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:
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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)
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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)
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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:
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:
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:
// 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
GND10k resistor
5V10k resistor
The code is as follows:
// Declare an object of LiquidCrystal_I2C class LiquidCrystal_I2C lcd(0x27, 16, 2); // Define the analog pins for the potentiometer and the LDR #define POT_PIN A0 #define LDR_PIN A1 // Define some variables to store the sensor values int potValue = 0; int ldrValue = 0; void setup() // Initialize the LCD lcd.begin(); // Turn on the backlight lcd.backlight(); void loop() // Read the analog values from the potentiometer and the LDR potValue = analogRead(POT_PIN); ldrValue = analogRead(LDR_PIN); // Clear the display lcd.clear(); // Print the potentiometer value on the first line lcd.print("Potentiometer: "); lcd.print(potValue); // Set the cursor position to the second line lcd.setCursor(0, 1); // Print the LDR value on the second line lcd.print("LDR: "); lcd.print(ldrValue); // Wait for a second delay(1000);
This code will read the analog values from the potentiometer and the LDR and display them on the LCD. You can adjust the potentiometer knob and change the light intensity on the LDR to see how the values change.
Other possible applications and projects
The liquidcrystal_i2c lcd(0x27 16 2) library can be used for many other applications and projects that involve displaying information on an LCD. Here are some ideas:
Display the date and time using a real-time clock module.
Display the temperature and humidity using a DHT11 or DHT22 sensor.
Display the distance measured by an ultrasonic sensor.
Display a menu and options for controlling a device or a system.
Display a countdown timer or a stopwatch.
Display a game score or a quiz result.
Display a message or a status update.
Display a custom animation or a pattern.
Conclusion
In this article, we have learned 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 have also learned how to use the library to display text and numbers on the LCD. Finally, we have seen some examples and applications of using the I2C LCD in our projects.
The liquidcrystal_i2c lcd(0x27 16 2) library is a useful and easy-to-use library that can help you add a character LCD to your Arduino projects. It simplifies the wiring and makes the code easier. It also offers many features and advantages over the standard LiquidCrystal library. You can use it to display various information such as messages, menus, sensor data, etc. You can also create custom characters, scroll text, adjust backlight, and more.
We hope you have enjoyed this article and learned something new. If you have any questions or comments, please feel free to leave them below. Happy coding!
FAQs
What is I2C?
I2C I2C is a communication protocol that allows multiple devices to communicate with each other using only two wires: SDA (data) and SCL (clock). It is also known as Inter-Integrated Circuit or I2C-bus. It is widely used for connecting sensors, displays, memory, and other peripherals to microcontrollers such as Arduino.
What is the difference between the liquidcrystal_i2c lcd(0x27 16 2) library and the LiquidCrystal library?
The liquidcrystal_i2c lcd(0x27 16 2) library is a library for controlling I2C LCD displays, while the LiquidCrystal library is a library for controlling standard LCD displays. The main difference is that the I2C LCD uses only four pins (GND, VCC, SDA, and SCL) to communicate with Arduino, while the standard LCD uses six or more pins (RS, EN, D4-D7, VSS, VDD, and optionally RW and V0). The I2C LCD also has an I2C address that needs to be specified when declaring the object. The liquidcrystal_i2c lcd(0x27 16 2) library has functions similar to the LiquidCrystal library, but also some additional features such as backlight control, custom character creation, text scrolling, etc.
How can I change the size of the LCD?
If you have a different size of LCD than 16x2, you can change the parameters of the object declaration to match your LCD size. For example, if you have a 20x4 LCD, you can declare the object as follows:
LiquidCrystal_I2C lcd(0x27, 20, 4);
Make sure that your LCD has an I2C interface and that you know its I2C address.
How can I create and display custom characters?
You can create and display custom characters using the createChar() and write() methods of the object. The createChar() method takes two parameters: a number (0 to 7) that represents the custom character slot, and an array of bytes (8 elements) that defines the shape of the character. Each byte represents a row of pixels on the LCD, where 1 means on and 0 means off. For example, to create a smiley face character in slot 0, you can use this code:
byte smiley[8] = B00000, B10001, B00000, B00000, B10001, B01110, B00000, ; lcd.createChar(0, smiley);
To display the custom character on the LCD, you need to use the write() method with the number of the slot as the parameter. For example, to display the smiley face character on the first line of the LCD, you can use this code:
lcd.setCursor(0, 0); lcd.write(0);
How can I scroll text on the LCD?
You can scroll text on the LCD using the scrollDisplayLeft() and scrollDisplayRight() methods of the object. These methods scroll the entire display one position to the left or right. You can use them in a loop with a delay to create a scrolling effect. For example, to scroll "Hello World!" from right to left on the first line of the LCD, you can use this code:
lcd.setCursor(16, 0); lcd.print("Hello World!"); for (int i = 0; i 44f88ac181