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Main Components of the Computer System Computer Computer is an electronic device which can be used to input, process, output, store and retrieve data, Information and instructions.
Computer System 1. Hardware (දෘඩ ාංග) 2. Software (මෘදුක ාංග) 3. Firmware (ව්ථිර ාංග) 4. Live ware (ජීල ාංග)
Hardware Physical component of a computer system called hardware.
Classification of computer hardware
1. 2. 3. 4.
Input Device (ආද න උප ාංග) Output Device (ප්රනථිද න උප ාංග) Storage Device (ආචයන උප ාංග) Processing Unit (වකවනය)
Input Device 1. 2. 3. 4. 5. 6. 7. 8. 9.
Keyboard Mouse Microphone Web Camera Digital Camera Video Camera Joystick (මමමශයුම් යටිය) Light Pen (ආමෝක පෑන) Pen Input Drive (පෑන් ආද න)(for PDA)(To recognized the hand writing)
10. 11. 12. 13. 14. 15. 16. 17.
Touch Screen (ව්පර් තිරය)(ATM, Phone… Touch Pad (ව්පර් පුලරැල) Track Ball (ම ර්ග ගු ල) Scanner (සුපරීක්ණය) Bar Code Reader (තීරැ මක්ත කියලනය) Magnetic Strip Reader( චුම්බකිත තීරැ කියලනය) Sensor Graphic Tablet
Pointing Devices 1. 2. 3. 4. 5. 6. 7. 8.
Mouse Joystick Light pen Touch Screen Touch Pad Track Ball Pen Input Device Graphic Tablet
Keyboard
Optical Mouse
Mechanical Mouse
Microphone
Film Camera is not an input device
Web camera
Digital Camera
Video Camera
Joystick
Light Pen
Touch pad/Touch Screen
Track Ball
Tablet
Scanner 1. Optical Character Recognition – OCR 2. Magnetic Ink Character Recognition – MICR
3. Optical Mark Reader – OMR
Optical Character Recognition – OCR
Magnetic Ink Character Recognition - MICR
Magnetic Ink Character Recognition, or MICR, is a character recognition technology used primarily by the banking industry to facilitate the processing of cheques and makes up the routing number and account number at the bottom of a cheque. The technology allows computers to read information (such as account numbers) off printed documents. Unlike barcodes or similar technologies, however, MICR codes can be easily read by humans. MICR characters are printed in special typefaces with a magnetic ink or toner, usually containing iron oxide. As a machine decodes the MICR text, it first magnetizes the characters in the plane of the paper. Then the characters are passed over a MICR read head, a device similar to the playback head of a tape recorder. As each character passes over the head it produces a unique waveform that can be easily identified by the system.
Optical Mark Reader - OMR
Optical Mark Reader(OMR Scanner) is a high-tech data input device. OMR Scanner can be widely used in education examinations, signing up, subject choice, data statistics and evaluation in fields such as vote, transportation, human resources, fiscal taxation and finance and so on.
Barcode Reader
Magnetic stripe reader
A magnetic stripe reader, also called a magstripe reader, is a hardware device that reads the information encoded in the magnetic stripe located on the back of a plastic badge. Eg:-Credit Card Magnetic stripe readers can be read by a computer program through a serial port , USB connection, or keyboard wedge , and are generally categorized by the way they read a badge. For instance, insertion readers require that the badge be inserted into the reader and then pulled out. Swipe readers require that the badge pass completely through the reader.
Sensor and Loggers
One portable multi-channel data logger for temperature, humidity, pressure, ac current, voltage, and more - no external power required.
Data logger From Wikipedia, the free encyclopedia Jump to: navigation, search
Data logger Cube storing technical and sensor data A data logger (also datalogger or data recorder) is an electronic device that records data over time or in relation to location either with a built in instrument or sensor or via external instruments and sensors. Increasingly, but not entirely, they are based on a digital processor (or computer). They generally are small, battery powered, portable, and equipped with a microprocessor, internal memory for data storage, and sensors. Some data loggers interface with a personal computer and utilize software to activate the data logger and view and analyze the collected data, while others have a local interface device (keypad, LCD) and can be used as a stand-alone device. Data loggers vary between general purpose types for a range of measurement applications to very specific devices for measuring in one environment or application type only. It is common for general purpose types to be programmable; however, many remain as static machines with only a limited number or no changeable parameters. Electronic dataloggers have replaced chart recorder in many applications.
One of the primary benefits of using data loggers is the ability to automatically collect data on a 24-hour basis. Upon activation, data loggers are typically deployed and left unattended to measure and record information for the duration of the monitoring period. This allows for a comprehensive, accurate picture of the environmental conditions being monitored, such as air temperature and relative humidity. The cost of data loggers has been declining over the years as technology improves and costs are reduced. Simple single channel data loggers cost as little as $25. More complicated loggers may costs hundreds or thousands of dollars.
Output Device 1. Monitor 2. Printer 3. Speaker
Monitor Quality of picture measured by “Resolution”.(ppi) 1. Cathode Ray Tube – CRT 2. Liquid Crystal Display – LCD 3. Light Emit Diode – LED Cathode Ray Tube – CRT
Liquid Crystal Display - LCD
Light Emit Diode – LED
Comparison of CRT and LCD CRT Size Power Consumption Price External Magnetic Field Viewing Angle Response Time
LCD
Printer (speed – ppm/ Pages per minute )
Impact Printer Non Impact Printer
Impact Printer 1. Dot Matrix Printer 2. Daisy Wheel Printer 3. Line Printer Daisy Wheel Printer
Dot Matrix Printer
Line Printer
Non-Impact Printers Ink Jet Printer Bubble jet printer Laser printer Dye Sublimation Printer Thermal printer Plotter
Ink Jet Printer
Laser Printer
Thermal Printer
Dye Sublimation Printer
Plotter
Use Cartridge Computer Aided Design
