![]() As the Arduino is communicating with the display using SPI, pin 11 & 12 will change depending on what board you are using. Note that this circuit was originally designed for the Arduino UNO. pin headers to solder to the LCD display pins.LCD Screen (compatible with Hitachi HD44780 driver).For displaying text on the screen, you can do most everything in 4-bit mode, so example shows how to control a 16x2 LCD in 4-bit mode. ![]() The 4-bit mode requires seven I/O pins from the Arduino, while the 8-bit mode requires 11 pins. The Hitachi-compatible LCDs can be controlled in two modes: 4-bit or 8-bit. The LiquidCrystal Library simplifies this for you so you don't need to know the low-level instructions. The process of controlling the display involves putting the data that form the image of what you want to display into the data registers, then putting instructions in the instruction register. ![]() There's also a display contrast pin (Vo), power supply pins (+5V and GND) and LED Backlight (Bklt+ and BKlt-) pins that you can use to power the LCD, control the display contrast, and turn on and off the LED backlight, respectively. The states of these pins (high or low) are the bits that you're writing to a register when you write, or the values you're reading when you read.
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