Introduction: Lcd Interfacing With Arduino

By Alpha Electronz
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In this tutorial we are going to interface LCD 16X2 with Arduino Uno and display the most famous “Hello World!” Text on the LCD.

Components Required LCD 16X2 – (Checkout)Arduino Uno – (Checkout)Variable Resistor Aka Preset – (Checkout)Breadboard and Jumper – (Checkout)LCD 16X2

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. You can select either the data register, which holds what goes on the screen, or an instruction register, which is where the LCD’s controller looks for instructions on what to do next. A Read/Write (R/W) pin that selects reading mode or writing mode An Enable pin that enables writing to the registers 8 data pins (D0 -D7). 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. There’s also a display constrast 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 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. The LiquidCrystal Library simplifies this for you so you don’t need to know the low-level instructions. The Hitachi-compatible LCDs can be controlled in two modes: 4-bit or 8-bit. The 4-bit mode requires seven I/O pins from the Arduino, while the 8-bit mode requires 11 pins. For displaying text on the screen, you can do most everything in 4-bit mode, so example shows how to control a 16×2 LCD in 4-bit mode. Circuit Diagram To wire your LCD screen to your board, connect the following pins: LCD RS pin to digital pin 2LCD Enable pin to digital pin 3LCD D4 pin to digital pin 4LCD D5 pin to digital pin 5LCD D6 pin to digital pin 6LCD D7 pin to digital pin 7Additionally, wire a 10k pot to +5V and GND, with it’s wiper (output) to LCD screens VO pin (pin3).

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