Purchase or build a biometric input device.Interface it to the microcontroller.Interface the microcontroller to an electrically-controllable door lock. Write a program for the controller to read the device's input and compare it to the stored "correct" value, releasing the lock when they match. Allow for reasonable amounts of measurement error, with the understanding that the more forgiving you are, the less secure you are -- but also understanding that no device provides perfectly repeatable results.
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how can i buid the biometric input device??? i really need to know because i am doing a project on that and i need to build one.
Which biometrics are you interested in, and how much money do you have? L
You do not worry about money, how much money you need to answer the question?