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Wireless Sensor Mote

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Ultra low-power wireless module
for sensor networks, monitoring app, rapid prototyping
Key Features
2.4GHz 802.15.4 radio, 250kps
8MHz processor, 10k RAM, 48k Flash
Fast wakeup (6s)
1MB external flash (16 segments, each 64kB)
Ultra low current consumption
TinyOS support



Some Research Area in WSN


Wireless Communication
Localization
Calibration
Time Synchronization
Routing (Data-Centric Routing)
Deployment, Lifetime optimization
Signal Processing - compression, detection
Storage (Data-Centric Storage)
Mobility



Wireless Communication


Three regions*:
Connected
Disconnected
Transitional
Transitional region :
Asymmetric links
High variance space/time
Large extent
Significant impact on some routing  protocols



Routing


In real life, sensors are unable to detect or measure the event’s effect  below certain threshold. So, diffusion curve has finite tail - Lack of sensitivity of sensor device(s) - Creates flat information region
Erroneous reading of the malfunctioning sensors  - Due to calibration error or obstacle - Cause local maxima or minima
Environmental noise