LiquidCrystal()DescriptionCreates a variable of type LiquidCrystal. The display can be controlled using 4 or 8 data lines. If the former, omit the pin numbers for d0 to d3 and leave those lines unconnected. The RW pin can be tied to ground instead of connected to a pin on the Arduino; if so, omit it from this function's parameters.
#include <LiquidCrystal.h> // include the library code:LiquidCrystal lcd(8, 9, 4, 5, 6, 7); // initialize the library with the numbers of the interface pins
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