This book constitutes the thoroughly refereed post-conference proceedings of the First International Conference, SENSAPPEAL 2009, held in Athens, Greece, in September 2009.

The 12 revised full papers were carefully reviewed and selected from 24 submissions. The papers cover various topics such as WSN for fire hazard detection and monitoring, WSN for precision horticulture, a nephelometric turbidity system for monitoring residential drinking water quality, deployment of a wireless ultrasonic sensor array for psychological monitoring, WISEBED: an open large-scale wireless sensor network testbed, SmartEN: a Marie Curie research framework for WSN in smart management of the human environment, embedded web server for the AVR butterfly enabling immediate access to wireless sensor node readings, as well as TinySPOTComm: facilitating communication over IEEE 802.15.4 between Sun SPOTs and TinyOS-based motes.

Wireless sensor networks (WSNs) are envisioned to enable a variety of applications including environmental monitoring, building and plant automation, homeland se- rity and healthcare. It has been argued that one of the key characteristics of sensor networks is that they are tightly coupled with the applications running on top of them. Although WSNs have been an active area of research for over a decade, real world sensor network deployments have not yet found their way to widespread adoption. The experience gained and lessons learned during the initial attempts to deploy WSNs and implement various sensor network applications are very valuable for the - vancement of this technology. Recognizing the need of a conference dedicated to practical aspects of WSN p- taining to their employment in a plethora of applications, ICST launched SENSAPPEAL as a yearly event whose first edition took place in September 2009 at the Athens Information Technology campus in the outskirts of Athens, Greece.