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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

Parents

  • 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

    Success depends on the person, the application (how secure does the access need to be), the ambient temperature, humidity and a host of other factors. Some fingerprints can be very hard to read with standard readers because they don't look like normal fingerprints, but they are still pretty unique. Pineapple pickers have notoriously messed up fingerprints. Some fingerprints are almost bald - essentially non-existent. If the application is in a controlled environment (not trying to lift latent prints) it can be made much more secure, but typical systems don't go as far as they could. For example the pattern of pores in a fingerprint is also very unique and not hard to read if you use adequate technology. Of course you need to account for pores expanding with heat.

    On an interesting tangential topic I wrote an article on what different fingerprint styles tell us about ourselves and our mothers:

    Intimate Science

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  • in reply to Jan Cumps

    Success depends on the person, the application (how secure does the access need to be), the ambient temperature, humidity and a host of other factors. Some fingerprints can be very hard to read with standard readers because they don't look like normal fingerprints, but they are still pretty unique. Pineapple pickers have notoriously messed up fingerprints. Some fingerprints are almost bald - essentially non-existent. If the application is in a controlled environment (not trying to lift latent prints) it can be made much more secure, but typical systems don't go as far as they could. For example the pattern of pores in a fingerprint is also very unique and not hard to read if you use adequate technology. Of course you need to account for pores expanding with heat.

    On an interesting tangential topic I wrote an article on what different fingerprint styles tell us about ourselves and our mothers:

    Intimate Science

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