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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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  • You can get 256 nodes on an RS485 bus and it can run long distances. It would start with the serial port on your arduino through some RS485 line drivers.

    http://www.ti.com/lit/an/slla272b/slla272b.pdf

     

    Another suggestion is to use a Neopixel or similar addressable LED string. Lots of arduino software exists for these. You will need a light sensitive relay or circuit to control each door lock.

     

    Another possibility is to use DALI (digital addressable lighting interface)

     

    Or you could go wireless. Enocean has an LEDR module that would work. There are lots of other wireless relays out there.

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  • You can get 256 nodes on an RS485 bus and it can run long distances. It would start with the serial port on your arduino through some RS485 line drivers.

    http://www.ti.com/lit/an/slla272b/slla272b.pdf

     

    Another suggestion is to use a Neopixel or similar addressable LED string. Lots of arduino software exists for these. You will need a light sensitive relay or circuit to control each door lock.

     

    Another possibility is to use DALI (digital addressable lighting interface)

     

    Or you could go wireless. Enocean has an LEDR module that would work. There are lots of other wireless relays out there.

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