![]() 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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January 2023
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