Recent advancements in air pollution monitoring, natural disaster monitoring, forest fire detection, landslide detection, water quality monitoring, has set a new stage for Wireless Sensor Networks (WSNs). WSNs capability to gather and process data in real time has made monitoring of various environments possible. Zig-Bee, a high level communication protocol together with WSNs finds applications in home automation, office automation and environment monitoring. This paper proposes an event based self-monitoring WSNs and hardware implementation. The proposed method is used to provide smart office services that include various parameters using advanced cortex microcontroller.