The design of real-time temperature monitoring based on embedded operating system

摘要

In this paper, a new kind of system^{1 which is based on freertos operating system for greenhouse to complete the work of real-time temperature data acquisition and data transmission is designed. Firstly, DS18B20, the digital temperature sensor, is used for measuring the temperature in greenhouse, and the wireless module nRF24L01 is applied to the system to complete the data transmission remotely, the temperature data would be displayed on TFTLCD by the task scheduling of operating system and the system would give an alarm automatically when the temperature in greenhouse exceeds a certain safe limit which is set up in the program. In view of the hysteresis of the digital temperature sensor in temperature measurement, a algorithm of dynamic compensation is designed to reduce errors. After a lot of experiments and debugging, Normal functionality of the entire system could be achieved successfully and the ideal experimental results are obtained.}