Crystal Display Liquid, short for LCD. It is a current to stimulate the liquid crystal molecules produce dots, lines, and the back light tube constitute a picture. It is commonly referred to as LCD directly to LCD. This 1602 LCD, each line of 16 characters, a total of 2 lines, parallel interfaces, new . The utility model has the advantages of small volume, low power consumption, display has the advantages of simple operation, but not necessary product for wheeled robot, or Arduino interactive interface, and the most direct equipment.