Control car using zigbee

Abstract

Nowadays, Indoor-Location-Systems (ILS) is a significant examination branch in R&D (Research-and-Development) area. It had an extreme significance after the existence of Global Positioning System (GPS) that permits Outdoor Location including an exact accuracy. Nevertheless, GPS is not usable in structures where humans live, since no clear line-of-sight between antenna and spacecraft, the signal-data is distorted by absorption, interference and diffraction. The purpose of the thesis is to implement ILS to manipulate Zigbee devices with a computer. This ILS, which has been implemented using RSSI (Received Signal Strength Indicator) values from one slave, give too much uncertainty because of diffractions and reflections. In this project, mess topology with four slaves and one master is utilized to collect location data. The controlled car is represented as the master device because it is movable easily to check the location and responses between slaves and the master. Moreover, RSSI measurements of each slave were taken at consecutive moments using multiple samples and statistical models to process them. However, the RSSI’s values are varied and they are not exactly all the time based on comparison between the actual measurement and the RSSI formula. Therefore, trilateration is used to locate the master’s position and its coordinates in a certain area.