Microcontroller based home automation and security system

ABSTRACT Industrial automation systems have been used for over a century. The usage of these systems at home has been realized by the improvement of the production technologies. According to the result of market researches; most of the houses need home automation. For this reason, to make this kind of systems common, among the houses, it is getting more important to lower the system coast. This application describes a low cost home-automation system, which is based on a microcontroller. In this study, the working principles of the hardware and the software are explained and the possible usage of the system is presented. The schematic diagram, machine code source and flowchart of the system are also given. Relatively, less electronic elements are used in the design to minimize the cost and the power consumption of the system. Although this system is designed as a stand-alone system, some system resources are reserved for further improvements like communication with other devices and/or PC. System has 16 inputs and 16 outputs. The 8 of the inputs can be used as analog or digital while the others can only be used as digital inputs. Device controls the outputs according to the user settings by evaluating time and the input data (temperature, light, humidity, logic switch, door pass sensor, etc.), that is acquired from sensors and external devices. For example; user can set the device to turn the outdoor lights on at a certain time by using the keypad of the device. The device can also be set to control the outdoor lights to work at a desired power depending on time and outdoor illumination level. This study has been awarded with the 3rd prize in the Digital Technology Project Contest, which is organized by BEKO Elektronik A.Ş in 2001. No project has been found to be eligible for the first prize, in this contest. Keywords: Home automation, control, 68HC908GP32