| Abstract [eng] |
Recently, various systems for automatically monitoring and controlling the surrounding environment are gaining more popularity. In such systems, randomly distributed wireless autonomous sensor devices report physical parameters of the environment. The ability to collect data from these devices and have it analyzed and delivered to the user quickly enough is usually critical to monitoring and control decisions. Therefore a robust and reliable method for collecting data from multiple devices is needed. However, the sensor devices are made with portability and low power in mind, and they usually do not have the resources to employ complex multiple access methods. This means that the method for collecting data from such devices has to be relatively simple. What’s more, the data collecting node (sink) itself should be simple, portable and low energy, so it could be comfortably used with portable user devices, such as tablet computers. The aim of this thesis is to research the possibility of employing a simple DS-CDMA based protocol and low cost hardware for data collection from multiple sensor devices. A prototype using Microchip dsPIC microcontroller and a low-cost RF module was developed. Experiments focusing on the reliability and timing of data collection while using Gold sequences of increasing length were carried out. |
