The temperature is one kind of the most fundamental environment parameter , life of the people and the environment temperature are vitally interrelated , need the real time measurement temperature in industry procedure of production, the method and device measuring , studying therefore the temperature measurement also being unable to be seprated from the temperature in giving birth to a child in agriculture has important significance. Measuring the temperature key is that the temperature sensor , development of the temperature sensor have experienced three developing a stage: (2) discrete tradition temperature sensor (1), simulates the integrated integrated temperature sensor, (3) intelligence temperature sensor. At present, on the international, the new model temperature sensor is developing at full speed from simulating style to the digital , from the integrated-rization direction to intellectualized, network-rization.
DS18B20 designing that I choose originally is the originally systematic temperature sensor , 89 C2051 choosing the monolithic machine are to measure and control systematic core functions such as coming to accomplish the data collect , to handle , show , giving an alarm. It incorporates the temperature measurement , A/D changes Yu an integral whole, have merit such as the Shan highway structure , figure amount output. Select and use figure temperature sensor DS18B20, province but sampling/ hold circuit , a circuit, have shortened systematic on-time , have reduced systematic hardware cost. And, with 4511, the decoder drives LED demonstrating temperature value.
Method having pursued , having used in software design the module programming in the board designing that middle , the hardware design have used implement PROTEL99SE to make principle picture and PCB this time makes the logic structure clear. Have used the oscillograph , multimeter , fever to record an implement in testing process, programming implement and their software。
Keywords: AT89C2051 Temperature measurement DS18B20 LED is demonstrated Single-chip microcomputer(SCM)