Slide 1 - Noppa - Etusivu

							Controlling Devices using Bluetooth
             technology

                 Adnan Ali




            HELSINKI UNIVERSITY OF
                TECHNOLOGY
                    Problem Statement

   Currently, most access methods require physical contact to a
    device: swipe-card / push button /magnetic keys
   a short-range wireless technolgy can be used instead: Bluetooth
   access control from a distance
   less to carry, same device used for voice communication: mobile




                        HELSINKI UNIVERSITY OF
                            TECHNOLOGY
       why Bluetooth for implementation???

                           low cost
                      non-LOS nature
                    easily programmable
                unlicensed frequency band
           IrDA vs Bluetooth: 0-1m vs 10-100 m
       ZigBee vs Bluetooth: TTGB 3.1 day vs 2.2 hrs
soon Bluetooth will be embedded into almost every device



                    HELSINKI UNIVERSITY OF
                        TECHNOLOGY
             Bluetooth Overview
Frequency Band Range: 2.400 - 2.4835 GHz
Lower Guard Band: 2 MHz
Upper Guard Band: 3.5 MHz

Power Classes: A, B, and C
How to determine power class ???

A protocol similar to HTTP, FTP ???
Most popular among the short-range wireless technologies




                    HELSINKI UNIVERSITY OF
                        TECHNOLOGY
                 Bluetooth Protocol Stack
•   Physical Layer (PHY)
•   Medium Access Control (MAC)
•   Host Controller Interface (HCI)
•   Logical Link Control and Adaptation Protocol (L2CAP)
•   Service Discovery Protocol (SDP)
•   RFCOMM
•   Telephony Control Protocol Specification (TCS-BIN)
•   Wireless Access Protocol (WAP)
•   Object Exchange (OBEX)
•   Bluetooth Network Encapsulation Protocol (BNEP)
•   Human Interface Device Protocol (HID)


                      HELSINKI UNIVERSITY OF
                          TECHNOLOGY
Bluetooth Profiles and their interdependencies
                                 Generic Access
      Service Discovery                                    Cordless Phone
      Application Profile       PAN Profile                Profile
      Hard Copy Cable                                      Intercom Profile
                                HID Profile
      Replacement Profile


              Serial Port                 Generic Object Exchange

       Dial-Up Networking Profile         File Transfer Profile

       FAX Profile                        Object Push Profile

       Headset Profile                    Synchronization Profile

       LAN Access Profile                 Basic Imaging Profile

       Hands Free Profile                 Basic Printing Profile




                            HELSINKI UNIVERSITY OF
                                TECHNOLOGY
Advantages and Disadvantages of Bluetooth

Advantages                          Disadvantages
wireless                            low data rate
simple connectivity                 security
low cost
low interface
low energy consumption
voice & data both


Bluetooth Low Energy***


                   HELSINKI UNIVERSITY OF
                       TECHNOLOGY
            System Components

   Bluetooth Node
       Serial Board
       Serial programmable chip/card
       Bluetooth Intelligent Serial Module (BISM-II)

   Mobile Phone
      JSR-82 compatible
     (JAVA Specification Requests)



                 HELSINKI UNIVERSITY OF
                     TECHNOLOGY
HELSINKI UNIVERSITY OF
    TECHNOLOGY
Requirements for communication (I)

                Bluetooth Node:
 should be in running state powered by 12V DC
 installed on a place easily accessible by user
(max distance of 10 meters)
and
 BTNode application for communication




              HELSINKI UNIVERSITY OF
                  TECHNOLOGY
Requirements for communication (II)

                Mobile Phone:
 compatibility with JAVA Bluetooth (JSR-82)

 Embedded Bluetooth status ON/OFF

 distance from Node (max 10 meters)

and
 MIDP application for communication




              HELSINKI UNIVERSITY OF
                  TECHNOLOGY
         Communication Procedure (I)

1.   turn the Bluetooth of the mobile phone ON
2.   run the MIDP application
3.   when prompt for, allow the MIDP application to read and
     write user data
4.   select the BISM-II (mounted on BT Node) module with its
     given friendly name and send a connection command via
     phone just by selecting the “connect” option
5.   after a successful connection, an action command option is
     received, “unlock the door”, select it to close the relay of
     BT Node.

                    HELSINKI UNIVERSITY OF
                        TECHNOLOGY
Communication Procedure (II)




       HELSINKI UNIVERSITY OF
           TECHNOLOGY
             Implementation (I)

   Programming the Serial Card
       C language
       AT Commands interface (AT commands set in pdf)

   Programming the Mobile Phone
       JAVA 2 Micro Edition, MIDP 2.0




                HELSINKI UNIVERSITY OF
                    TECHNOLOGY
                   Implementation (II)

                                         app
                      (files responsible for initiating the
                      application)



                            bt                               core
      (files responsible for                      (files having core functions,
      configurations of BISM-II)                  e.g reading port data)



                    target                                      protocol
(files configuring port type,                   (files making BISM-II
baudrate, data rate, data bits,etc)             communicate with serial board)




                          HELSINKI UNIVERSITY OF
                              TECHNOLOGY
           Implementation (III)

               MIDP Application
 Device discovery

 cert send

 service discovery protocol implemented




              HELSINKI UNIVERSITY OF
                  TECHNOLOGY
   Implementation (IV)

source code snippets       C file(s)




      HELSINKI UNIVERSITY OF
          TECHNOLOGY
               Software Testing (I)


3 types of SW testing performed during implementation
     unit testing (automated)

     integration testing (automated)

     system testing (automated + manual)

            regression testing: not needed




                  HELSINKI UNIVERSITY OF
                      TECHNOLOGY
                 Software Testing (II)

                            Identify test conditions (determine
Identify                    ’what’ can be tested) and prioritize

                                   Design test cases (determine ‘how’ the
       Design                      ’what’ is to be tested)

                                          Build test cases (implement
                Build                     scripts, data, etc.)
                                                    Execute test cases
                        Execute
                                                    Compare test case
                                                    outcomes to expected
                                  Compare           outcomes




                        HELSINKI UNIVERSITY OF
                            TECHNOLOGY
Test case    Description             input          Expected   result
                                                    outcome
             tests the condition     data           Error      passed
Test CR/LF
             when CR and/or          without
                                     CR and/or
             LF is not received
                                     LF at the
                                     end




                           HELSINKI UNIVERSITY OF
                               TECHNOLOGY
Tools used for SW design and development

   Eclipse
   Microchip MPLAB ICD 2

   Sun Wireless Toolkit




               HELSINKI UNIVERSITY OF
                   TECHNOLOGY
                        System’s Areas of Use

   wherever relays are used
       lights control via Bluetooth
       door opening closing via Bluetooth
       car’s lock
       morning coffee maker
       etc.




                              HELSINKI UNIVERSITY OF
                                  TECHNOLOGY
               Future Work

 LAN interface to control over internet
(might be useful if a capable MIDP device is stolen)

 more than one devices controlled by a
single MIDP application simultaneously




               HELSINKI UNIVERSITY OF
                   TECHNOLOGY