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Pedro Gallegos
Pedro Gallegos

How to use LiquidCrystal_I2C library with ESP8266 and Arduino boards


LiquidCrystal_I2C LCD(0x27 16 2) Library Download




If you want to display some text or numbers on a small screen, you might want to use a character LCD. A character LCD is a type of LCD that can display only characters, not graphics. It is ideal for displaying information such as messages, menus, sensor data, etc.


However, wiring a character LCD to an Arduino can be complicated and messy. You need to connect many pins and use a potentiometer to adjust the contrast. That's why using an I2C LCD is a better option. An I2C LCD is a character LCD that uses an I2C interface to communicate with Arduino. It simplifies the wiring and makes the code easier.




liquidcrystal_i2c lcd(0x27 16 2) library download



In this article, we will show you how to download and install the liquidcrystal_i2c lcd(0x27 16 2) library, which is a library for controlling I2C LCD displays with Arduino. We will also show you how to use the library to display text and numbers on the LCD. Finally, we will give you some examples and applications of using the I2C LCD in your projects.


How to download and install the library




The liquidcrystal_i2c lcd(0x27 16 2) library is a library that allows you to control I2C LCD displays with functions similar to the LiquidCrystal library. It supports different sizes of LCDs, such as 16x2, 20x4, etc. It also allows you to adjust the backlight, create custom characters, scroll text, and more.


To download and install the library, follow these steps:


  • Click to download the liquidcrystal_i2c lcd(0x27 16 2) library from GitHub.



  • You should have a .zip folder in your Downloads folder. Unzip the folder and rename it from LiquidCrystal_I2C-master to LiquidCrystal_I2C.



  • Move the LiquidCrystal_I2C folder to your Arduino IDE installation libraries folder.



  • Re-open your Arduino IDE.



How to use the library




After installing the library, you can use it in your sketches. Here are some steps to follow:


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liquidcrystal_i2c lcd(0x27,16,4) library download (for a different size of LCD)


esp8266 liquidcrystal_i2c lcd(0x27,16,4) library download (for a different microcontroller)


arduino uno liquidcrystal_i2c lcd(0x27,20,4) library download (for a different size and microcontroller)


arduino mega2560 liquidcrystal_i2c lcd(0x3f,20,4) library download (for a different size, address and microcontroller)


arduino nano iic/iC/twi serial LCD module shield (for a different module)


arduino nano iic/iC/twi serial LCD module shield tutorial (for a tutorial on the module)


arduino nano iic/iC/twi serial LCD module shield wiring (for the wiring of the module)


arduino nano iic/iC/twi serial LCD module shield code (for the code of the module)


arduino nano iic/iC/twi serial LCD module shield example (for an example of the module)


arduino nano iic/iC/twi serial LCD module shield install (for the installation of the module)


arduino nano iic/iC/twi serial LCD module shield github (for the github of the module)


arduino nano iic/iC/twi serial LCD module shield reference (for the reference of the module)


arduino nano iic/iC/twi serial LCD module shield documentation (for the documentation of the module)


arduino nano iic/iC/twi serial LCD module shield zip (for the zip file of the module)


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How to wire the LCD to Arduino




The I2C LCD has four pins: GND, VCC, SDA, and SCL. GND is the ground pin, VCC is the power supply pin, SDA is the data signal pin, and SCL is the clock signal pin. You need to connect these pins to your Arduino board as follows:


I2C LCDArduino Uno/NanoArduino Mega


GNDGNDGND


VCC5V5V


SDAA420


SCLA521


How to include the library and declare an object




To use the liquidcrystal_i2c lcd(0x27 16 2) library in your sketch, you need to include it at the beginning of your code:


#include #include


Then, you need to declare an object of the LiquidCrystal_I2C class. The object represents your LCD display and allows you to control it. To declare the object, you need to specify three parameters: the I2C address of the LCD, the number of columns, and the number of rows. For example, if you have a 16x2 LCD with an I2C address of 0x27, you can declare the object as follows:


LiquidCrystal_I2C lcd(0x27, 16, 2);


You can find the I2C address of your LCD by using an I2C scanner sketch. You can download it from .


How to initialize, control, and print on the LCD




After declaring the object, you need to initialize it in the setup() function. To do that, you need to call the begin() method of the object. This method initializes the LCD and sets the cursor position to the top left corner. For example:


void setup() lcd.begin();


To control the LCD, you can use various methods of the object. Some of the most common methods are:


  • backlight() and noBacklight(): These methods turn on and off the backlight of the LCD.



  • clear(): This method clears the display and sets the cursor position to the top left corner.



  • setCursor(col, row): This method sets the cursor position to the specified column and row.



  • createChar(num, data): This method creates a custom character with a given number (0 to 7) and an array of bytes that define its shape.



  • write(num): This method writes a custom character with a given number (0 to 7) to the LCD.



  • scrollDisplayLeft() and scrollDisplayRight(): These methods scroll the display one position to the left or right.



To print text or numbers on the LCD, you can use the print() or println() methods of the object. These methods work similarly to the Serial.print() or Serial.println() methods. You can print strings, characters, integers, floats, etc. For example:


void loop() lcd.print("Hello World!"); lcd.setCursor(0, 1); lcd.print("Temperature: "); lcd.print(25.6); lcd.print(" C");


This code will print "Hello World!" on the first line and "Temperature: 25.6 C" on the second line of the LCD.


Examples and applications




Now that you know how to use the liquidcrystal_i2c lcd(0x27 16 2) library, let's see some examples and applications of using it in your projects.


Basic example: Hello World




This is a simple example that shows how to use the library to display "Hello World!" on a 16x2 I2C LCD. You will need an Arduino board, an I2C LCD, and some jumper wires.


The wiring is as follows:


I2C LCDArduino Uno/Nano


GNDGND


VCC5V


SDAA4


SCLA5


The code is as follows:


#include


// Declare an object of LiquidCrystal_I2C class LiquidCrystal_I2C lcd(0x27, 16, 2); void setup() // Initialize the LCD lcd.begin(); // Turn on the backlight lcd.backlight(); // Print "Hello World!" on the first line lcd.print("Hello World!"); void loop() // Do nothing


After uploading the code, you should see "Hello World!" on your LCD.


Advanced example: Display sensor data




This is a more advanced example that shows how to use the library to display sensor data on a 16x2 I2C LCD. You will need an Arduino board, an I2C LCD, a potentiometer, a light-dependent resistor (LDR), and some jumper wires.


The wiring is as follows:


I 2C LCDArduino Uno/NanoPotentiometerLDR


GNDGNDGND


VCC5V5V


SDAA4


SCLA5


A0Wiper


A1One leg


Other leg


GND<


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