1. Lecture 22: Wireless Sensor Security
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2. Sensor Nodes basic part of a sensor network components
low-power processor
limited memory
array of sensors (magnetometer, accelerometer, radar, infrared sensor, microphone, etc.)
radio transmitter
power source (battery)
main constraint – low power
other constraints – memory, slow processor
other characteristics – not mobile, programmable, ad hoc netowork

3. Prototype Networked Sensor (Mote)
4Mhz, 8bit MCU
512 bytes RAM, 8K ROM
900Mhz Radio
10-30 ft. range
light and other sensors
ADC
LED outputs
serial Port

4. Other Sensor Exampls LWIM III UCLA, 1996 Geophone, RFM
radio, PIC, star
network
AWAIRS I
UCLA/RSC 1998
Geophone, DS/SS
Radio, strongARM,
Multi-hop networks
Sensor Mote
UCB, 2000
RFM radio,
Atmel
Medusa, MK-2
UCLA NESL
2002
Over the past seven years, nodes have gone both in the directions of smaller size and increased capabilities. Some of these are now to the point that they can be conveniently programmed by groups other than the developers, and thus may be used in support of scientific experiments. All the nodes illustrated are descendents in various senses of the UCLA LWIM project.
Predecessors in
DARPA Packet Radio program
USC-ISI Distributed Sensor Network Project (DSN)

5. Embedded Networked Sensing Potential
Micro-sensors, on-board processing, wireless interfaces feasible at very small scale--can monitor phenomena “up close”
Enables spatially and temporally dense environmental monitoring
Embedded Networked Sensing will reveal previously unobservable phenomena
Ecosystems, Biocomplexity
Contaminant Transport
Marine Microorganisms
Seismic Structure Response