Very interesting discussion, and how it ‘evolved’ …
With the NFC’s and other solutions, before you know it, each chicken would have to carry its own NFC-enabled photo-ID to open/close the door 
it really isn’t all that complex. They make RFID leg bands for poultry. Making and setting up readers, isn’t all that hard if you are already into this stuff. Even if you are not but really wanna do it, you can.
Hardest part is making the antenna. I plan on making some to read what hen is laying, time, weight, and a few other bits of info. Plan on making the antennas in cased in clear resin. Not necessary but still gonna do it.
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