ZigBee-based Temperature Controlling System for Agricultural Greenhouses

Abstract

this paper introduced a temperature controlling system designed for agricultural greenhouses by making use of the ZigBee technology. DS18B20, the in-line temperature sensor was used for temperature collection, which can be transformed into a digit directly. In wireless communication, ZigBee, the protocol stack was used for relevant modification on the application layer so as to implement wireless communication over the ZigBee protocol. The whole temperature collection process and wireless communication were all completed by the CC2530 functional node module by IAR Embedded Workbench, which was an integrated development environment. One functional node of CC2530 was designed to collect temperature and send it as a terminal node. The other functional node of CC2530 was responsible for receiving temperature as a coordinator and transmit the temperature to the STM32F103RBT6 development board by the serial port communication technology. The collected temperature can be shown on the 3.2-inch TFT LCD screen and the display drive can be completed on the STM32F103RBT6 board, on which the rotation of the stepping motor can be driven. The whole development process was implemented by the MDK software developed by Keil. The data can be transmitted between the CC2530 functional node module and the STM32F103RBT6 development board by the serial communication technology. Ultimately, the system test indicated that data can be transmitted correctly and the transmission is stable so that the greenhouse management requirement can be met.