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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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