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- Title
Implementation of a Low-Cost Energy and Environment Monitoring System Based on a Hybrid Wireless Sensor Network.
- Authors
Kim, Dong Sik; Chung, Beom Jin; Son, Sung-Yong
- Abstract
A low-cost hybrid wireless sensor network (WSN) that utilizes the 917 MHz band Wireless Smart Utility Network (Wi-SUN) and a 447 MHz band narrow bandwidth communication network is implemented for electric metering and room temperature, humidity, and CO2 gas measurements. A mesh network connection that is commonly utilized for the Internet of Things (IoT) is used for the Wi-SUN under the Contiki OS, and a star connection is used for the narrow bandwidth network. Both a duty-cycling receiver algorithm and a digitally controlled temperature-compensated crystal oscillator algorithm for frequency reference are implemented at the physical layer of the receiver to accomplish low-power and low-cost wireless sensor node design. A two-level temperature-compensation approach, in which first a fixed third-order curve and then a sample-based first-order curve are applied, is proposed using a conventional AT-cut quartz crystal resonator. The developed WSN is installed in a home and provides reliable data collection with low construction complexity and power consumption.
- Subjects
INTERNET of things; CRYSTAL oscillators; COMPUTER networks; QUARTZ crystals; CRYSTAL resonators
- Publication
Journal of Sensors, 2017, p1
- ISSN
1687-725X
- Publication type
Article
- DOI
10.1155/2017/5957082