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P1254413710vaghH
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A laptop owner today is unable to leave his/her laptop unattended for a short ... Used hysteresis to buffer the change in arm/disarm states. Objective: ... – PowerPoint PPT presentation
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Title: P1254413710vaghH
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http//www.ece.cmu.edu/ece549/spring07/team8/
s
Priya Narasimhan Junwei Chuah Shihong Ng Mingyang
Koh
C A N T T O U C H T H I S
Architecture
Motivation
- Motion Detection
- Accelerometer communicates motion to Tmote
- Dual activation/deactivation of state
- Armed by user/ sensing distance between user and
device - Disarmed by password / sensing distance between
user and device - Serial communication b/w laptop and device
- TOSMsg packet sent from device to laptop
- Individual bytes sent from laptop to device
- Zigbee Protocol
- Used hysteresis to buffer the change in
arm/disarm states
- A laptop owner today is unable to leave his/her
laptop unattended for a short period of time
without risk of the laptop being stolen. - With our system, an alarm will sound if the
laptop is being handled by unauthorized personnel.
- Objective
- Develop a cost effective anti-theft device for
every laptop user. - Eventually embedded inside every laptop.
Development Environment
- Hardware
- Moteiv Tmote Sky
- Spark Fun Electronics Triple Axis Accelerometer
Breakout ADXL330 - Software
- Java
- TinyOS
Results
- Almost every sudden movement would cause alarm to
ring - Thief can steal laptop by moving it away slowly
- Banging of lab table does not cause alarm to
sound off most of the times - Device will be in disarm mode constantly if user
within 1.5 feet - Device will likely be in arm mode constantly if
user is at 16 feet from device
- Protocols
- USB
- Zigbee
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