Door lock via Bluetooth
Team members
Martin Kornfeld
Jürgen Ichovski
Tutors
Dipl.-Ing. Dr.techn. Nikolaus Baumgartinger
Dipl.-Ing. (FH) Martin Eisner
conceptual formulation
The main target of this project was to equip a conventional mobile phone with an
additional special function. Even tough a mobile phone already has enough
functions a new application to improve the efficiency of a mobile phone should be
added. So the task was to develop a software which allows the user to open
doors by pressing a button on the mobile phone.
To open a convential door a microcontroller must be added in the door to process
the data from the mobile phone. As a next step the microcontroller is able to
control a little engine to open or close the door. Both components are installed
inside the door and so no additional modifications are necessary. The data
transmission is carried out via a Bluetooth connection. A special Bluetooth modul
is able to convert the wireless data into a RS232 datastream. As a result a main
socket has to be produced, which connects microcontroller, Bluetooth modul and
the mechanics.
As a security aspect it should be also possible to lock the door using an old fashioned
key.
details on execution
To realize these steps some modifications were necessary to work with the instructions of the user.
First step was to add actuating components inside the lock which let the door bar open or close. As a result it is possible
to lock the door with a mobile phone and as mentioned before mechanically with a key. Second step was to combine all actuating components on a mainboard. It was necessary to connect microcontroller, bluetooth-modul
and engine which opens or closes the door. The bluetooth modul is essentially to receive the instruction of the user and to send
it via RS232 to the microcontroller. The microcontroller is able to work on these instrctions and to control the engine inside
the door. Furthermore a software for a mobile phone was developed to give the user a possibility to send or reveive messages
over a simulated seriell port profile via bluetooth. The software should be as simply and user-friendly as possible.
To station the engine with an optimum on performance inside the lock some mechanic modifications where necessary. Some
parts where replaced and some gears where added to implement the opening and closing feature.
As a last step the firmware and software where modified to carry out an automatically door opening function. Cause of the
bluetooth range of approximatelly ten meters the bluetooth modul is able to recognize the mobile phone and to open the
door without an action from the user. If the user is out of range the door closes automatically.
HTL Wien 3 Rennweg, Mai 2007