In our days many data acquisition and control network systems designed for home applications are available. These systems are usually use wireless sensors and actuators. The big benefit of this concept is the easy installation. However, because of the power source of these wireless modules are batteries or sometimes accumulators, the cost of replacing or charging them can be significant. This is the main reason why these systems are not used more widely.
In my MSc thesis I am going to introduce the steps of designing a data acquisition and control network system which combines the advantages of the wired and wireless networks. The sensor and actuator modules will use a wired bus connection with the benefit of batteryless design. These buses will be
subnetworks of a wireless system to guarantee the easy and flexible installation of the modules. To ensure the secure and reliable data transmission to the place of evaluation a third hierarchic level is responsible for connecting the whole system to a high-level data network.
I begin my thesis with briefly introducing the field of the sensor networks, including the basis and the common applications. After summarizing the expectations of my thesis work, I analyze the most commonly used wired and wireless sensor protocols to choose the most suitable ones for implementing this three level hierarchic system.
In the second part of my thesis I am going to introduce the hardware and software development steps of a data acquisition system which is capable of monitoring different parameters of a home environment. Two kind of Slave nodes will be introduced: a temperature- and humidity sensor and a motion detector based on a PIR sensor. These devices are operating in the low hierarchic level of the system. The Master nodes are acting as gateways between this low and the middle hierarchic levels. In my thesis I am going to implement a Master with a ZigBee based wireless communication interface and compact design which requires a direct power socket connection. Finally, I am going to introduce the development steps of the Coordinator node of the system. The tasks of this device are to collect the information from the different sensors and to display them on a web based graphical human interface.