for this reason.

     

    Also at a security seminar a while back I recall that they don't work well with people who handle rough surfaces like bricklayers or chemicals like cleaning solvents. Police apparently often have to use petroleum jelly in order to puff up the fingerprint when fingerprinting in such cases.

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  • in reply to Jan Cumps

    The fingerprint readers on EPoS tills in bars used to give endless problems for this reason.

     

    Also at a security seminar a while back I recall that they don't work well with people who handle rough surfaces like bricklayers or chemicals like cleaning solvents. Police apparently often have to use petroleum jelly in order to puff up the fingerprint when fingerprinting in such cases.

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