[nRF51822] Access control system

[Jeffery]

Hi We know most of access contol for entrance was implmented by RFID. Is it feasible to design it by BT4.0? My idea is as below. Thanks for your comment.

1. There is a BTLE device (nRF51822) installed in the office entrance. Its role is to recieve BTLE host
   identification packet and judge if the employee have access to enter the office.
2. The BTLE host would be a smart phone. Each employee was registered in advanced and got a identificatioon number.
3. BTLE device (nRF51822) also detects RSSI to judge the employee is entering or exiting the office.

[Ole Morten]

Something like this should be possible, but I don't think it would be trivial, and it isn't an application that I'd say BLE is intended for. An app running on a smart phone, trying to connect to a Peripheral may scan with a very low duty cycle, in which case it might take quite a while for it to discover such a door lock.You will also have to come up with some bonding/security scheme that is secure enough for your requirements.