DESCRIBE THE PRINCIPLES OF OPERATION (HOW EACH DEVICE WORKS) OF THESE INPUT DEVICES:
2D AND 3D SCANNERS, BARCODE READERS, QUICK RESPONSE (QR) CODE READERS, DIGITAL
CAMERAS, KEYBOARDS, MICE, TOUCH SCREENS, INTERACTIVE WHITEBOARD, MICROPHONES
2D SCANNERS - THEY REFLECT LIGHT ONTO A PAGE, AND THEY GET THE COLOUR OF THE PAGES BASED ON THE REFLECTION.
3D SCANNERS - THEY SEND RADIATION ALL AROUND THE OBJECT, AND THEY CALCULATE THE TIME AND ENERGY LOST, WHICH GENERATES A 3D IMAGE.
BARCODE READERS - A LASER SHINES ON A PATTERN OF BLACK BARS, THE REFLECTION IS RECORDED AND INTERPRETED AS A UNIQUE NUMBER IN A DATABASE OF ITEMS AND THE CORRECT PRODUCT DETAILS ARE RETURNED.
QR CODE READERS - A CAMERA DETECTS THE QR CODE WHICH IS A BUNCH OF BLACK SQUARES ARRANGED ON A WHITE BACKGROUND. THE PATTERN IS RECOGNISED, WHICH CAN THEN REDIRECT USERS TO CERTAIN INFORMATION OR REDIRECT THEM TO A WEBSITE.
DIGITAL CAMERAS - THEY CAPTURE IMAGES AND LIGHT FROM THE PLACE YOU WANT TO TAKE ENTERS THE CAMERA WHEN YOU PRESS THE BUTTON, AND ENTERS LIGHT DETECTORS (CHARGE-COUPLED DEVICE), WHICH SPLITS THEM UP INTO PIXELS, PRODUCING THE IMAGE.
KEYBOARDS - KEYS AND LETTERS ARE ARRANGED IN A SECTION, AND WHEN YOU PRESS ON A KEY, A CIRCUIT IS COMPLETED, WHICH SENDS A SIGNAL TO A PROCESSOR WHICH DETERMINES WHICH LETTER YOU PRESSED. (IT USES AN ASCII TABLE).
MICE - MODERN MICE TAKE LOADS OF SMALL RESOLUTION IMAGES AND CAN RECOGNISE PATTERNS ON THE SURFACE, SO IT CAN DETECT THE DIRECTION OF THE MICE MOVEMENT. OLD MICE USE A BALL, THE MOUSE TRACKS THE BALL MOVEMENT AND INTERPRETS THE MOVEMENT.
TOUCH SCREENS - IT HAS THREE DIFFERENT TYPES, RESISTIVE, CAPACITATIVE AND INFRA-RED. ALL THREE METHODS DETECT INPUT IN DIFFERENT WAYS.
INTERACTIVE WHITEBOARD - ESSENTIALLY THE SAME AS TOUCH SCREENS, EXCEPT ON A MUCH LARGER SCALE.
MICROPHONES - USED TO INPUT SOUNDS, THE SOUND IS DETECTED BY THE DIAPHRAGM AND AN ELECTRICAL SIGNAL IS TRANSMITTED TO THE COMPUTER. SPECIAL HARDWARE IS USED FOR ANALOGUE TO DIGITAL CONVERSION AND DATA CAN BE STORED AND/OR MANIPULATED.
DESCRIBE HOW THESE PRINCIPLES ARE APPLIED TO REAL-LIFE SCENARIOS, FOR EXAMPLE: SCANNING OF PASSPORTS AT AIRPORTS, BARCODE READERS AT SUPERMARKET CHECKOUTS, AND TOUCH SCREENS ON MOBILE DEVICES
SCANNERS MIGHT BE USED IN AIRPORTS OR FOR DOMESTIC USE. BARCODE SCANNERS FOR SUPERMARKET FAST CHECKOUTS, TOUCH SCREENS FOR ENTERING DATA IN PUBLIC PLACES OR FOR PHONE USAGE.
DESCRIBE HOW A RANGE OF SENSORS CAN BE USED TO INPUT DATA INTO A COMPUTER SYSTEM, INCLUDING LIGHT, TEMPERATURE, MAGNETIC FIELD, GAS, PRESSURE, MOISTURE, HUMIDITY, PH AND MOTION
2D SCANNERS - THEY REFLECT LIGHT ONTO A PAGE, AND THEY GET THE COLOUR OF THE PAGES BASED ON THE REFLECTION.
3D SCANNERS - THEY SEND RADIATION ALL AROUND THE OBJECT, AND THEY CALCULATE THE TIME AND ENERGY LOST, WHICH GENERATES A 3D IMAGE.
BARCODE READERS - A LASER SHINES ON A PATTERN OF BLACK BARS, THE REFLECTION IS RECORDED AND INTERPRETED AS A UNIQUE NUMBER IN A DATABASE OF ITEMS AND THE CORRECT PRODUCT DETAILS ARE RETURNED.
QR CODE READERS - A CAMERA DETECTS THE QR CODE WHICH IS A BUNCH OF BLACK SQUARES ARRANGED ON A WHITE BACKGROUND. THE PATTERN IS RECOGNISED, WHICH CAN THEN REDIRECT USERS TO CERTAIN INFORMATION OR REDIRECT THEM TO A WEBSITE.
DIGITAL CAMERAS - THEY CAPTURE IMAGES AND LIGHT FROM THE PLACE YOU WANT TO TAKE ENTERS THE CAMERA WHEN YOU PRESS THE BUTTON, AND ENTERS LIGHT DETECTORS (CHARGE-COUPLED DEVICE), WHICH SPLITS THEM UP INTO PIXELS, PRODUCING THE IMAGE.
KEYBOARDS - KEYS AND LETTERS ARE ARRANGED IN A SECTION, AND WHEN YOU PRESS ON A KEY, A CIRCUIT IS COMPLETED, WHICH SENDS A SIGNAL TO A PROCESSOR WHICH DETERMINES WHICH LETTER YOU PRESSED. (IT USES AN ASCII TABLE).
MICE - MODERN MICE TAKE LOADS OF SMALL RESOLUTION IMAGES AND CAN RECOGNISE PATTERNS ON THE SURFACE, SO IT CAN DETECT THE DIRECTION OF THE MICE MOVEMENT. OLD MICE USE A BALL, THE MOUSE TRACKS THE BALL MOVEMENT AND INTERPRETS THE MOVEMENT.
TOUCH SCREENS - IT HAS THREE DIFFERENT TYPES, RESISTIVE, CAPACITATIVE AND INFRA-RED. ALL THREE METHODS DETECT INPUT IN DIFFERENT WAYS.
INTERACTIVE WHITEBOARD - ESSENTIALLY THE SAME AS TOUCH SCREENS, EXCEPT ON A MUCH LARGER SCALE.
MICROPHONES - USED TO INPUT SOUNDS, THE SOUND IS DETECTED BY THE DIAPHRAGM AND AN ELECTRICAL SIGNAL IS TRANSMITTED TO THE COMPUTER. SPECIAL HARDWARE IS USED FOR ANALOGUE TO DIGITAL CONVERSION AND DATA CAN BE STORED AND/OR MANIPULATED.
DESCRIBE HOW THESE PRINCIPLES ARE APPLIED TO REAL-LIFE SCENARIOS, FOR EXAMPLE: SCANNING OF PASSPORTS AT AIRPORTS, BARCODE READERS AT SUPERMARKET CHECKOUTS, AND TOUCH SCREENS ON MOBILE DEVICES
SCANNERS MIGHT BE USED IN AIRPORTS OR FOR DOMESTIC USE. BARCODE SCANNERS FOR SUPERMARKET FAST CHECKOUTS, TOUCH SCREENS FOR ENTERING DATA IN PUBLIC PLACES OR FOR PHONE USAGE.
DESCRIBE HOW A RANGE OF SENSORS CAN BE USED TO INPUT DATA INTO A COMPUTER SYSTEM, INCLUDING LIGHT, TEMPERATURE, MAGNETIC FIELD, GAS, PRESSURE, MOISTURE, HUMIDITY, PH AND MOTION
MANY SENSORS SUCH AS LIGHT, TEMPERATURE, MAGNETIC FIELD, GAS, PRESSURE, MOISTURE, HUMIDITY, PH AND MOTION SENSORS
MAY BE USED FOR DIFFERENT PURPOSES AND CAN BE INPUTTED INTO A COMPUTER SYSTEM. MOST OF THEM REQUIRE AN ADC
(ANALOGUE TO DIGITAL CONVERTER) AS MOST OF THEM ARE REAL DATA, AND HAS TO BE CONVERTED TO DIGITAL DATA FOR THE
COMPUTERS TO PROCESS.
DESCRIBE HOW THESE SENSORS ARE USED IN REAL-LIFE SCENARIOS, FOR EXAMPLE: STREET LIGHTS, SECURITY DEVICES, POLLUTION CONTROL, GAMES, AND HOUSEHOLD AND INDUSTRIAL APPLICATIONS
LIGHT SENSORS MAY BE FOR STREET LIGHTS. TEMPERATURE SENSORS FOR FERMENTERS. MAGNETIC FIELD SENSORS FOR NUCLEAR REACTORS (INDUSTRIAL USES). PRESSURE SENSORS FOR GAS RELATED ACTIVITIES (INDUSTRIAL USES). MOISTURE FOR MEASURING GENERAL HUMIDITY. PH FOR AGRICULTURAL USE (SOIL AND FERTILISERS). MOTION SENSORS FOR BURGLAR ALARMS (DOMESTIC).
DESCRIBE HOW THESE SENSORS ARE USED IN REAL-LIFE SCENARIOS, FOR EXAMPLE: STREET LIGHTS, SECURITY DEVICES, POLLUTION CONTROL, GAMES, AND HOUSEHOLD AND INDUSTRIAL APPLICATIONS
LIGHT SENSORS MAY BE FOR STREET LIGHTS. TEMPERATURE SENSORS FOR FERMENTERS. MAGNETIC FIELD SENSORS FOR NUCLEAR REACTORS (INDUSTRIAL USES). PRESSURE SENSORS FOR GAS RELATED ACTIVITIES (INDUSTRIAL USES). MOISTURE FOR MEASURING GENERAL HUMIDITY. PH FOR AGRICULTURAL USE (SOIL AND FERTILISERS). MOTION SENSORS FOR BURGLAR ALARMS (DOMESTIC).
0 coment�rios:
Post a Comment