can you explain the connection of LCD
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Insert your LCD screen into your breadboard vertically such that each pin has its own separate line on the board. Insert your potentiometer in the same way. Connect 5v and GND from Arduino to the + / - rails on your breadboard. This will ground your Backlight and LCD.
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The LCDs have a parallel interface, meaning that the microcontroller has to manipulate several interface pins at once to control the display. The interface consists of the following pins: A register select (RS) pin that controls where in the LCD's memory you're writing data to.
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