Study of wireless indoor air quality sensor based on Modbus TCP

• Main Authors: Wei-Lun Hong, 洪偉倫
• Other Authors: Ming-Jong Tsai
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/49270285557213338611

碩士 === 國立臺灣科技大學 === 自動化及控制研究所 === 104 === In modern society, people spend most of time indoor. This leads to the importance of indoor living quality. Low living quality may cause different kinds of diseases and affect working efficiency. This study, reacts to the Industry 4.0 and the IoT developing concept, focuses on the integration of 6-in-1 indoor gas quality monitoring device and Wi-fi module, in order to supervise the concentration of noxious gases wirelessly, and implement an application of wireless transmission. Basically in common with other indoor gas quality monitoring devices in market, the device used in this study is available to detect temperature, humidity, CO, CO2, Volatile Organic Compounds (VOC), and formaldehyde (HCHO). However, most of other devices transfer their data via RS-485 or analog communication interface; and use Modbus RTU as communication protocol. Different from common approaches, this study develops a wireless technique using IAR evaluating environment on the firmware part of the monitoring device. This study, on the other hand, uses Free Modbus, which has public source code. In terms of communication protocol, Modbus TCP is chosen and applied. In back-end applications respect, this study provides a HMI (Human Machine Interface) programmed by C#. Via data logging and analyzing, values detected by monitoring machine can be clearly seen on the HMI.