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Some time ago I deployed a RFID access system that over time needed a way to arbitrarily open the door from within the office. The way that made most sense to me to handle that was to make a button attached to an ESP8266 module and make a secure REST call to the server handling the door access thus opening the door.
The schematic is pretty straight forward. ESP07 with it's assortment of components, a button for a person to press, barrell jack for 5V and a couple indicator LEDs.
The next page shows varios stages of making the PCB:
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