DS18B20 is a digital thermometer sensor, which could construct networks, On the of the particular merits of one-wire bus, sensor networks can be built up easily, which make multi-temperature measuring circuits become simpler and more reliable. This design spread with new arithmetic figure to sensor to constitute the temperature to measure and control for core with the machine of 8 single slices system. Single slice of the system's ATMEL AT89C51 of INTEL MCS-51 instruction of adoption of this system machine conduct and actions MICROARRAY , complete the temperature worth receive, conversion, report to the police to handle; New and single road string produced by DALLAS line the arithmetic figure temperature sensor DS18B20, and complete the temperature to measure, analysis, judgment the worth, output function. Whole system has to gather the degree is high, the dependable is strong, anti- the interference is strong (String line correspondence characteristics), can expand the strong (can make use of serial number to identify the preface row), smaller capacity, lower power consumption and so on. This system has the function of the thermometric, upper limit to report to the police, bottom the report to the police, temperature control and show on. According to this system can expand the following function: 1. increase the keyboard to make to can at any time adjust the temperature the top and bottom. 2. Expand to spread to arithmetic quantity, and constitute the diagraph network. Realize many point of diagraph. At the same time to basic and internal construction for machine each proceed order of quality contrast, introducing the temperature of single line arithmetic figure spreading arithmetic and main function characteristics of single slice of MCS-51.
Keywords： Alarm，DS18B20，control
