The use of the 1602 character LCD module is very wide, and "1 various LCD manufacturers to provide the liquid crystal, are almost all the same specification 1602 module or compatible module, even if their product name is different. The 1602Icd is a 16-by-2 display that can display two lines of seven short 16-character LCD modules (display characters and Numbers).1602 character LCD LCD module, the original use of the LCD controller is HD44780, in the market production of 1602 LCD module, basically also adopted the control IC which is compatible with it, so from the characteristics are basically the same; Of course, many 丿 dealer provide different characters such as color, backlight color display modules' [2].The specifications of the 1602 unit commonly seen are as follows: