25-08-2017, 09:32 PM
An Embedded System employs a combination of hardware & software (a “computational engine”) to perform a specific function; is part of a larger system that may not be a “computer works in a reactive and time-constrained environment. Software is used for providing features and flexibility Hardware = {Processors, ASICs, Memory...} is used for performance (& sometimes security. An embedded system is a special purpose system in which the computer is completely encapsulated by the device it controls. Unlike a general purpose computer, such as a PC, an embedded system performs predefined task‟s usually with very specific tasks design engineers can optimize it reducing the size and cost of the product. Embedded systems are often mass produced, so the cost savings may be multiplied by million of items. The core of any embedded system is formed by one or several microprocessor or micro controller programmed to perform a small number of tasks. In contrast to a general purpose computer, which can run any software application, the user chooses, the software on an embedded sys
A tachometer is nothing but a simple electronic digital transducer. Normally, it is used for
measuring the speed of a rotating shaft. The number of revolutions per minute (rpm) is valuable information for understanding any rotational system. For example, there is an optimum speed for drilling a particular-size hole in a particular metal piece; there is an ideal sanding disk speed that depends on the material being finished. You may also want to measure the speed of fans you use. This easy-to-make photoelectric tachometer measures the rpm of most shop-floor tools and many household machines without any mechanical or electrical interface.