EECS194
Lab1: TelosB
ab e os Motes
otes
Ami Domadia
Wei Man Lin
Wei‐Man Lin
Susan Moon
Uyen Nguyen Huynh
Yoav Peeri
Trung Tran
Introduction to Telos Mote
Introduction to Telos
• Sensor
Sensor network nodes . Embedded Sensors. network nodes Embedded Sensors
Data logger. • TinyOS, UCB, Arch Rock company
TinyOS UCB Arch Rock company
• CC2420, 801.15.4 standard • IPv6 , LoWPAN
• Previous generation: MICA ? g
• Next generation : EPIC
Connectivity Testing 1
Connectivity Testing 1 Signal
g
Strength
g vs. Distance
0
0
100
200
300
400
500
600
Sign
nal Strength (dBm
m)
-10
20
-20
-30
111 Cory
-40
ESD Bag
-50
Corry Hall 2
-60
-70
-80
-90
Distance (cm)
Connectivity Testing 2
Connectivity Testing 2
Closed Up Testing
0
‐1
0
0.5
1
1.5
2
Signal Stren
ngth (dBm)
‐2
‐3
‐4
‐5
5
‐6
‐7
‐8
8
‐9
‐10
Distance (cm)
2.5
3
3.5
Connectivity Testing Conclusions
Connectivity Testing Conclusions
• Limitation
Limitation on signal strength: on signal strength: ‐90dBm
90dBm
• Interference sources: materials obstacles signal from other
materials, obstacles, signal from other sources. • Environment variable.
E i
i bl
• Human ??!!!
• Is it really rssi = k/rn ?
Hop Testing
Hop Testing
No Connection