arduino lcd display i2c brands

If you’ve ever tried to connect an LCD display to an Arduino, you might have noticed that it consumes a lot of pins on the Arduino. Even in 4-bit mode, the Arduino still requires a total of seven connections – which is half of the Arduino’s available digital I/O pins.

The solution is to use an I2C LCD display. It consumes only two I/O pins that are not even part of the set of digital I/O pins and can be shared with other I2C devices as well.

True to their name, these LCDs are ideal for displaying only text/characters. A 16×2 character LCD, for example, has an LED backlight and can display 32 ASCII characters in two rows of 16 characters each.

If you look closely you can see tiny rectangles for each character on the display and the pixels that make up a character. Each of these rectangles is a grid of 5×8 pixels.

At the heart of the adapter is an 8-bit I/O expander chip – PCF8574. This chip converts the I2C data from an Arduino into the parallel data required for an LCD display.

If you are using multiple devices on the same I2C bus, you may need to set a different I2C address for the LCD adapter so that it does not conflict with another I2C device.

An important point here is that several companies manufacture the same PCF8574 chip, Texas Instruments and NXP Semiconductors, to name a few. And the I2C address of your LCD depends on the chip manufacturer.

According to the Texas Instruments’ datasheet, the three address selection bits (A0, A1 and A2) are placed at the end of the 7-bit I2C address register.

According to the NXP Semiconductors’ datasheet, the three address selection bits (A0, A1 and A2) are also placed at the end of the 7-bit I2C address register. But the other bits in the address register are different.

So your LCD probably has a default I2C address 0x27Hex or 0x3FHex. However it is recommended that you find out the actual I2C address of the LCD before using it.

Connecting an I2C LCD is much easier than connecting a standard LCD. You only need to connect 4 pins instead of 12. Start by connecting the VCC pin to the 5V output on the Arduino and GND to ground.

Now we are left with the pins which are used for I2C communication. Note that each Arduino board has different I2C pins that must be connected accordingly. On Arduino boards with the R3 layout, the SDA (data line) and SCL (clock line) are on the pin headers close to the AREF pin. They are also known as A5 (SCL) and A4 (SDA).

After wiring up the LCD you’ll need to adjust the contrast of the display. On the I2C module you will find a potentiometer that you can rotate with a small screwdriver.

Plug in the Arduino’s USB connector to power the LCD. You will see the backlight lit up. Now as you turn the knob on the potentiometer, you will start to see the first row of rectangles. If that happens, Congratulations! Your LCD is working fine.

To drive an I2C LCD you must first install a library called LiquidCrystal_I2C. This library is an enhanced version of the LiquidCrystal library that comes with your Arduino IDE.

Filter your search by typing ‘liquidcrystal‘. There should be some entries. Look for the LiquidCrystal I2C library by Frank de Brabander. Click on that entry, and then select Install.

The I2C address of your LCD depends on the manufacturer, as mentioned earlier. If your LCD has a Texas Instruments’ PCF8574 chip, its default I2C address is 0x27Hex. If your LCD has NXP Semiconductors’ PCF8574 chip, its default I2C address is 0x3FHex.

So your LCD probably has I2C address 0x27Hex or 0x3FHex. However it is recommended that you find out the actual I2C address of the LCD before using it. Luckily there’s an easy way to do this, thanks to the Nick Gammon.

But, before you proceed to upload the sketch, you need to make a small change to make it work for you. You must pass the I2C address of your LCD and the dimensions of the display to the constructor of the LiquidCrystal_I2C class. If you are using a 16×2 character LCD, pass the 16 and 2; If you’re using a 20×4 LCD, pass 20 and 4. You got the point!

First of all an object of LiquidCrystal_I2C class is created. This object takes three parameters LiquidCrystal_I2C(address, columns, rows). This is where you need to enter the address you found earlier, and the dimensions of the display.

In ‘setup’ we call three functions. The first function is init(). It initializes the LCD object. The second function is clear(). This clears the LCD screen and moves the cursor to the top left corner. And third, the backlight() function turns on the LCD backlight.

After that we set the cursor position to the third column of the first row by calling the function lcd.setCursor(2, 0). The cursor position specifies the location where you want the new text to be displayed on the LCD. The upper left corner is assumed to be col=0, row=0.

There are some useful functions you can use with LiquidCrystal_I2C objects. Some of them are listed below:lcd.home() function is used to position the cursor in the upper-left of the LCD without clearing the display.

lcd.scrollDisplayRight() function scrolls the contents of the display one space to the right. If you want the text to scroll continuously, you have to use this function inside a for loop.

lcd.scrollDisplayLeft() function scrolls the contents of the display one space to the left. Similar to above function, use this inside a for loop for continuous scrolling.

If you find the characters on the display dull and boring, you can create your own custom characters (glyphs) and symbols for your LCD. They are extremely useful when you want to display a character that is not part of the standard ASCII character set.

CGROM is used to store all permanent fonts that are displayed using their ASCII codes. For example, if we send 0x41 to the LCD, the letter ‘A’ will be printed on the display.

CGRAM is another memory used to store user defined characters. This RAM is limited to 64 bytes. For a 5×8 pixel based LCD, only 8 user-defined characters can be stored in CGRAM. And for 5×10 pixel based LCD only 4 user-defined characters can be stored.

Creating custom characters has never been easier! We have created a small application called Custom Character Generator. Can you see the blue grid below? You can click on any 5×8 pixel to set/clear that particular pixel. And as you click, the code for the character is generated next to the grid. This code can be used directly in your Arduino sketch.

After the library is included and the LCD object is created, custom character arrays are defined. The array consists of 8 bytes, each byte representing a row of a 5×8 LED matrix. In this sketch, eight custom characters have been created.

Hello friends welcome back to Techno-E-solution, In previous video we see how to interface LCD 16×2 to Arduino Uno, but there are very complicated circuits, so in this tutorial, I"ll show you how to reduce circuitry by using I2C module which is very compact & easy to connection. Simply connect I2C module with LCD parallel & connect I2C modules 4 pins to Arduino. I2C module has 4 output pins which contains VCC, GND, SDA, SCL where 5V supply gives to I2C module through VCC & GND to GND of Arduino. SDA is a data pin & SCL is clock pin of I2C module. To interface LCD and I2C with Arduino we need Liquid Crystal I2C Library in Arduino IDE software.

To make this project we need Arduino Liquidcrystal library in Arduino IDE. Follow following steps to add this library in Arduino IDE software.Open Arduino IDE Software.

In general you should load the library files from the same place that you get your I2C adapter. The libraries are not interchangeable even though they have the same names.

C:\Users\lilab\Documents\Arduino\libraries\NewliquidCrystal/LiquidCrystal_I2C.h:53:4: error:  initializing argument 3 of "LiquidCrystal_I2C::LiquidCrystal_I2C(uint8_t, uint8_t, t_backlighPol)" [-fpermissive]

(I tried this code with numbers 0x27, 16 and 2 as it originally came. Also tried it later with 0x3F, 20, and 4 to denote a 20x4 display (which mine was). Same result. I wouldn"t think having different numbers like that would cause it to fail during compile time, though perhaps it might fail during run time. But I could never get it to compile in the first place without errors.

However a better approach is to install from the IDE Library Manager, Bill Perry"s "HD44780" library and use the test program and examples from that instead of the older LiquidCrystal_I2C.

Recently I bought a cheap I2C controller and 16x2 display off of eBay, and since there seemed to be a lot of documentation online, I thought it would be an easy thing to hook up to my Uno. Instead, it took me weeks to figure it out. (Don"t laugh, I"m new at this.) I noticed that there wasn"t that much documentation about my specific I2C board, so I decided to help change that by posting the results of my work.

First of all, getting the I2C board properly connected wasn"t hard. This 5v device connects to the Arduino just like any other I2C device. 4 pins: Ground, 5V power, A4/SDA and A5/SCL. Because things weren"t working (for other reasons, but I had no idea the time), I tried to hook it up straight, and then I did it again using 4.7K Ohm pull-up resistors to improve signal quality. Both methods worked, so don"t be so concerned with the pull-up resistors unless you are experiencing problems.

Next, testing to see if the I2C board itself works and responds to I2C commands is important. I recommend an I2C scanner, because this will tell you if the MJKDZ board is acknowledging I2C commands. I got mine at this website: http://gammon.com.au/i2c about half way down the page. There"s a lot of great I2C information there. When I ran my I2C scanner, it told me that the device has an I2C address of 0x20. This is interesting, because the eBay seller claimed the address was 0x27, which is totally not true. So it happens to be very important to run an I2C scanner on your device to confirm the address, because no sketch will work correctly if you don"t have the right address.

Excited that my I2C board was working, I hooked up my 16x2 display, and loaded up an I2C "hello world" sketch and.... nothing. I tried all the sketches I could find on Google, and still, nothing. Sometimes, the back light would turn on and off, and sometimes, the screen would have strange flashing and gibberish. At first I thought it was a connection issue, so I tested the continuity of every wire, but everything was fine. I also tried turning the tiny screw on the blue potentiometer, as that adjusts the contrast on the display. Still, nothing. I spent many days searching the internet and trying everything I could get my hands on, but nothing seemed to work until yesterday. Here is what is needed for sketches to work:

Step 1: Remove all LCD libraries from your Arduino IDE. Check both the user specific ones, as well as in the Arduino install folder. Zip them up and save them somewhere else if you think you might need them again, otherwise, delete.

Step 2: Install the new and improved LCD library by F Malpartida from here: https://bitbucket.org/fmalpartida/new-liquidcrystal/wiki/Home This person has done some awesome work for the Arduino community.

I pressed upload and it worked the first time! After all that hard work, it now seemed so easy. I think the secret is that the pins on the I2C device aren"t standard, so may need to be remapped, which is what I think happens in the code above. This would also explain why those pins on the MJKDZ board have no labels. For me as a new Arduino user, it was quite a hassle, but it all worked in the end, and I learned lots, so I can say that this was $5.23 well spent. I hope this post helps any other new owners of the MJKDZ I2C LCD1602 boards save some time figuring things out the hard way.

Hoping someone can help me!! Yes I have searched and looked at many threads and bits of code, this seems a common problem, but unlike a cold! no common cure. The LCD is a very common 2x16 using the HD chip the 447..? and that works fine.

I purchased from eBay this i2c backpack, used the i2c scanner to find the address at 0x27, Installed the latest up to date Libraries, I could find for LCD & LCD_i2c...

This code and others like it don"t compile but complain of NEGATIVE or POSITIVE in indicated line. <<<< I also installed the LCD_i2c library indicated here.

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In this Arduino LCD I2C tutorial, we will learn how to connect an LCD I2C (Liquid Crystal Display) to the Arduino board. LCDs are very popular and widely used in electronics projects for displaying information. There are many types of LCD. This tutorial takes LCD 16x2 (16 columns and 2 rows) as an example. The other LCDs are similar.

In the previous tutorial, we had learned how to use the normal LCD. However, wiring between Arduino and the normal LCD is complicated. Therefore, LCD I2C has been created to simplify the wiring. Actually, LCD I2C is composed of a normal LCD, an I2C module and a potentiometer.

lcd.print() function supports only ASCII characters. If you want to display a special character or symbol (e.g. heart, angry bird), you need to use the below character generator.

Depending on manufacturers, the I2C address of LCD may be different. Usually, the default I2C address of LCD is 0x27 or 0x3F. Try these values one by one. If you still failed, run the below code to find the I2C address.

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Referring to the LCD16020, I believe that everyone is not unfamiliar with the square shape, green color, a row of 2.54 pin header.... LCD1602 module is a product of the DFRobot Gravity I2C series, which has been greatly optimised for its original LCD1602 appearance. This module does not need to adjust the contrast, retain the backlight controllable function, and simultaneously compatible with 3.3V and 5V voltage. The optimisation of function and the appearance will bring you the different experience.

Gravity: I2C LCD1602 Arduino LCD Display Module (Green) Click a star to leave your reviewWorst experience possibleA bad experienceA moderate experienceA satisfied experienceA very positive experience

I"m just trying to print a string onto an LCD display (SparkFun 20x4 SerLCD - RGB Backlight Qwiic). The address of the I²C device is 0x72. I"m using an Arduino Teensy to communicate with the LCD display.

In the attached image lcd.init() just prints the characters up to the 11!! and when the lcd.print("2") is used it printed the random characters and also the 11!!. I"m not sure where to go from here, any help is greatly appreciated. Image of LCD display