JSM Hammer’s

Can’tTouchThisMid-Semester Demo

http://www.ece.cmu.edu/~ece549/spring07/team8/

Re-cap : Project Concept

•Concept: •This project will act as deterrence against laptop thefts, providing the owner a greater degree of security.•The prototype integrates off-the-shelf embedded components, such as motion-sensing accelerometer, buzzer, RFID reader and tags for passive activation of the device and the Tmote Sensor.

•Motivation:•A laptop owner today is unable to leave his/her laptop unattended without risk of the laptop being stolen.•Using our prototype system, an alarm will be activated if the laptop is being handled by unauthorized personnel.

System Architecture

Status Update

•Accomplished: •Telos Motes can now send and receive messages to Java application•Accelerometer can send readings to Telos mote•Arm and disarm state accomplished•Buzzer will sound when unauthorized motion detected

•Risk mitigated•R1. Compatibility between RFID reader and Telos Motes•R2. Compatibility between voltage regulator, RFID reader and Telos Motes•R3. Compatibility of rechargeable battery with rechargeable mechanism on Telos Motes•R4. Real-world performance of RFID reader with respect to range•R5. Constraints with respect to the ports available on Telos Motes•R6. Difficulty in finding suitable algorithms differentiating significant and non-significant movements•R7. Usage under different laptop operating environments

Parts and Pictures

Breadboard

Accelerometer

Buzzer

Rechargeable battery

Telos Mote

TI RFID reader

TI RFID cards

Demo Scenario

•Connection phase•Arming•Detect movement and sound alarm•Disarm•Detect movement and no alarm

Next Steps

•Have RFID reader to work with Telos mote (SW & HW). •Password setup and password screen pop-up.•Integrate the components into a more compact device

Software Architecture

Lessons Learnt

•Sort out workspace properly and backup frequently.•De-soldering can be pain.•For accelerometer readings, we can use the Message Interface Generator (MIG) to generates a Java class representing a TOS message. This allows easier manipulation of the readings. •Communicating to Telos mote through UART can be confusing: format of message to send, or simply send single bytes, and initially it prints out in ASCII. •When encountering an extended period of doubt, its time to look for TA(s).

Tentative Schedule

Week 7 Mid-Sem demo

(stillCanTouchThis)

Week 8 Spring Break

(notTouchingThis)

Week 9 Work on RFID and voltage regulator

(startToTouchThisAgain)

Week 10 Settle all hardware issues

Week 11 Software (password configuration)

Vigorous testing

Week 12 Tie up loose ends &

prevent trivial attacks on system

(finishTouchingThis)

Week 13 Final Demo(REALLYcan’tTouchThis)

Q & A