Wireless sensor network application for carbon monoxide monitoring

Carbon monoxide (CO) is an odorless, tasteless and colorless gas in which it is difficult to be recognized by human beings. CO gas that enters the human body at a certain concentration has negative impact on health. A monitoring system which can recognize the amount of CO gas concentration, especially for the indoor is needed to cope with this problem. In this paper, monitoring system is designed using XBee as a data transmission medium. Three XBee are integrated with the sensor node circuits, microcontroller as a data processor and one XBee as a data collector. The sensor nodes consist of an LM35DZ temperature sensor, a humidity sensor HSM 20-G and a CO sensor TGS 2600. The data are read by sensor nodes and then they are transmitted wirelessly using XBee. The data collector functions as the receiver, processor and data viewer in the form of tables and graphs using Visual Basic 6.0. From this design, the results of data transmission can be displayed in the form of graphs and tables which are then stored into the database. The data transmission range is ± 53 meters indoor, where the average error TGS 2600 sensor reading is 4.414 %.