How to Connect I2C Lcd Display to Arduino Uno




About: HI! I am Junez Riyaz, currently doing Bachelor of Technology in the field of Electronics and Communication Engineering. I am much interested in inventing something new yet from my childhood. In my leisure ti...

Hello Guys , In this Instructable you are going to see how to connect i2c lcd display to arduino and how to print on lcd display .

Before going to start this tutorial you must know a brief about i2c communication .

Each I2C bus consists of two signals: SCL and SDA. SCL is the clock signal, and SDA is the data signal. The clock signal is always generated by the current bus master; some slave devices may force the clock low at times to delay the master sending more data (or to require more time to prepare data before the master attempts to clock it out). This is called “clock stretching” and is described on the protocol page.

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Now lets start this Instructable ..

Step 1: Components Required

Arduino Uno :

I2C LCD Display :

Male to female jumpers - 4 :

Step 2: Circuiting

I2C Board of LCD Arduino

GND <---> GND

VCC <---> 5V

SDA <---> A4

SCL <---> A5

Step 3: Code

We must require to include two libraries ,in order to work the code attached .

Download the libraries from the attachment LCD library .

Basic functions we use in code

lcd.begin(16,2); //Defining 16 columns and 2 rows of lcd display

lcd.backlight(); //To Power ON /OFF the back light

lcd.setCursor(0,0); //Defining positon to write from first row,first column .

lcd.setCursor(0,1); //Defining positon to write from second row,first column .

lcd.print(" write here to print"); //You can write 16 Characters per line within quotations.

lcd.clear(); //Clean the screen

Step 4: Output

The outputs attached are done according to code attached above .

Step 5: Complete Video Tutorial

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    8 Discussions


    7 months ago

    Hi, Friends,

    I tried to do this project few times using various method. But I can not succeed. Black boxes are displayed instead of text. I adjusted contrast, Address etc. But my LCD panel and Arduino are working. Black light can control. Please help.



    7 months ago

    how come they tell me that "POSITIVE was not declared"?? I need help on this

    1 reply

    Reply 7 months ago

    Hi, I had the same problem. You can solve this in two ways:

    1) Add the line: #include <LCD.h>

    2) Add the line:

    typedef enum { POSITIVE, NEGATIVE } t_backlighPol;



    8 months ago

    Thank you i have been banging my head against the wall trying to get my LCD display to work and then I found your post and it finally worked. THANK YOU!!!