Introduction
It is so important to see visual data on a screen when the programmer is setting up his Arduino Uno project. The Article LCD 16X2 Arduino Uno projects explain the way to do this with Arduino Uno Board.
What is an LCD ?
An LCD, or Liquid Crystal Display, is a flat panel display that uses the light-modulating properties of liquid crystals to produce images.
LCDs are used in various applications, from traditional TV sets and computer monitors to digital cameras and mobile phones.
Types of LCDs:
The LCD is the most common type of display today. It has many different styles, and each type has its advantages and disadvantages.
Types of LCDs:
Transmissive LCDs
Transmissive LCDs are the most common LCD type today. They are also known as backlit or active matrix displays because they use a matrix of light to create an image on a screen by shining light through liquid crystals.
One disadvantage is that they have a lower refresh rate, which means images may be blurry when moving quickly.
Transflective LCDs:
Transflective LCDs are like transmissive LCDs, but they can be used in sunlight without increasing the brightness of the screen, which means that you can still see what you’re doing outside, even if it’s sunny.
Arduino library for HD44780 driver
This Arduino library is written to work with the HD44780 driver.The HD44780 is a standard LCD driver found in many LCD modules. This library allows you to use the HD44780 driver with an Arduino board easily.
The library provides functions for writing text, drawing shapes and lines, and setting the cursor position on the screen. It also includes a process for setting up the pins on your Arduino board to match those of your module.
If you are using a different type of LCD module, this library might not be what you are looking for.The Arduino library for the HD44780 driver is a library that is used to control the HD44780 16×2 LCD. It can be used with any of the Arduino boards.
This library is compatible with the following boards:
- Arduino Uno
- Arduino Leonardo
- Arduino Mega 2560
- Arduino Due
- Arduino Mega ADK
LCD 16×2 Arduino
The LCD 16X2 Arduino is an electronic device that is used to show the data. The device is used in many home appliances, cars, remote control, and many more applications.
The LCD 16X2 Arduino consists of two rows and sixteen columns of pixels. The first row has sixteen pixels, and the second row has sixteen pixels. The pixel size is normally measured in millimeters.
The purpose of the Arduino LCD 16×2
The Arduino LCD 16×2 is a device that has a 16-character by 2-line LCD screen. The Arduino can be programmed to display any message on the screen.
The Arduino LCD 16×2 provides an easy way for you to add a display to your project.
It also has a built-in menu system that makes it easy for you to control various settings like text size, color, and contrast. It has been tested with Arduino Uno R3, Arduino Mega 2560 R3, and Arduino Mega 1280.
Arduino LCD interface connection
The Arduino LCD interface connection will allow you to connect an LCD screen to your Arduino board.
Consequently, it is essential to know how to wire up an LCD screen for use with an Arduino board to take advantage of its different features and functionalities.
The Arduino LCD interface connection has three pins: ground (GND), power (VCC), and data (SDA). The GND connects to the GND on the board, VCC connects to the 5V pin on the board, and SDA connects to one of the I2C pins on the board.You will need to connect the 5V and GND pins from the Arduino board, the contrast pin, and four data lines. The 5V pin will supply power for the LCD screen and ensure it stays on, while GND will provide a ground for both devices.
The contrast pin controls how bright or dim your display is, so you want it set at a medium level for this tutorial. And finally, we have four data pins responsible for sending information from the Arduino board to our display.
Arduino LCD libraries
Arduino LCD libraries are a great way to make your Arduino project have a user interface. These libraries make adding text, numbers, and graphics to the screen more manageable.
These Arduino libraries can be used with the Arduino IDE. They are available in various programming languages such as C++, Python, and Java.Arduino library for HD44780 driver
Adjusting the contrast of Arduino LCD
Adjusting the contrast of the Arduino LCD can be done in two ways. One is by changing the contrast potentiometer, and the other is by adjusting the voltage.
Adjusting the contrast potentiometer
The potentiometer can be adjusted from 0 to 255.
2) Adjusting voltage
The Arduino sketch needs to be modified to write values for both the brightness and contrast.
Connecting the LCD Screen to the Potentiometer
We need three jumper wires to connect the LCD screen with the potentiometer.
Connect one wire from the Arduino 5V pin to the VCC pin on the LCD screen or an external 5V power supply.Connect the GND of the Arduino board to the GND of the LCD. Connect the VO of the LCD to the potentiometer to control the contrast of the image. Adjust the potentiometer until the picture becomes clear.
Connect the RS LCD pin to the digital pin of the Arduino. We will control the memory of the LCD with an RS pin.
Connect the R/W LCD PIN to the GRD of the Arduino Uno board; switch between the read and the write mode of the Arduino Uno and the LCD.
Connect the E pin of the LCD to the digital pin of the Arduino Uno Board. The E pin enables writing to the register of the LCD.
Connect the data pins from D0 to D7 to the digital pin of the Arduino Uno board. The data pins control the writing on the LCD.
Take note
The LCD has two pin modes: four-pin mode and eight-pin mode.
LCD 4 pin mode
LCD 4 pin mode is a mode that LCD modules can be set to. It is often used in the development stages of an LCD project.
This allows developers to test their code without using an expensive, complicated, and time-consuming setup.
LCD 8 pin mode
LCD 8 pin mode is a mode used for more complicated Arduino projects.Connect the LED+ LCD pin to the Arduino 5V pin.Connect the LED- LCD pin to the Arduino GRD pin.
Take note
The LED+ is the anode of the LCD backlight led.The LED- is the cathode of the LCD backlight led.
Arduino Uno 16X2 LCD project
On-LCD text project
The hardware required for the project
Arduino Uno board BreadboardLCD 16X210-ohm Potentiometer220-ohm resistor for the backlight of the LCD
The code of the project
// C++ code# include <LiquidCrystal.h>/*The pins are ordered from left to right(RS,E,D4,D5,D6,D7)*/LiquidCrystal lcdDisplay(12,11,4,5,6,7);void setup(){lcdDisplay.begin(16,2);lcdDisplay.print(” LCD screen ON”);}void loop(){}
Display and clean a text from 16X2 LCD
The hardware required for the project
Arduino Uno board BreadboardLCD 16X210-ohm Potentiometer220-ohm resistor for the backlight of the LCD
Description of the project
We will add a function to clear what we printed on the screen using the following function lcdDisplay.clear();
The code of the project
// C++ code# include <LiquidCrystal.h>/*The pins are ordered from left to right(RS,E,D4,D5,D6,D7)*/LiquidCrystal lcdDisplay(12,11,4,5,6,7);void setup(){lcdDisplay.begin(16,2);lcdDisplay.print(” LCD screen ON”);}void loop(){delay(800);// Clean th screenlcdDisplay.clear();// Print a word on the Arduino LCDlcdDisplay.print(” Starter “);delay(800);lcdDisplay.clear();lcdDisplay.print(” DC “);delay(800);lcdDisplay.clear();lcdDisplay.print(” Motor”);delay(800);lcdDisplay.clear();lcdDisplay.print(” Arduino Uno “);delay(800);lcdDisplay.clear();lcdDisplay.print(” Project “);delay(800);lcdDisplay.clear();lcdDisplay.print(” full-skills.com”);delay(800);}
Display a text in a special place on a 16X2 LCD
The hardware required for the project
Arduino Uno board BreadboardLCD 16X210-ohm Potentiometer220-ohm resistor for the backlight of the LCD
Description of the project
In the following section, we will change the position of the letters on the LCD Arduino screen.
The code of the project
// C++ code# include <LiquidCrystal.h>/*The pins are ordered from left to right(RS,E,D4,D5,D6,D7)*/LiquidCrystal lcdDisplay(12,11,4,5,6,7);void setup(){lcdDisplay.begin(16,2);lcdDisplay.print(” LCD screen ON”);}void loop(){delay(800);lcdDisplay.clear();lcdDisplay.setCursor(1,0);lcdDisplay.print(“Starter “);delay(800);lcdDisplay.clear();lcdDisplay.setCursor(2,0);lcdDisplay.print(“DC”);delay(800);lcdDisplay.clear();lcdDisplay.setCursor(3,0);lcdDisplay.print(“Motor”);delay(800);lcdDisplay.clear();lcdDisplay.setCursor(4,0);lcdDisplay.print(“Arduino Uno”);delay(800);lcdDisplay.clear();lcdDisplay.setCursor(5,0);lcdDisplay.print(“Project”);delay(800);lcdDisplay.clear();lcdDisplay.setCursor(0,0);lcdDisplay.print(“full-skills.com”);delay(800);lcdDisplay.clear();lcdDisplay.setCursor(1,1);lcdDisplay.print(“full-skills.com”);delay(800);lcdDisplay.clear();lcdDisplay.setCursor(1,0);lcdDisplay.print(“full-skills.com”);delay(800);lcdDisplay.clear();lcdDisplay.setCursor(0,1);lcdDisplay.print(“full-skills.com”);delay(800);}
Conclusion
The Arduino LCD 16X2 is an essential hardware Arduino starter kit component that serves to display data to the user after making the correct code with the Arduino board. The user can link the 6×2 LCD to the Arduino Uno board.
