Household internal wireless sensor network adopts
ZigBee technology and consists of ZigBee coordinator,
the first or second type of ZigBee node, and the first or
second types of function driver module (including the
relay). ZigBee coordinator establishes ZigBee wireless
sensor network on the basis of ZigBee protocol. ZigBee
node is embedded in smart appliances with the function
driver module. ZigBee wireless sensor network can be
bidirectional communication. While collecting operating
parameters of smart appliances and uploading them to
the information processing center, it can also start
function driver module to change operating parameters
of smart appliances according to the control command
given by the information processing center. Considering
the convenience of close operation, traditional key and
infrared control are included in the whole system. The
key is connected to ZigBee node and the node also
replaces the infrared receiver.
Remote control mode adopts SMS and Internet. As
the interface with outside information, GSM module and
Internet interface module are the gateway from
household to outside and they assume diffident protocol
conversion task between household and outside. GSM
module mainly adopts Siemens TC35i. It communicates
with information processing center through USART, and
uses AT commands to send messages and read the
information in SIM card. Internet Interface adopts
ENC28J60.It communicates with the host computer
through TCP/IP protocol and with information
processing center through SPI.
Remote control by SMS is simple to operate, only
send a message such as "open light" to the designated
number, and then the remote light in household will be
on. Or send a message such as "inquire about air
conditioner" to obtain operating parameters such as
on/off and temperature of air conditioner. When
operating parameters of smart appliances are changed
through other method, mobile phone will received an
attention message, which can be close or open through
send a message such as "close/open attention". This
attention method is set to make up for non-real-time
display of remote information for inquiring regularly is a
waste of money. When operating smart appliances
through any other method, if SMS attention is open,
mobile terminal will be informed. Otherwise shied