Upload
kiri
View
14
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Can’tTouchThis. KSM Hammer. Jun Wei Chuah Shihong Ng Ming Yang Koh. Status Update. Project Concept: Laptop Anti-theft Device Status Update (implementation): Voltage incompatibility of RFID reader, as well as concerns with limited range of RFID - PowerPoint PPT Presentation
Citation preview
Can’tTouchThisK
SM
Ham
mer
Jun Wei ChuahShihong Ng
Ming Yang Koh
Status Update
Project Concept: Laptop Anti-theft Device Status Update (implementation):
Voltage incompatibility of RFID reader, as well as concerns with limited range of RFID
Using Zigbee protocol to communicate between t-motes
Achieved a satisfied level of sensitivity for device Status Update (testing):
Tested varying degrees of movement Tested range of Zigbee protocol
Experimentation plan Metrics:
Range of T-motes Sets distance at which we arm and
disarm the t-mote Degree of movement of accelerometer
Sets the degree movement to
trigger off alarm
How to measure Conducted 40 trials for each metric
Measured # times in which device is constantly being armed/disarmed for 5 seconds at a particular distance
Measured # times in which alarm is sounded at the various movements
Initial data 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
% of times device was armed vs distance from device
0%
20%
40%
60%
80%
100%
Range of 1.5 feet Range of 16 feet
Distance from Device
% o
f tim
es d
evic
e w
as
arm
ed fo
r 5 s
econ
ds
% of times alarm sounded vs various degrees of movement
0%
20%
40%
60%
80%
100%
Banging of table (False positive)
Moving laptop aw aysteadily
(False negative)
Sudden movement oflaptop
Various movements
% o
f tim
es it
sou
nded
Looking forward
Lessons learnt: Subtleties in tinyOS,
Deluge library prevented buttons from working Using genericComm instead of which hpluart to send
packets Using Tosmsg->strength instead of Tosmsg->lqi
What is next? Receiving Tosmsg packets from PC Setting and testing with different mote IDs Analyze device for more appropriate sensitivities
to movements and range
Questions? Anyone?