The radio communication of crossbow motes are described as follows.
(visit http://www.xbow.com/Technology/RadioCommunication.aspx)
"The radio technology used in Crossbow’s wireless modules supports domestic and international frequency bands in the 433 MHz, 868-915 MHz, and 2.4 GHz bands. Multiple channels are available in each band under software control, resulting in a flexible solution for customer applications. Two modulation formats are available, two-tone Frequency-Shift-Keyed (FSK) at 433 and 868-915 MHz, and direct sequence spread spectrum (DSSS) at 2.4 GHz supporting the 802.15.4/ZigBee standard. All radios are bidirectional (half-duplex), and support a range of 30 to 1000 feet (10 to 100 meters) using XMesh with low-power protocol and battery-life time of 5 plus years in commercial applications. Transmit power levels are software controlled to enable end users to comply with local government regulations for frequency transmission.
The processor has full control of radio features, and can control parameters such as transmit/receive mode switching, channel selection, output power, and radio standby mode. Data packets routed through the radio are error correction encoded, with the ability to listen to the channel via RSSI measurement to determine if the channel is clear to send data. Depending on choice of radio and configuration, data rates of 19.2kbps to 240kbps are available. Both the radio and processor support deep sleep modes for maximum power savings. The motes are designed to support battery operation from 2.4V to 3.6V, with an integral battery voltage monitor."
sensing devises are the sensor boards which we can plug in to the mote. We can plug several sensor boards to single mote and it enables multiple sensing capability to the sensor. Sensor board is consisted with one or more sensors. Humidity, temperature, light, acoustic and many more sensors are available.
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