TheDesignforMulti-pointWirelessTemperatureandHumidityAcquisitionUSB-based.docVIP

The Design for Multi-point Wireless Temperature and Humidity Acquisition USB-based Xiao-Ping Zong Hebei University College of Electronic and Informational Engineering, BaoDing China e-mail: zongxiaopingsyyc@ Wei Liu Hebei University College of Electronic and Informational Engineering, BaoDing China e-mail: sjzliuwei@ Abstract—Wireless temperature and humidity acquisition system is designed in this paper using PT100 thermal resistances and HS1101 sensors. The system is composed of thermal resistances using C8051f330 microcontroller with two-wire resistance measurement circuits, HS1101 frequency output circuits, 2.4 GHz ISM band RF transceiver chips nRF24L01 with multi-point sending and receiving, combination of wireless communication receiver modules CY7C68013. System uses the USB2.0 send temperature and humidity data to the PC, and display the curves of LabWindows / CVI real-time temperature and humidity. Keywords- temperature and humidity acquisition; wireless; USB2.0 Introduction Detection of temperature and humidity is widely used in the production and living, for example food storage, the digital of agricultural, medical monitoring and other industries and so on. The design proposes a simple and feasible way for multi-point wireless temperature and humidity detection. The system has the advantages of low cost, low power consumption, without wiring and set up networks, especially the scene when the environment is not easy to set up lines. Using the system for monitoring temperature and humidity becomes more efficient and fast. Overall system design The system is composed of a master machine and several slave machines, as shown in Figure 1. The temperature and humidity data are collected from the slave machines. The slave machines send the data to the master through the nRF24L01 wireless modules. Master data are transferred through USB interface to the PC, and are displayed with LabWindows?/ CVI real-time curves. Hardware and Software designs of