Room environment monitoring system from PDA terminal

A room environment monitoring and control system, via a PDA terminal, was designed and fabricated. An RF wireless sensor module with several air quality monitoring sensors was developed for an indoor environment monitoring system in home networking. The module has the capacity for various kinds of sensors such as humidity sensor, temperature sensor, CO₂ sensor, flying dust sensor, etc. The developed module is very convenient for installation on the wall of a room or office, and the sensors can be easily replaced due to a well-designed module structure and RF connection method. To reduce the system cost, only one RF transmission block was used for sensor signal transmission to an 8051 microcontroller board using a time sharing method. In this home networking system, various indoor environmental parameters could be monitored in real time from the sensor module. Indoor vision was transferred to the client PC or PDA from a surveillance camera installed indoors or at a desired site. A Web server using Oracle DB was used for saving the vision data from the Web-camera and various data from the wireless sensor module.