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1. INTRODUCTION:
Preemptive scheduling systems are systems that can be used to foresee potentially serious damages in various domains like infrastructure, industrial machines, old monuments, dams, bridges etc. The key to preemptive scheduling lies in the collection and correlation of field data generally using a distributed network of transducers. The nature and the location of the transducer varies with the application. Conventional maintenance systems in industries and elsewhere look for damages that have happened and provide information about the damage after the damage has happened. This information though useful is not a very sensible and optimal way of running a industry.
This project proposes a novel system where in such serious damages, that can stop production, can be preempted in advance and maintenance can be scheduled accordingly. The vital as aspect of preemption systems is data from the various parts of a machine that are under constant strain. For example in a part like a ball bearing, damages don’t happen overnight. It is generally a long and gradual process, which starts with some minor deformations in the ball bearings. When such deformations happen, the machine starts to show uncharacteristic behaviors such as abrupt vibrations. Such abrupt signals can be studies and depending on a data over a prolonged duration, the extent of damage can be ascertained at a very early stage in the process.
1.1 EMBEDDED SYSTEM
Embedded System is a combination of hardware and software used to achieve a single task. Embedded systems are computer systems that monitor, respond to, or control an external environment. Environment connected to systems through sensors, actuators and other I/O interfaces. Embedded system must meet timing & other constraints imposed on it by environment
An Embedded system is a component within some larger system. It is contrast with general-purpose computers. The software in the embedded system is called firmware. An Embedded system is an intelligent firmware designed for a definite process to be achieved perfectly.
An Embedded system, in general, incorporates hardware, operating system, and peripheral devices and communication software to enable to perform the predefined functions.
In contrast to desktops that perform a variety of tasks, an embedded system performs a single, well-defined task. The system has a processor, associated peripherals, and software for a specific purpose. For example, in a mobile phone the embedded processor need to process voice (to send and receive speech signals) as well as communication protocol.
Modern automobiles, industrial control systems, aircrafts, office automation products have a number of special purpose computer hardware and associated software embedded in them to perform specific functions.
1.2 CHARACTERISTICS OF EMBEDDED SYSTEM
 In-built Intelligence.
 Immediate control of hardware.
 Uses dedicated software.
 Performs a specific function.
 Their work is subject to deadlines.
 Respond to external events.
 Timeliness, Robustness/Safety.
 Processing power and Memory limitations.
 Program is stored in nonvolatile memory such that it can be executed on power.
 Mostly interactive with I/O devices in the real world.
 Cope with all unusual conditions without human intervention