Table 1: Comparison of sensor platforms.

FeatureMica2 [33]WSN [6]Imote2 [34]

Clock speed7.4 MHz0 MHz–8 MHz13 MHz–416 MHz
Flash memory128 kB128 kB32 MB
SRAM256 kB
SDRAM4 kB128 kB32 MB
Radio frequency2.4 GHz900 MHz2.4 GHz
Data rate38.4 kbps57.6 kbps250 kbps
Outdoor range150 m300 m150 m
Radio power31 mW (TX)230 mW (TX)52 mW (TX)
22 mW (RX)145 mW (RX)59 mW (RX)