Abstract
With the era of progress and development, SCM technology has spread to our lives, work, research, in various fields, has become a relatively mature technology, introduced a paper-based AT89C51 SCM temperature measurement system, described The use of digital temperature sensors DS18B20 temperature measurement system process, the sensor in the SCM hardware connection, software programming and the modular system processes an analysis of the various parts of the circuit also were introduced on January 1, the system can be Facilitate the realization of acquisition and display temperature, high sensitivity, small size, low power consumption advantages suited to our daily lives and industrial and agricultural production in the temperature measurements, as the temperature processing module can be embedded in other systems, as the other Supporting expansion of the main system.
This design from the use of the main ideological and distributed by a stage crew (PC micro-computers), the next crew (SCM) multi-point temperature data collection, composed of two multi-point temperature measurement Distributed roving detection system. The system uses RS-232 serial communication standards, through the host computer (PC) under the control of crew (SCM) on-site temperature acquisition. The temperature measurement system to obtain and display eight of temperature data, can be directly applied in a number of occasions the need to measure temperature..
The design of the multi-point temperature measurement system by the microcontroller, temperature measurement circuit, alarm circuits, keyboard / display interface circuits, modules and keyboard interface module total of six modules. In this paper, more than six parts of the hardware and software design a detailed exposition on the Selection of the core chip, the external circuit connections, chip and the connection between the circuit chip, program design methods and the corresponding software programs.
The system is simple, strong anti-interference capability, suitable for harsh environments spot temperature measurement.It will have a broad prospect.
Key words :DS18B20 multi-point measurements of temperature single chip microcomputer