Glass size: 69.5*21.8*17.8 Blue background, white text 1602 a standard 16-pin interfaces, including: 1th pin: VSS power 2nd pin: VDD 5V power supply 3rd pin: V0 for liquid crystal display contrast adjustment side, contrast when the weakest are power supply, grounding power the greatest contrast, contrast is too high will have a “ghosting”, can be used by a 10K potentiometer to adjust the contrast 4th pin: RS to register options, select a data register, high level low level select the instruction register 5th pin: r/w for read/write signal lines, high voltage for read operations, to write low level. When RS and RW work for low level address can be written instructions or, as RS for low-level RW for high level can be read off busy signals, when RS RW high level to low level data can be written. 6th pin: e end-for-end, when e duanyou-level jumps to a low level, LCD module executes the command. Di7~14 v: D0~D7 for 8-bit bidirectional data line. 15th pin: backlight power supply cathode 16th pin: backlight power supply negative pole