| With the rapid development of social economy and our nation's living standard,, a number of guard and alarm systems have been set up in our residential quarters, so people will enjoy a better living environment and the properties will be safe, and the alarm systems will meet their bright future.In the first paragraph, we will discuss the background of alarm systems in our country at first. Then, according to their insufficient parts, we will better them in these three directions. Firstly, this equipment can automatically work and quit according to the actual actions of the houses; Secondly, the communicating signals will go through the power transmission lines after being modulated .At last, in order to ensure the safety of the family ,we must use the language-definition system to distinguish the identifications of all the guests.In the second paragraph, we have design a set of improved-interior alarming system, which has been divided into four parts: the input module,the output module,the system module and the transmission module. The input module includes the sensor circuits and noise filters; the transmission module is composed of the power-line and the interface circuits between the input module and the system module; the system part includes the MCU system,its memory part,its keypad part and its power part; the output module consists of the tone part and the telephone part.; In the third paragraph, we will design the hardware of each module, their interface circuit and the relating chips; in the fourth paragraph, we will introduce the program codes; In the paragraph, we will combine all of them together and make a conclusion of the improved functions of the system.In last paragraph, we will make a conclusion of this article.In this article, we have designed a set of improved interior alarming system. So we can provide the theory guides for the predecessors in this science project. And what's more, we can provide a specific mode for the next generations of this product.
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