A NETWORKED EMBEDDED SYSTEM FOR MONITORING AND CONTROL

Many computer-controlled systems are distributed, consisting of computer nodes and a communication network connecting the various systems. It is not uncommon for the sensor, actuator, and control calculations to reside on different nodes. Wireless connections permit to apply these control systems in a wide spectrum of application and environments. In this paper, we describe the development process of small, low cost and powerful embedded systems based on open source kernels and Zigbee protocol. The development is based on a small, customisable and embeddable real-time kernel called eRTL. eRTL is a RTLinux-GPL version kernel wich is deployed without the Linux kernel. Wireless communication are provided by means of a communication architecture by means of a algorithm of communication. This protocol schedules the packet data using a policy called EDF (Earliest Deadline First) which assigns priorities taking into account temporal. An example of a network sensor is build to illustrate the use of the architecture.