2. CONTENTS:  INTRODUCTION & HISTORY  EXISTING SYSTEM & DIS-ADVANTAGES  PROPOSED SYSTEM  RESULT ANALYSIS  ADVANTAGES  APPLICATIONS  CONCLUSION

3. WHAT IS MEANT BY EMBEDDED SYSTEM ?? Before knowing what is meant by embedded system let us know what is a SYSTEM, it is an arrangement in which all units assemble and work together according to the plan or program. Cont…

4. The first recognized modern embedded systems was the Apollo Guidance Computer, developed by Charles Stark Draper at the MIT Instrumentation Laboratory. DEFINITION: ' “An Embedded system is a system that has embedded software and computer hardware, which makes it a system dedicated for an application or a part of a larger system.”

5. DISADVANTAGES : EXISTING METHODS FOR FAULT DETECTION:  Parity Bits.  Check Sums.  Cryptographic Hash Functions.  Hamming Distance Code.  DO NOT FIND USE IN LARGE SCALE EMBEDDED SYSTEMS.  MOST OF THE ERRORS MAY BE DETECTED BUT ARE NOT CORRECTED.  MORE TIME COMPLEXITY

6. Upgraded Version For Error Detecting In Large Scale Embedded Systems By The Usage Of Sensors And Actuators. P ROPOSED MODEL : Sensors: It is a converter that measures a physical quantity and converts it into a signal which can be read by an observer or by an instrument. Actuators: It is a type of motor for moving or controlling a system. It is operated by a source of energy, usually in the form of an electric current, with some pressure and converts that energy into some kind of motion.

7. HOW IT WORKS ?? Simple Model Sensor with missing input fault

8. ABS SENSORS : ABS Sensors in vehicles Anti lock brake system sensor is a device that monitors the rotational velocity of a wheel on a car or truck.

9. APPLICATIONS:  Error free circuit.  Ruggedness in Design.  Real time responsiveness.  Impervious to external radiation.

10. C ONCLUSION :  Making system dependable must not be after - thought, it must be considered from the very beginning  This paper becomes a key technological component of all kinds of complex technical systems, ranging from vehicles, telephones, toys etc., To weapons,pace makers, manufacturing systems etc.,