A low-power temperature and humidity monitoring system base on WSN

A new scheme of low-power temperature and humidity monitoring system base on wireless sensor network (WSN) is proposed to overcome the weakness of the ones at present. In this paper, a star topology is used as the structure of network, and the microcontroller unit (MCU) as the main control device in base station and slave stations. Slave stations use SHT11 digital temperature and humidity sensor to complete data acquisition, and exchange data with base station by low-power multi-channel nRF905 transceiver chip. This paper introduces the hardware and software of the base station, using the communication protocol and frequency hopping (FH) mechanism to ensure the reliability of data transmission, increasing the robustness of the system. The result shows that this system has the advantage of portable, flexible arrangement, a large coverage area, low power consumption, and small disturbance, etc. The design is worth to be applied in practical applications.