Interfacing Arduino with LCD (Liquid Crystal Display)

Djerourou Akram

Interfacing Arduino with LCD (Liquid Crystal Display)

Hello friends 👋👋welcome back again to Arduino Tutorial Course in today blog we are going to explore together the Liquid Crystal Display or also known by LCD which is one of the most common parts on all electronics and DIY projects we will dive into their architecture working principal and how to interface it with Arduino Uno.

LCD Pinout and architecture:

We will work with 16×2 display first we will explore the Pinout:

Pin Number

Symbol

Description

1

VSS

Ground

2

VDD

5V power Supply

3

VO

Contrast Adjustment

4

RS

Register Select

5

RW

Read/Write Mode Selection

6

E

 

Enable Pin

7

D0

Data Pin 0 (Least Significant Bit)

8

D1

Data Pin 1

9

D2

Data Pin 2

10

D3

Data Pin 3

11

D4

Data Pin 4

12

D5

Data Pin 5

13

D6

Data Pin 6

14

D7

Data Pin 7 (Most Significant Bit)

15

A

LED Anode (Backlight +)

16

K

LED Cathode (Backlight -)


What features offers LCD:

LCDs have several features that make them popular in electronic projects:

  1. Low Power Consumption: LCDs consume less power compared to other display types like LED and OLED.
  2. Clear Display: They provide a clear and sharp display for both characters and simple graphics.
  3. Variety of Sizes: LCDs come in various sizes, typically ranging from 16x2 (16 characters per line and 2 lines) to larger sizes like 20x4.
  4. Ease of Use: They are relatively easy to interface with microcontrollers, including Arduino.

Interfacing LCD with Arduino Uno:

In order to interface LCD with Arduino uno we need to setup the hardware and software configuration, first we will begin by the hardware setup

 Required hardware:

  • Arduino Uno
  • 16x2 LCD
  • Potentiometer (for contrast adjustment) 
  • Resistors
  • Jumper wires
  •  Breadboard 

Wiring instruction:

 Connect Pin to :

  •         LCD VSS to GND
  •      LCD VDD to 5V
  •      LCD VO to the potentiometer
  •      Potentiometer ends to 5V and GND
  •      LCD RS to Arduino digital pin 12
  •      LCD RW to GND
  •      LCD E to Arduino digital pin 11
  •      LCD D4 to Arduino digital pin 5
  •      LCD D5 to Arduino digital pin 4
  •   LCD D6 to Arduino digital pin 3
  •   LCD D7 to Arduino digital pin 2
  •   LCD A (LED Anode) to 5V (with a 220-ohm resistor)
  •   LCD K (LED Cathode) to GND

Adjusting the Contrast :

The potentiometer connected to pin VO of the LCD allows you to adjust the contrast of the display. Rotate the potentiometer until you can see the characters clearly.

The wiring diagram and the schematics are done on TinkerCad platform are shown below:

Arduino with LCD interface

Arduino interfacing with LCD Schematics




Software Setup:

Now that we have our LCD connected to the Arduino, let's write the code that display some text. We are going to use the Liquid Crystal library which is available on Arduino IDE library , then we intiliase pins configuration on the begining of the code ,after that we prepare the LCD to display some text the arduino code is given in below :


Arduino code for LCD


the simulation file contain the circuit, code and schematics is given on TinkerCad platform with the link Below:

👉 https://www.tinkercad.com/things/1hlPsswnEoP-liquid-crystal-display 👈

Interfacing an LCD with Arduino is a straightforward process that opens up a wide range of possibilities for your projects. From simple text displays to more complex menus and data visualization, LCDs can enhance the functionality and user interaction of your designs. By following the wiring and code examples provided in this post, you can start experimenting with LCDs and create some exciting projects.

Stay connects with us for more Arduino tutorials and projects enjoy with coding Arduino 😄😄

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