The standard 16X2 character liquid crystal display module (yellow and green backlight display screen) The standard 16 pin interface as 1602: First pin: VSS ground power supply Second pin: VDD connects 5V positive power Third pin: V0 is LCD contrast adjusting end, it is the weakest contrast degree when connected with the positive power, the highest when connected with ground power supply, when contrast degree is too high will produce a “ghost shadow”. you can use a 10K potentiometer to adjust contrast degree. Fourth pin: RS is for register selection. Select data register in high electric level, select instruction register in low electric level. Fifth pin: R/W is read and write signal line, reading operation in high electric level, writing operation in low electric level. When RS and RW are both in low can be written instructions or display address, when RS is in low and RW is in high level can be read as busy signal, when the RS is high and RW is low can write data. Sixth pin: E terminal is enable terminal, when the E terminal becomes low from high electric level, the LCD module to execute a command. Seventh ~ fourteenth pin: D0 ~ D7 is 8 bit bidirectional data line. Fifteenth pin: backlight positive power Sixteenth pin: backlight negative power
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