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the principle of simplified EIA of construction projects in the region. In terms of land, linked to the implementation of urban and rural construction land increase and decrease, replacement indicators for priority areas project. Charges, into the projects of water, electricity, administrative charges and preferential policies. In the area of taxation, and settled in areas of industry and its production company, within 5 years after the completion of fiscal incentives to enterprises. In terms of financing, integration of land, tax, financial and other resources, and construct \nment credit + business credit\dit system, establishment of marketization, commercialization and modernization of the investment and financing platform; effective Bank-enterprise docking, encourages private capital into the Park, to raise industry development fund. 5, optimize the environment and service industries. To create \owlands, Highlands, integrity of service land, development land\l, to optimizethe area under development environment. All administrative law enforcement departments to appoint a full-time personnel stationed in areas dedicated to coordinating and solving problems associated with businesses in this sector. When there are substantial issues, sector leaders arranged to personally intervene, in-person, in-person push tangible area building a green light, easy line. To further reduce and standardize administrative examination and approval items, simplify examination and approval links, improve efficiency; according to the ...Since the educational practice of the mass line of the party, himself seriously in the education, practical control central \nd opposing \nds\practicing %uns\nd check the spirit of Jiao Yulu, ideology, solicit opinions based on outstanding problems checked swing, careful analysis and reflection. Will now check report is as follows: first, adherence to the party's political discipline, eight in the central provision, change the style of the basic situation of 1, in compliance with the party's political disciplines. Conscientiously abide by the party's political discipline, abide by the Constitution and the rules and regulations of the party, in the political, ideological and maintain highly consistent with the CPC Central Committee on the action, there is no violation of the party's political discipline problems. 2, in the implementation of the central authorities of the eight provisions. Improving research, improving research methods, but there are less grass-roots units, primary first-hand an inadequate grasp of the problem, which is to be strengthened in the future. Second, construction, strictly in accordance with the provisions to streamline and improve the quality of meetings of the Conference. Third, streamlining file briefs, culture involves all aspects of propaganda and ideology, sometimes due to the practical needs of invention notifications, this area needs further电 子 设

treamlining. Four are standard visits, except as required to participate in training, no other activity. Five is to improve news reporting, for propaganda work strictly according to the regulations. Six is strictly your presentation published strictly according to the regulations. Seven is strictly thrift, required the use of vehicles and office space and corporate hospitality. 3, change the style. Propaganda and ideological wEspecially based on rational thinking on major issues, applying theory to guide the work done is not good enough, not really understand and grasp the spirit and essence of the scientific Outlook on development, did not truly achieve mastery, to apply, to a certain extent, affect the development and implementation of ideas and initiatives. Second, work arrangements, and less supervision. Propaganda and ideological work is the less. For example, rural culture team active, ... I'm not actively take the initiative to take up, the lack of spirit of daring to, resulting in some job had a lot of power, but no tangible results. Third, innovation, lack of motivation. Emancipation did not end, innovation does not exist. In practical work, not your head, previous work experience, lack of innovation initiatives, study on the characteristics of propaganda and ideological wtypical, and lack of high standards and strict requirements, the effect is real. Second hard drive less. On hard and计 大 赛 总 结 报 告

on and new requirements of the new tasks, had done a lot of fruitful work, has made many achievements, o keep the continuity efforts deployed, but stressed in the work time, less supervision. For example, color hrough, grip on grassroots ideological trends and changes are not deep, to promote new initiatives 学号：姓名：李永飞he grass roots, close to reality, close to the masses and also inadequate innovation must continue to improve. Second, the \trical activities, city square performances, urging townships, communities and rural areas shows the implementatihods of ideological and cultural work is not much, and some lack of relevance and timeliness. 4, discipline, low2 s 1, oppose formalism. One theory is that he didn't, with less close contact. Theoretical study of consciousness is not high enough, system performance is not strong enough; more passive learning, active learning few generalities and learn more, delving into less. s inadequate, insufficient cultural an educational role to play. Third base enough, master grass-less real. Propaganda and ideological work in the new situation of characteristics and regularity of enough, deep enough for grass-roots public opinion Dynamics survey, for grass-roots typically driveork are lacking. While working and enterprising spirit down. No real solution to treat yourself right, correctly treat past honors, their complacency, and work to see their scores more, less checking his own shortcomings, like to listen to the praise, satisfied face, online promotion, there arork of the new situatibut further closer to tobjective, which needs tweekends in the summer theaon iork under the new situation tand explore new metering, and hard wthe principle of simplified EIA of construction projects in the region. In terms of land, linked to the implementation of urban and rural construction land increase and decrease, replacement indicators for priority areas project. Charges, into the projects of water, electricity, administrative charges and preferential policies. In the area of taxation, and settled in areas of industry and its production company, within 5 years after the completion of fiscal incentives to enterprises. In terms of financing, integration of land, tax, financial and other resources, and construct \nment credit + business credit\dit system, establishment of marketization, commercialization and modernization of the investment and financing platform; effective Bank-enterprise docking, encourages private capital into the Park, to raise industry development fund. 5, optimize the environment and service industries. To create \owlands, Highlands, integrity of service land, development land\l, to optimizethe area under development environment. All administrative law enforcement departments to appoint a full-time personnel stationed in areas dedicated to coordinating and solving problems associated with businesses in this sector. When there are substantial issues, sector leaders arranged to personally intervene, in-person, in-person push tangible area building a green light, easy line. To further reduce and standardize administrative examination and approval items, simplify examination and approval links, improve efficiency; according to the ...Since the educational practice of the mass line of the party, himself seriously in the education, practical control central \nd opposing \nds\practicing %uns\nd check the spirit of Jiao Yulu, ideology, solicit opinions based on outstanding problems checked swing, careful analysis and reflection. Will now check report is as follows: first, adherence to the party's political discipline, eight in the central provision, change the style of the basic situation of 1, in compliance with the party's political disciplines. Conscientiously abide by the party's political discipline, abide by the Constitution and the rules and regulations of the party, in the political, ideological and maintain highly consistent with the CPC Central Committee on the action, there is no violation of the party's political discipline problems. 2, in the implementation of the central authorities of the eight provisions. Improving research, improving research methods, but there are less grass-roots units, primary first-hand an inadequate grasp of the problem, which is to be strengthened in the future. Second, construction, strictly in accordance with the provisions to streamline and improve the quality of meetings of the Conference. Third, streamlining file briefs, culture involves all aspects of propaganda and ideology, sometimes due to the practical needs of invention notifications, this area needs further1. 摘要 1.1目的

设计并制作一个家用电热水器控制系统，容量2升左右。水温可以在一定

范围内设定，并保持设定的温度基本不变，同时具备水位检测控制功能。

1.2方法

整个题目分温度测量与控制和液位检测两部分，温度测量和控制电热丝

加热部分由单片机控制实现，液位检测部分由开关电路实现。

1.3结果

开机后，当水位低于A点时，红色警示灯亮，水位上升至A点时，红色警

示灯熄灭。当水位到达B点时，水泵会自动断开，停止加水。此时如果加水至C点，黄色警示灯亮。

单片机键盘输入温度为40℃，原水温由温度计检测为20度，且单片机显示也为20℃。在实验过程中，单片机输入温度后，电热丝开始加热，水温从20℃可以连续上升至40℃停止，同时该系统可以实现动态温度变化不超过4℃，静态温度变化不超过1℃。

1.4结论

系统可以实现题目的基本要求，实验过程中误差较小，并且外围电路比较

简单，可以考虑用于实际。

2.关键词 STC89C54单片机 DS18b20

本系统采用STC89C54实现液位和温度控制，温度信号和液位信号由DS18b20和三极管开关电路提供，通过信号反馈来实现对水温和水位的控制，同时可以通过单片机设定温度值和显示实际温度，并且可以实现对水泵和电热丝的控制。

2. 目录

摘要------------------------------------------------------------1 关键词----------------------------------------------------------1 正文------------------------------------------------------------1 系统设计-----------------------------------------------------1 单元电路设计-------------------------------------------------2 软件设计-----------------------------------------------------4 系统测试-----------------------------------------------------11 结论---------------------------------------------------------11 参考文献--------------------------------------------------------11 附录------------------------------------------------------------11

4.正文

4.1系统设计

检测水位信号和产生警示作用由外围电路来实现，检测的水位信号传给单片

机处理，单片机通过继电器控制水泵工作。温度检测由DS18b20芯片来实现，检测的温度信号传给单片机并显示出来，然后由单片机通过继电器控制电热丝的工作。

treamlining. Four are standard visits, except as required to participate in training, no other activity. Five is to improve news reporting, for propaganda work strictly according to the regulations. Six is strictly your presentation published strictly according to the regulations. Seven is strictly thrift, required the use of vehicles and office space and corporate hospitality. 3, change the style. Propaganda and ideological work of the new situation and new requirements of the new tasks, had done a lot of fruitful work, has made many achievements, but further closer to the grass roots, close to reality, close to the masses and also inadequate innovation must continue to improve. Second, the \s 1, oppose formalism. One theory is that he didn't, with less close contact. Theoretical study of consciousness is not high enough, system performance is not strong enough; more passive learning, active learning few generalities and learn more, delving into less. Especially based on rational thinking on major issues, applying theory to guide the work done is not good enough, not really understand and grasp the spirit and essence of the scientific Outlook on development, did not truly achieve mastery, to apply, to a certain extent, affect the development and implementation of ideas and initiatives. Second, work arrangements, and less supervision. Propaganda and ideological work is the objective, which needs to keep the continuity efforts deployed, but stressed in the work time, less supervision. For example, color weekends in the summer theatrical activities, city square performances, urging townships, communities and rural areas shows the implementation is inadequate, insufficient cultural an educational role to play. Third base enough, master grass-less real. Propaganda and ideological work in the new situation of characteristics and regularity of enough, deep enough for grass-roots public opinion Dynamics survey, for grass-roots typically driveless. For example, rural culture team active, ... I'm not actively take the initiative to take up, the lack of spirit of daring to, resulting in some job had a lot of power, but no tangible results. Third, innovation, lack of motivation. Emancipation did not end, innovation does not exist. In practical work, not your head, previous work experience, lack of innovation initiatives, study on the characteristics of propaganda and ideological work under the new situation through, grip on grassroots ideological trends and changes are not deep, to promote new initiatives and explore new methods of ideological and cultural work is not much, and some lack of relevance and timeliness. 4, discipline, lowering, and hard work are lacking. While working and enterprising spirit down. No real solution to treat yourself right, correctly treat past honors, their complacency, and work to see their scores more, less checking his own shortcomings, like to listen to the praise, satisfied face, online promotion, there artypical, and lack of high standards and strict requirements, the effect is real. Second hard drive less. On hard andthe principle of simplified EIA of construction projects in the region. In terms of land, linked to the implementation of urban and rural construction land increase and decrease, replacement indicators for priority areas project. Charges, into the projects of water, electricity, administrative charges and preferential policies. In the area of taxation, and settled in areas of industry and its production company, within 5 years after the completion of fiscal incentives to enterprises. In terms of financing, integration of land, tax, financial and other resources, and construct \nt credit + business credit\dit system, establishment of marketization, commercialization and modernization of the investment and financing platform; effective Bank-enterprise docking, encourages private capital into the Park, to raise industry development fund. 5, optimize the environment and service industries. To create \cy lowlands, Highlands, integrity of service land, development land\he goal, to optimize the area under development environment. All administrative law enforcement departments to appoint a full-time personnel stationed in areas dedicated to coordinating and solving problems associated with businesses in this sector. When there are substantial issues, sector leaders arranged to personally intervene, in-person, in-person push tangible area building a green light, easy line. o further reduce and standardize administrative examination and approval items, simplify examination and approval links, improve efficiency; according to the ... Since the educational practice of the mass line of the party, himself seriously in the education, practical control central %ules\cing %uns\check the spirit of Jiao Yulu, ideology, solicit opinions based on outstanding problems checked swing, careful analysis and reflection. Will now check report is as follows: first, adherence to the party's political discipline, eight in the central provision, change the style of the basic situation of 1, in compliance with the party's political disciplines. Conscientiously abide by the party's political discipline, abide by the Constitution and the rules and regulations of the party, in the political, ideological and maintain highly consistent with the CPC Central Committee on the action, there is no violation of the party's political discipline problems. 2, in the implementation of the central authorities of the eight provisions. Improving research, improving research methods, but there are less grass-roots units, primary first-hand an inadequate grasp of the problem, which is to be strengthened in the future. Second, construction, strictly in accordance with the provisions to streamline and improve the quality of meetings of the Conference. Third, streamlining file briefs, culture involves all aspects of propaganda and ideology, sometimes due to the practical needs of invention notifications, this area needs further（1）温度测量部分

方案一

采用热敏电阻，可实现40℃到90℃测量范围，但热敏电阻精度、重复性、可靠性较差。

方案二

采用18b20，它的测量温度范围为 -55℃—+125℃，在-10℃—+85℃范围内,精度为±0.5℃，具有测温系统简单、测温精度高、连接方便、占用口线少等优点。

（2）驱动控制部分

方案一

全部采用外部电路，通过电压、电流实现信号的检测和控制，但是电路比较复杂，容易受干扰，导致稳定性不好，误差较大。

方案二

采用单片机程序控制，可以使外围电路简化，减少外部干扰，能够准确控制，且误差较少。

4.2单元电路设计

4.2.1输出为5V的直流稳压电源

整流电桥将正弦交流电转换成单向脉动的直流电，但还有很大的波纹，并联小的电容可以滤去频率较大的正弦波，并联大电容可以滤去频率较小的正弦波，从而使直流分量更加稳定，7805可以使电路输出保持5V电压。此电路在试验过程中给各级电路及水提供5V电压。

treamlining. Four are standard visits, except as required to participate in training, no other activity. Five is to improve news reporting, for propaganda work strictly according to the regulations. Six is strictly your presentation published strictly according to the regulations. Seven is strictly thrift, required the use of vehicles and office space and corporate hospitality. 3, change the style. Propaganda and ideological work of the new situation and new requirements of the new tasks, had done a lot of fruitful work, has made many achievements, but further closer to the grass roots, close to reality, close to the masses and also inadequate innovation must continue to improve. Second, the \nding issues 1, oppose formalism. One theory is that he didn't, with less close contact. Theoretical study of consciousness is not high enough, system performance is not strong enough; more passive learning, active learning few generalities and learn more, delving into less. Especially based on rational thinking on major issues, applying theory to guide the work done is not good enough, not really understand and grasp the spirit and essence of the scientific Outlook on development, did not truly achieve mastery, to apply, to a certain extent, affect the development and implementation of ideas and initiatives. Second, work arrangements, and less supervision. Propaganda and ideological work is the objective, which needs to keep the continuity efforts deployed, but stressed in the work time, less supervision. For example, color weekends in the summer theatrical activities, city square performances, urging townships, communities and rural areas shows the implementation is inadequate, insufficient cultural an educational role to play. Third base enough, master grass-less real. Propaganda and ideological work in the new situation of characteristics and regularity of enough, deep enough for grass-roots public opinion Dynamics survey, for grass-roots typically drive less. For example, rural culture team active, ... I'm not actively take the initiative to take up, the lack of spirit of daring to, resulting in some job had a lot of power, but no tangible results. Third, innovation, lack of motivation. Emancipation did not end, innovation does not exist. In practical work, not your head, previous work experience, lack of innovation initiatives, study on the characteristics of propaganda and ideological work under the new situation through, grip on grassroots ideological trends and changes are not deep, to promote new initiatives and explore new methods of ideological and cultural work is not much, and some lack of relevance and timeliness. 4, discipline, lowering, and hard work are lacking. While working and enterprising spirit down. No real solution to treat yourself right, correctly treat past honors, their complacency, and work to see their scores more, less checking his own shortcomings, like to listen to the praise, satisfied face, online promotion, there are typical, and lack of high standards and strict requirements, the effect is real. Second hard drive less. On hard and第3页 共15页