After shopping at the supermarket, he lined up. He takes the items he bought from the table one by one. The dealer at the counter is scanning his inventory. A 'beep' as soon as the chip pack is pressed. At the same time, all the information is floating on the screen of the next computer monitor. Although the computer makes a receipt for each product, how much it costs, how much VAT, the supermarket also keeps track of the number of updated products.
This barcode scanner is now used in many stores both domestically and internationally. These scanners can easily retrieve product information even if the barcodes are slightly broken, cracked, or distorted. Although barcode readers work differently, the technology behind them is almost the same.
Barcode scanners work in three steps. Lighting systems, sensors and actuators. Light from a specific source is projected onto the barcode. From there the light bounces back to the scanner and the sensor can detect them.
Laser scanners emit a specific level of light. Which appears on the barcode and then back to the barcode with the help of the mirror. This is why a light beam is generated as soon as the scan is taken. Then the light from the product barcode space falls on another mirror. From where the sensor can generate the necessary digital and analog information. Which is then automatically added to the computer's database.
The Universal Product Code (UPC) is the most widely used in the world. This 95 column black and white code is the most secure. When this barcode is scanned, the computer generates 95 numbers in 15 segments. First, the end and middle are placed in certain groups so that the computer understands that the barcode is read from left to right or from top to bottom.
The number at the far left of the barcode indicates the type. The 5 numbers on the front panel indicate the number of elements. And the 5 numbers in the second part show the marketing number of the product. The last digit to the right indicates the 'check digit'. So that the computer knows that the scanner has correctly read the barcode.