A bar code laser scanner works by shining a bright light (laser light) at the barcode and measuring the reflected beam. In order to scan the entire barcode very quickly, the light is bounced off a spinning disk to cover the entire barcode in one pass.
Same as how the North Pole and South Pole works.
It works similar to how a photocopier scans a document. The reader uses a laser to scan a person's finger. It then compares the scan with a database of prints already stored on the computer. If the print matches - it allows access, if not - it rejects the potential user.
The fingerprint reader is a security feature that takes your fingerprint and stores it for sign on.
Barcode scanners begin by illuminating the code with red light. The sensor of the barcode scanner detects the reflected light from the illumination system and generates an analog signal with varying voltage that represent the intensity (or lack of intensity) of the reflection.
Input - the reader is reading the bar code and putting the information into the computer
your head
Different bar code readers can be installed using Google's Play Store. The store offers a wide range of bar code scanners such as "Bar code Scanner from ZXing Team or Google's own implementation of a qr/bar code reader : Google Goggles.
A code reader that will work on the OBD I system.
There's an app for that
bar code reader
There are several companies that make hand held bar code readers. You can even get an app for your smart phone that will read bar codes. A major manufacturer of bar code reader is Motorola (they bought "Symbol" the leading bar code reader company a while back). Look at: http://www.motorola.com/Business/US-EN/Business+Product+and+Services/Bar+Code+Scanning
Barcode Reader Because im guessing my answer
There are numerous advantages to the use of a bar code. The primary two are speed and accuracy. A bar code reader can decipher the code in just thousandths of a second and transmit it with near perfect accuracy - much better than humans can.
The bar code reader is used to read printed bar codes. It allows an attached computer to identify a product or item on which a bar code it printed and, most importantly, price that item to automate and speed checkout in a store or market.
A)mouseB)Barcode readerC)Optical Mark readerD) Printer
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