Development of cdma wireless sensor network
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Date
2018-06
Authors
Ooi, Teik Chen
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Abstract
Wireless sensor network (WSN) is a technology which had been proposed as an
approach to monitor environment condition, health condition, public safety and many
other applications. In this project WSN will be used to detect fire at different areas. The
problem statement of this project is the issue of limited channel bandwidth of WSN for
wider detection area. The objectives of this project are to develop an efficient WSN for
fire detection system using the code division multiple access (CDMA) wireless
transmission, and to design a WSN which able to collect and to monitor the required data
for fire detection. CDMA Walsh code was used to spread the collected data signal over
the limited channel bandwidth to differentiate the signal among the nodes. In this project,
sensor nodes equipped with temperature sensors and CO gas sensors to collect data from
the environment. CSMA/CA MAC protocol was implemented to handle the multiple
transmissions from the sensor nodes. A mobile phone app was devised to allow the user
to monitor the sensors readings uploaded to IoT platform of the area located with the
sensor node. The maximum distance of data transmission is 115 m. The temperature
sensor readings and the digital thermometer readings shows average percentage error of
1.08%. The CO gas sensor shows the reading above 10 when burning smoke is detected.
A smartphone application had been devised to allow user to monitor the fire parameter
for fire prevention. The WSN had been developed successfully with CDMA transmission
method and it able to collect and to monitor data for fire detection. In future work, an
antenna with higher gain can be used to improve the distance of data transmission. More
sensors can increase the accuracy of the fire detection. A special CDMA antenna which
able to receive multiple signals simultaneously can be designed to handle the multiple
access from more sensor nodes.