基于电话线的PC远程控制家用电器中英文翻译.doc

附录A PC REMOTE CONTROL OF APPLIANCES BY USING TELEPHONE LINES ABSTRACT The idea of Home Automation using telephone lines and a PC was shown in this study. The system was based on the Dual Tone Multifrequency (DTMF) signals that could be sent through a loop of wire to switch on/off various appliances via a Personal Computer (PC). The system hardware and software were designed based on the Telephone Standards. The hardware part included the DTMF receiver On/Off Hook detector, Ring detector and an Input/Output PC Interfacing card. An example of controlling an appliance was provided in the study. The software control programming was written in Turbo Basic and their flow charts are presented here for the readers attention. INTRODUCTION Home Automation that was introduced in this study was implemented by designing the Smart Control System that Controls All Appliances Remotely by Phone. The design was based on the Telephony Standards which meant that the system was qualified to be installed on the public switching systems. The system design was utilizing the Dual Tone Multifrequency (DTMF) signals that could be produced by the telephone set. These signals were sent from the user end through the loop wire to the destination end, where the control system was stationed. The system consisted of three major parts. The first part was the ring detector and DTMF receiver. The second part was the Input/Output interface unit. The third part was the personal computer which was programmed with Turbo Basic Software to perform the on line operations. Block diagram of the system was shown in figure 1. ? Figure1:Smart control system to control Appliances remotely by phone BRIEF OPERATION OF A TELEPHONE SET: A summary of the telephone set operation was given here for the reader to visualize the system operation. Block diagram of a telephone set is shown in figure2. (a)Local loop: Each subscriber telephone was connected to an exchange office that contained the switching equipment, signalling