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The door is no longer using the DTR to interface the lock. It now has an ATTiny85 that is controlling the lock's solenoid. In addition to that, a NeoPixel ring was added to signify the presense of the RFID reader and perform a visual effect when a card is accepted. And if that wasn't enough, an EMIC2 module has been commissioned to greet the visitors.
You can also find the 3D printed base for the loudspeaker and case for the reader and ring, at thingiverse.com.