Revision

Revision

1. sensors

   • It is common for stores to have a beam of light crossing the room near the door
     • this is the sensor for the automatic door to open
   • house alarms
     • a light will flash when it detects that someone is in the room
       • the alarm then goes off, warning the person who lives there
   • The same thing can be done with ultrasonic sound waves, bouncing them off a target and waiting for the echo.

2. barcodes

   • once it is run through the scanner the computer picks up the barcode
     • it reads through the lines
       • The numbers at the bottom of a UPC label are for humans only.
         • It helps keep the pricing more accurate
           • It also helps a company know exactly how much of an item they have in stock or when they run out of an item

3. encoding

   • encoding is giving a certain product whether it be size, clour, what it is, genre (If music) ect a shortened code even though poeple will still know what it is
   • For example- Green Could Be GRN or Extra Small Could be XS
   • This method is used my shops (Food and clothes), Sports programmes, anything that can be shortened.