Letter of appointment for graduation design thesis

East china institute of technology (Department) Professional Class

Design of Smart Home Security System

Theme Home Safety Design (2 persons)

Issue date: 20 10 1 1.25.

Start time: from 201165438+February 28th.

Completion time: to May, 20 1 1 year (final version)

Date of reply: year month day

Student's last name:

Instructor:

Director of teaching and research section:

1, subject source, purpose and significance

Source: Other

Objective: The purpose of family safety is to ensure that family members are not harmed and family property is not infringed. Family safety system and new safety technologies and methods should effectively guarantee and realize the purpose of family safety. At present, in high-grade villas, high-grade residential quarters and high-grade houses in Beijing, Shanghai, Guangzhou and other places, it is gradually becoming a trend to install family anti-theft alarm system on the basis of existing residential security, and even becoming a comparison between neighbors. Family safety precautions, take the key and initiative of safety protection in your own hands. That is to say, it can prevent the negligence of community security from providing opportunities for criminals, and it can also prevent individual security guards from stealing things from inside. Especially for single-family villas, neighborhood watch is not easy to achieve, and perimeter prevention and family alarm are more important. In recent years, the number of people buying houses has ranged from hundreds of thousands to millions or even tens of millions. After buying a house, people rarely consider the investment in home improvement and furniture accessories.

Consider the safety of occupancy and prevent investment. The latter does not invest much. It's just that people don't have enough consciousness. domestic

Safety precautions are also an integral part of family living expenses. Perhaps, I have installed a home security alarm system and have never used it once in my life. But no one dares to say it's useless. If you don't install the home security alarm system, you will regret it once in your life if you encounter robbery or injury. Home security is not everything, but it is absolutely impossible without home security.

Meaning: 1 Anti-theft: can find illegal thieves, call the police in time or on the spot.

2. Robbery prevention: If someone is robbed at home, you can send an alarm signal.

3, help: can be used for home elderly, children accidents and emergency alarm.

4. Fire prevention: the smoke detector detects smoke and sends out a fire alarm.

5. Prevention of combustible gas poisoning: it can detect the leakage of gas/liquefied petroleum gas/natural gas and give an alarm in time.

6. Automatic alarm: Once an alarm is given, the host will automatically dial the set six groups of telephones to receive the alarm.

7. Remote monitoring: After the alarm phone is connected, the indoor scene can be monitored immediately.

8. Remote control in different places: it can be deployed or disarmed by telephone in different places.

9) Surveillance photography: If someone commits a crime, the host can call the police at the same time, and the camera can automatically take pictures. The recorded images and photos can provide accurate and reliable evidence for the public security department to solve the case.

2. Theme type

design

3. Main objectives and technical parameters to be achieved in the design.

Objectives: Sensors such as temperature, smoke and infrared should be detected in real time, and the control system should respond to the data of each sensor, including the following three aspects:

1, anti-theft design

2. Fire alarm

3. Poison gas alarm

Technical parameters:

1 with a resolution of 8 bits.

2. Maximum unadjusted error: 0809 is? 1LSB .

3. Single power supply +5v, the reference voltage is provided by the outside, and the typical value is +5v. At this time, the input analog voltage is allowed to be 0-5V.

4.8 analog gating switches with latch control.

5. The three-state output can be latched, the output level is compatible with TTL level, and the power consumption is 15mW.

6. The conversion speed depends on the clock frequency of the chip. When the clock frequency range is 500KHz, the conversion time is128 μ s.

Step 4 design specific tasks

1 software design;

1, A/D conversion subroutine

2. Display alarm program module

3, anti-theft control program

4, fire control procedures

5, gas leakage control program

6, the main program

2 Hardware design:

1, gas alarm module (including gas leakage detection, sound and light alarm when gas leaks, cutting off the main power supply at home and notifying the property)

2, anti-theft module (including infrared detection. There is a conversion system. When the owner is at home, infrared detection still works, but no alarm is given; When the owner is not at home, infrared detection will immediately send an alarm signal from the door or window and notify the property. (1, 2, 3 have sensor part, signal conditioning part, A/D conversion part, alarm display part, etc. )

3. The property office has three displays of fire, gas leakage and burglar alarm, corresponding to the building number, unit number and house number respectively.

4. Select the single chip microcomputer system.

5 design requirements

1. Home security system requires small size, low cost, easy operation, easy maintenance and easy installation.

2. By studying intelligent control technology and comparing the working characteristics of common security systems in the market at present, the design scheme and implementation method of home security system are put forward.

3. By designing the hardware circuit of the home system, we can think of the realization principles of other types of products, so as to compare their advantages and disadvantages and facilitate future improvement.

4. Write the flow chart of the control software program to realize the intelligent control of the home system.

5. Study the interference of equipment to improve the anti-interference performance of home system.

6 technical difficulties

Design scheme;

7 timetable

65438+1Internship from October 6th to March 22nd; Literature retrieval and familiar content

March 23rd-April 16 scheme confirmation; Circuit diagram; Paper frame

Software design from April 16 to April 30; First draft of thesis

May 08-May 20 revision; Finalization of thesis

8 important tips

Design book: hardware circuit and principle description; Software design ideas; Program flow chart and list.

9 references

[1] Electronic Circuit Design Xie Huazhong Publishing House

[2] New devices and their applications in intelligent instruments and data acquisition systems [M] Yang Zhenjiang xidian university Publishing House, 2000.

[3] Reactive Power Compensation and Power Electronics Technology Su Wencheng and Jin Jinkang Machinery Industry Press, 1989.

[4] MCU C language application program design [M] Ma Zhongmei Beijing University of Aeronautics and Astronautics Press, 1999

[5] Pattern Recognition Bian Tsinghua University Publishing House, 1988.

[6]Intel l 16-bit MCU Sun Beihang University Press, 1995.

[7] "MCU C language application design" Ma Zhongmei Beijing University of Aeronautics and Astronautics Press, 2007.

[8] J.C. Bezdek. Pattern recognition based on fuzzy objective function algorithm. New york: Plenary Session Press, 198 1.

Back T. Application of evolutionary algorithm in theory and practice [M]. new york: Oxford University. News. 1996.

2. The main contents and requirements of the task (including original data, materials, technical parameters, work requirements, etc.). It requires real-time detection of sensors such as temperature, smoke and infrared rays, and the control system should respond to the data of each sensor accordingly.

The hardware module includes:

1, reactive power measurement module (module should choose appropriate sensors, signal conditioning circuits, etc. ). Measurement includes voltage measurement and current measurement)

2. A/D conversion module

3. Choose a suitable single chip microcomputer system.

4. Display module (real-time display of reactive power)

5. The software module of reactive power compensation control (number of capacitor banks, control strategy, how to input capacitor banks and how to cut off capacitor banks) includes:

1, A/D conversion subroutine

2, reactive power calculation algorithm

3. Display program module

4, reactive power compensation algorithm

5, compensation capacitor bank input, removal strategy

6, the main program

3, the basic requirements of graduation design (thesis) project results (including graduation design (thesis), charts, physical samples, etc.). )

1. The reactive power compensation device is required to be small in size, low in cost, easy to operate, easy to maintain and install.

2. By studying reactive power compensation technology and comparing the working characteristics of several capacitor switches at present, the design scheme and implementation method of capacitor switching reclosing switch are put forward.

3. By designing the hardware circuit of the compound switch, the shortcomings of other types of switches, such as inrush current, harmonics and high power, can be solved.

4. Write the control software program flow chart to make the compound switch switch intelligently and operate more intelligently.

5. In order to improve the anti-interference performance of compound switch, the interference of devices is studied.

4. Time schedule.

65438+1October 6-March 22 internship; Literature retrieval and familiar content

March 23-April 16 scheme determination, circuit diagram drawing and paper outline.

April1June-May 7 Software design, first draft of the paper.

From May 8th to May 20th, the paper was revised and finalized.

5, the main references, materials and reference books (at least 2 foreign languages and 5 Chinese).

Zhu Junwei. Power system analysis [M]. Beijing: Water Conservancy and Electric Power Press, 1995.

[2] Yang Zhenjiang. New devices and applications in intelligent instruments and data acquisition systems [M]. Xi An: xidian university Publishing House, 2000.

[3] Su Wencheng, Jin Zikang. Reactive power compensation and power electronics technology. Beijing: Machinery Industry Press, 1989.

[4] Ma Zhongmei. Single-chip microcomputer C language application program design [M]. Beijing: Beihang Press, 1999.

Bian et al. Beijing: Tsinghua University Publishing House, 1988.

[6] Jin and Ding Yushan. Practical technology of reactive power compensation in power grid. Beijing: China Water Resources and Hydropower Press, 2008.

[7] Ma Zhongmei. C language application program design of single chip microcomputer. Beijing: Beijing University of Aeronautics and Astronautics Press, 2007.

[8] J.C. Bezdek. Pattern recognition based on fuzzy objective function algorithm. New york: Plenary Session Press, 198 1.

Back T. Application of evolutionary algorithm in theory and practice [M]. new york: Oxford University. News. 1996.

Graduation Design (Thesis) Opening Report

1, the significance of research, the research trends at home and abroad and my own opinions.

With the rapid development and sustained growth of the national economy, electric power construction has made remarkable achievements. However, the contradiction between supply and demand of electronics has become increasingly prominent, and the serious shortage of power supply has restricted the development speed of the national economy. In order to alleviate the current and future contradiction between power supply and demand and fundamentally solve the problem, in addition to increasing power generation, various energy-saving measures should be taken to the maximum extent.

It is also important to make good use of existing power facilities. Using reactive power compensation technology to tap the potential of existing power resources is one of the feasible measures to get quick results and save a lot of electricity. Reactive power compensation can save electricity expenses, reduce system energy consumption, reduce active power loss by 20% ~ 45%, and improve voltage quality. After field compensation, the power factor of three-phase asynchronous motor is improved due to the decrease of current, thus increasing the capacity of transformer.

In the power grid above 10kv, for safety reasons, automatic reactive power compensation devices are rarely used. In addition, the principle of reactive power compensation on the spot as much as possible, low-voltage automatic reactive power compensation devices have been widely used, and new technologies are constantly emerging. There are several methods of reactive power compensation at home and abroad. There are reactive power compensation methods for low-voltage distribution network, reactive power compensation for high-voltage distribution network and intelligent low-voltage dynamic reactive power compensation technology.

I personally prefer intelligent dynamic reactive power compensation technology. Due to the continuous development of power electronics technology, intelligent control technology and information communication technology, many new power technologies and equipment have emerged. In recent years, with the transformation of urban and rural power grids, intelligent reactive power compensation technology has been widely used in public distribution transformers of low-voltage distribution networks all over the country. It integrates the functions of low-voltage reactive power compensation, comprehensive monitoring of distribution, line loss measurement of distribution station, voltage qualification rate evaluation, harmonic monitoring and so on. At the same time, the combination with distribution dynamic system is fully considered.

2. The main contents of the study, the key problems to be solved and the expected results.

This topic mainly studies the real-time detection of voltage and current, the calculation of reactive power and the design of compensation method. The hardware part should include reactive power measurement module, A/D conversion module, suitable single chip microcomputer system, display module and reactive power compensation control. The software part includes A/D conversion subroutine, reactive power calculation algorithm, display program module, reactive power compensation algorithm and main program of capacitor bank switching strategy.

3, research methods, design scheme or thesis writing outline

Low-voltage centralized compensation is adopted to realize power compensation. Hardware circuit design involves model selection of single chip microcomputer, power supply circuit design, sampling circuit design, A/D conversion, power factor measurement circuit and reset, display and drive circuit design. The software part includes the measurement of power factor angle, the calculation of reactive power and the switching control of capacitor banks.

Figure 1 Hardware Circuit Design

4, research preparation (bibliography, conditions to complete the task, etc. )

5. Overall arrangement and progress of graduation project (thesis)

65438+1October 6-March 22 internship; Literature retrieval and familiar content

March 23-April 16 scheme determination, circuit diagram drawing and paper outline.

April1June-May 7 Software design, first draft of the paper.

From May 8th to May 20th, the paper was revised and finalized.

6. Instruct teachers' opinions and suggestions (the academic and practical significance of the topic, the general situation of the research on the content of the topic at home and abroad, whether there are innovative contents, the rationality of the topic, whether there are conditions for opening the topic, the existing difficulties and difficulties, suggestions, etc.). )