How to Connect I2C Lcd Display to Arduino Uno

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 : https://goo.gl/TlOucU

I2C LCD Display : https://goo.gl/Fh6su4

Male to female jumpers - 4 : https://goo.gl/nsAkuw

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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Comments

[GerardM51]

Hi There. I uploaded the code onto my arduino LCD screen however the backlight will not illuminate and I can barely see the text. any suggestions?

[EvanMaksud]

try rotating the potmeter?

[RobertVaughan01]

make sure that you are hooking up to A4 and A5 and not D4 and D5. It makes a difference.

[robert.reynolds1981]

What is the purpose of declaring LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); if we are using pins A4 and A5? I know that 0x27 is the ic address but what is the rest for?

[DanC292]

not sure if anyone is still interested but if you look in the LiquidCrystal_I2C.h file you will see the in comments for the initializer...
@param lcd_Addr[in] I2C address of the IO expansion module. For I2CLCDextraIO,
the address can be configured using the on board jumpers.
@param En[in] LCD En (Enable) pin connected to the IO extender module
@param Rw[in] LCD Rw (Read/write) pin connected to the IO extender module
@param Rs[in] LCD Rs (Reset) pin connected to the IO extender module
@param d4[in] LCD data 0 pin map on IO extender module
@param d5[in] LCD data 1 pin map on IO extender module
@param d6[in] LCD data 2 pin map on IO extender module
@param d7[in] LCD data 3 pin map on IO extender module

there is a bit more but i'll leave that for you to look into. in a more sophisticated IDE you normally can right click to a sub menu that will take you to the definition. it's a great way to help you get a deeper understanding of how things work.

[GerardM51]

Hi Robert did you manage to get an answer for this? I know that POSITIVE is used to turn on the backlight but mine wont illuminate. frustrating

[whitewolf81]

No I never got an answer. Mine works with the code, I am just trying to get a little background on it.

[EvanMaksud]

same here! plus idont know how to turn backlight off .plus i m not a pro. triple trouble :(

[PKMAST]

Hello Guys,
I am getting a error while i m going to add zip file of lcd library error id this zip file does not contains a valid library please help me to resolve this issue as soon as possible.....

[lemon p]

you should extract the zip file and click on it.
it would have two different zip file inside it
lastly, add both zip files into your library

[SongOfSickness]

Hey guys. My LCD works fine using the above instructions (when replacing the existing LCD library in the Arduino directory) but I can't get the backlight to ever switch off. Suggestions?

[saltpiefarm]

Hi
Pull the jumper off the i2c board which is marked LED
I hope this helps

[PKMAST]

Dear,

Rotate potentiotmeter

[SaraS263]

can i change the pin for SDA and SCL to A2 and A3 instead of A4 and A5

[dimitris04k]

hey guys what can i do beacause when i am going to uploaded they said that have multiplie librarys ???

[shaheen shah]

Hello bro My lcd is displaying nothing
Please help me i badly need it to display as my fyp is on way

[Barrett winn]

i cant seem to be able to add the library. it keeps saying that it isn't a valid library

[AYAN129]

I have written this code.But after compiling,it is showing the below written error message:
Arduino: 1.6.8 (Windows 10), Board: "Arduino/Genuino Uno"
I2C_LCD_TUTORIAL:6: error: 'POSITIVE' was not declared in this scope
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
^
exit status 1
'POSITIVE' was not declared in this scope
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

[SamirD28]

Ho friend, My suggestion, use LiquidCrystal_I2C lcd(0x27,16,2);
Where 16,2 is LCD display 16x2, you need to change the same as per your LCD.
0x27 is the i2c address..
Hope this helps.

[Broekgl]

I had the same problem. I deleted all libraries with i2c lcd in the arduino IDE. Then imported the one linked in the files here.
Worked like a charm