What is BAR CODE ?

A barcode is a machine-readable representation of data in a visual form. It consists of parallel lines and spaces of varying widths that encode information. Barcodes are widely used for automatic identification and data capture purposes. They come in various formats, including linear (1D) barcodes and two-dimensional (2D) barcodes.

1. **Linear Barcodes (1D):** These are the traditional barcodes with parallel lines of varying thickness. Examples include UPC (Universal Product Code) and EAN (European Article Number) used on retail products.

2. **2D Barcodes:** These barcodes use a two-dimensional arrangement of squares, dots, or other geometric patterns to encode data. QR codes (Quick Response) are a common example of 2D barcodes.

Barcodes are scanned by barcode readers or scanners, which interpret the encoded information and transmit it to a computer or other data processing system. They are extensively used in various industries for tasks like product identification, inventory management, and facilitating quick data entry.

BAR Code Readers.

A barcode reader, also known as a barcode scanner, is a device that uses optical sensors to capture and read information from barcodes. Barcodes are visual representations of data in a machine-readable form, typically consisting of parallel lines and spaces of varying widths. The barcode reader scans the barcode, converts the visual information into digital data, and then interprets the encoded information, such as product details or inventory numbers. These devices are widely used in retail, logistics, and various industries for efficient data capture and management.

How The BAR CODE System Works?

Barcode scanners use a combination of light sensors, lenses, and decoding algorithms to read barcodes. Here's a simplified explanation of how they work:

1. **Illumination:** The scanner emits a beam of light onto the barcode. This light reflects off the contrasting bars and spaces of the barcode.

2. **Reflection:** The reflected light is captured by light sensors in the barcode scanner. The differences in light intensity between the dark bars and light spaces are detected.

3. **Conversion to Electrical Signal:** The captured light pattern is converted into an electrical signal by the sensors. This signal represents the varying widths of the bars and spaces.

4. **Analog-to-Digital Conversion:** The analog signal is converted into a digital signal, creating a digital representation of the barcode.

5. **Decoding:** The digital information is then decoded using specialized algorithms in the barcode scanner. This process translates the pattern of bars and spaces into the encoded data, such as numbers or alphanumeric characters.

6. **Output:** Finally, the decoded information is sent to a connected device, such as a computer or point-of-sale system, to process and utilize the data for inventory management, sales transactions, or other applications.

In essence, barcode scanners automate the process of data entry by quickly and accurately capturing information from barcodes, improving efficiency and reducing the likelihood of human error.