Electric water heater is a kind of household appliance that can be used in bathroom, toilet and kitchen. The traditional mechanical electric water heater in the market has low control accuracy and poor reliability. With the improvement of people's quality of life, people's requirements for electric water heaters are becoming more and more intelligent and digital. Information from the market and industry shows that convenience, safety, centralization and miniaturization will be the future development trend of water heaters. This design introduces the basic method of constructing electric water heater controller with single chip microcomputer. The controller of electric water heater with perfect functions can be constructed by using AT89C series single chip microcomputer. The design of the controller can be divided into five steps: overall scheme, hardware design, software design, debugging and solidification. Its hardware system consists of three parts: input, single chip microcomputer and output. The software system design adopts modular structure, which is mainly composed of main program, interrupt service program and several function module subroutines. The advance of heating time can be inferred from the timing of single chip microcomputer, which realizes the function of saving electricity and avoids the occurrence of hot water to some extent.

Keywords: electric water heater; Single chip microcomputer; Hardware; Software; abstract

Electric boiler is a kind of household appliance that can be used in bathroom, bathroom and kitchen. The traditional mechanical electric boiler in the market has low control accuracy and poor reliability. With the improvement of people's quality of life, people are more and more inclined to ask for intelligence and digitalization. Information from the market and professionals shows that convenience, safety, centralization and miniaturization are the future development trends of water heaters. This design introduces the basic method of constructing electric boiler controller with single chip microcomputer. An electric boiler controller with more perfect functions can be constructed by using AT89C series single chip microcomputer, and the design of the controller can be carried out in five steps: general conception, hardware design, software design, debugging and solidification. Its hardware system consists of three parts: input, single chip microcomputer and output. The software system design adopts modular structure, which is mainly composed of main program, interrupt service and some function module subroutines. The method of deducing the heating time regularly by single chip microcomputer realizes the function of saving electricity to a certain extent, and avoids the urgent need for hot water in appearance. Keywords: electric boiler; Monolithic integrated circuit; Hardware; Software;

catalogue

Chapter 1 Introduction 1

1. 1 the purpose and significance of the research project

1.2 research status at home and abroad 1

1.3 main contents of the study

Chapter II Overview of Single Chip Microcomputer 3

2. 1 the concept and development of single chip microcomputer 3

2. 1. 1 system structure change 3

2. 1.28-bit and 32-bit single-chip microcomputer * * * with the development of 3

2. 1.3 The processing speed is getting faster and faster.3

2. 1.4 Low voltage and low power consumption 3

2. 1.5 Low noise and high reliability technology4

2. 1.6 The capacity of internal programs and data storage is increasing.

2. 1.7 The internal functions are getting stronger and stronger.

2. 1.8 ISP and IAP technology application 5

2. 1.9 Diversification of development and compilation environment 5

2.2 SCM structure and pin 6

2.2. 1 6-pin MCU

2.2.2 Basic Composition of Single Chip Microcomputer 7

2.3 Application Features of Single Chip Microcomputer 8

2.4 Application fields of single-chip microcomputer 8

Chapter III Design Process 10

3. 1 control requirement analysis 10

3.2 Basic design idea 1 1

3.2. 1 Main functions of the controller

3.2.2 controller design steps 1 1

The fourth chapter hardware design 13

4. 1 Keys and display circuit 13

4.2 Heating control and overheating protection circuit 13

4.3 Temperature detection part 14

4.4 leakage detection and alarm circuit 16

4.4. 1 leakage detection circuit 16

4.4.2 alarm circuit 17

4.5 Timing processing 19

4.6 reset circuit 19

4.7 Power supply fault protection circuit 20

4.8 Power supply circuit 22

4.9 Start control 25

The fifth chapter software design 26

Chapter 6 Conclusion and Prospect 3 1

6. 1 conclusion 3 1

6.2 Outlook 3 1

Reference 33

Thanks 34

Appendix a schematic diagram 35

Appendix b program listing 36

Appendix c foreign languages 46

Appendix D Translation 57 The above answers come from:/html/42-6/6477.htm.