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Question:

what kind of device would you like to open an automatic door?

our idea was to put the circuit on a wrist band to operate the door

Answer:

umm i just have a black person do it for me
Is there security? If not, Then you don't need any circuits. If yes, RFID tags are well known, so what is new?
The Force. Claymores. A terawatt laser. Right now, they are using radar, or infrared, to detect a person moving towards the door, to decide to open it. So who do you want to slam into your door, because they do not have the proper RFID chip to trigger an open sequence?

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