Design Of A Temperature Acquisition System Based On Single Chip Machine & Rs232 Of PC

Temperature is one of the most basic environmental parameters, and it usually must be measured in daily life and industrial & agricultural production. With the rapid development of semiconductor technology, more and more, digital & intelligent temperature measuring technology is widely applied. So it is particularly important to master the techonlogy of designing a temperature measurement & control system in hardware and software.The traditional mode of Temperature measurement adopted thermocouple or thermistor whose output is analog signals and must be converted to digital signals, then transmitted into SCM(Simple Chip Machine). So it is rather complex with little higher cost. In recent years, DS18B20(DALLAS USA), as a representative of the new digital temperature sensor with single bus, is widely used. In this project, a temperature measuring & transmition system controlled by SCM and PC is designed. At front end, the real-time temperature data acquired and converted to digital type through DS18B20 sensor are sent into SCM, and it is displayed on LCD1602 module. In addition, the acquired temperature data are transmitted to back end PC via RS - 232 interface so as to be displayed , storied and continued process.