DS18B20 temperature sensor is selected in this design. DS18B20 is the latest single line digital temperature sensor of Dallas company. It has smaller volume, wider applicable voltage and more economy. DS18B20 is the first temperature sensor in the world that supports "one wire bus" interface. The unique and economic characteristics of the first-line bus make it easy for users to build sensor networks and introduce new concepts for the construction of measurement systems. His measurement temperature range is - 55, + 125 ℃, in the range of - 10, + 85 ℃, and the accuracy is Zero point five ℃。 The field temperature is directly transmitted by "one line bus" digital mode, which greatly improves the anti-interference of the system. It is suitable for on-site temperature measurement in harsh environment, such as environmental control, equipment or process control, temperature measurement consumer electronic products, etc. DS18B20 can program the resolution of 9,12 bits with the accuracy of Zero point five ℃。 Smaller packaging mode, wider voltage application range, resolution setting and user set alarm temperature can be selected and stored in E2PROM, which will still be saved after power failure. The performance of DS18B20 is the best in the new generation of products, and the performance price ratio is also excellent. Following the early products of "one line bus", DS18B20 has opened up a new concept of temperature sensor technology. DS18B20 and ds18b22 give us more choices of voltage, characteristics and package, so that we can build our own economic temperature measurement system.<br>
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