高精度数显温度测控仪的设计毕业论文设计.doc

PAGE PAGE 1 摘 要 温度，是人类社会环境中极其重要的一个因素。不管你的生活环境怎样，从事的工作是什么，我们无时无刻不在与温度接触。自从欧洲工业革命开始，工业发展的兴衰与掌握温度的程度休戚相关。医药、钢铁、石化、水泥、冶金等等行业都需要考虑温度对其生产的影响，除此之外，温度不仅仅对于工业生产具有很重大的意义，在农业生产中对温度的测量与控制也尤为重要。 随着养殖业的蓬勃发展，自动化控制的鸡舍不断应用到实际生产中，鸡舍的温度控制系统就变成了十分贴近生活的课题，这不仅可以节约大量人力物力，还有力的保障了生产效率。因此设计温度测控系统应用与生产生活中显得迫切。 本系统是一种基于STC89C52单片机的温度测量及控制系统，该系统温度信号由数字温度传感器DS18B20采集，发送给STC89C52单片机进行处理，并通过LCD液晶显示器显示。控温部分使用的是4个独立按键进行温度上限和下限的设定，当实际温度超过设定值范围后，单片机将发出控制信号启动升温装置或降温装置，使温度保持在一定的范围。整个系统由温度测量采集电路、LCD显示电路、报警电路、按键电路、继电器控制电路、散热器及加热器工作电路组成。 关键词：STC89C52，DS18B20，液晶显示器，温度测控 Abstract Temperature is a very important factor in social environment. No matter what your living environment and what your job are, we every contact with temperature. Since the industrial revolution in Europe, the degree of temperature rise and fall with the master should be bound together in a common cause of industrial development. Medicine, steel, petrochemical, cement, metallurgy industry and so on need to consider the effect of temperature on the production, in addition, temperature not only , the agricultural production in the temperature measurement and control is particularly important. With the rapid development of aquaculture, the automatic control of the , the temperature control system of save a lot of manpower and material resources, and guarantee the production efficiency. Therefore, the design of temperature control system application and production of life is urgent. A temperature measurement and control system based on STC89C52 is designed. The temperature signal was sampled by digital temperature sensor DS18B20, was transmitted to the microcontroller STC89C52, and was displayed by LCD. Four separate buttons were used to set the upper and lower limit of temperature. The control signal would be given by the MCU to start devices when the temperature was out of the range. The system consists of a temperature measurement acquisition circuit, LCD display circuit, alarm circuit, a key circuit, relay control circuit radi