2 pin is for VDD take 5 V is power
then when the power is the weakest contrast, grounding the power supply highest contrast, high contrast can produce the “ghost”, when used, can pass a 10 K adjust potentiometer contrast
5th pin is for R/W signal lines for reading and writing. it is high electricity usually is read operation. it is low electricity at ordinary times for write operation.
6th pin is for E end to make an end, when E is driven by the high-level jump into low electricity at ordinary times, LCD module executive order.
15 feet is backlighting power positive
LCD 16X2 1602 Blue Color is very useful for electronics students and project makers.
