Radio: The node is connected to the WSN via the ETRX3 module,DD3. It is the 2.4 GHz ISM band ZigBee/802.15.4 transceiver which has +3 dBm output power, −98 dBm sensitivity and small current consumption in sleep mode. The ZigBee transceiver is operated by AT commands which are transmitted through UART interface of the ADuC836 at baud rate 19,200 bps.