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 theADuC836 at baud rate 19,200 bps.