Development of a wireless handheld terminal for indoor gas concentration detection

The development of a wireless handheld terminal for indoor gas concentration detection is presented in this paper. The major motivation for this work is to develop a distributed wireless measuring system suitable for metal-oxide semiconductor gas sensors, usually with a wide range resistance (e.g. 0~100 MΩ), for indoor gas concentration detection. The handheld data acquisition terminal is developed by an ARM-based board and gas concentration detection node is based on MSP430. Experimental results show that the developed wireless handheld terminal is proper for most normal metal-oxide semiconductor gas sensors and has high measurement accuracy (error range: 0.5%~1.0%). In addition, the developed wireless handheld terminal has wireless transmission and control modules which make measurement and control operations more convenient and suitable for indoor air quality environmental inspection at home.