![]() Then connect the digital pin 12 of Arduino to the RS of LCD module.Then connect the 5V of Arduino to the VDD of the LCD module.Then connect K, which is the ground of backlight LED also to the ground.Then connect RW to the ground for selecting write mode.Then connect the V0 of the LCD to the ground for full contrast.First, connect the ground of Arduino to the VSS of the LCD.The same code and circuit will work for all Arduino and compatible boards.Ĭonnect the circuit as shown in the below diagram. In the first method, we are interfacing the LCD1602 with Arduino using the data pins of the LCD module. They are responsible for the parallel data transfer. Read Write Select pin 0: Write mode 1: Read mode Register Select 0: Instruction Register 1: Data Register Some other sizes are,Ĭontrast adjustment 0v: Max contrast 5v: Min contrast the most commonly used one is LCD1602 which can display 16 characters in each line, which is a total of 32 characters. LCD modules are coming in different colors and sizes with a different number of displayable characters. Wire Library – Will available in Arduino IDE by default.LiquidCrystal I2C Library – Download – For the second method.LiquidCrystal Library – Will available in Arduino IDE by default – For the first method.This sketch tests standard 7-bit addresses.ĭevices with higher bit address might not be seen properly.In this getting started with LCD module tutorial we are going to learn about two different ways of interfacing an LCD module with popular development boards like Arduino Nano, Arduino Uno, Arduino Mega, Arduino Leonardo. You can copy the code by clicking on the button in the top right corner of the code field. The latest version of this library can be found here on GitHub or click the download button below. This library has many built-in functions that make programming the LCD quite easy. In this tutorial, I will be using the LiquidCrystal_I2C library. Installing the LiquidCrystal_I2C Arduino library Once that is done, we can start programming the LCD. You can tweak the contrast later if needed. Now rotate the potentiometer until one (16×2 LCD) or 2 rows (20×4 LCD) of rectangles appear. Plug in the USB connector of the Arduino to power the LCD. On the I2C module, you will find a potentiometer that you can turn with a small screwdriver. Adjusting the contrast of the LCDĪfter you have wired up the LCD, you will need to adjust the contrast of the display. SDA and SCL pin locations on different Arduino boards. Note that an Arduino Uno with the R3 layout (1.0 pinout) also has the SDA (data line) and SCL (clock line) pin headers close to the AREF pin. If you are not using an Arduino Uno, the SDA and SCL pins can be at a different location. The connections are also given in the table below. You only need to connect 4 pins instead of 12. Wiring an I2C LCD is a lot easier than connecting a standard LCD. Later in this tutorial, I will show you how you can control the individual pixels to display custom characters on the LCD. If you look closely at the LCD, you can see the small rectangles that form the individual characters of the LCD.Įach rectangle is made up of a grid of 5×8 pixels. How to use a 16×2 character LCD with Arduino.Luckily, you can also buy the I2C add-on circuit separately on Amazon, so you can easily upgrade a standard LCD as well.įor a tutorial and wiring diagram for standard character LCDs, please see the following article: Standard LCDs typically require around 12 connections, which can be a problem if you do not have many GPIO pins available. You only need two data pins to control the LCD. The advantage of an I2C LCD is that the wiring is very simple. ![]() This module features a PCF8574 chip (for I2C communication) and a potentiometer to adjust the LED backlight. The I2C LCD that we are using in this tutorial comes with a small add-on circuit mounted on the back of the module. This type of LCD is ideal for displaying text and numbers, hence the name ‘character LCD’. This guide is part of our hub of articles on Arduino Displays. As an Amazon Associate we earn from qualifying purchases. ![]() ![]() is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to products on. (I also have an article on How To Control A Character I2C LCD with ESP32 if you want to work with an ESP32 microcontroller instead).
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