arduino i2c lcd display tutorial for sale

This article includes everything you need to know about using acharacter I2C LCD with Arduino. I have included a wiring diagram and many example codes to help you get started.

In the second half, I will go into more detail on how to display custom characters and how you can use the other functions of the LiquidCrystal_I2C library.

Once you know how to display text and numbers on the LCD, I suggest you take a look at the articles below. In these tutorials, you will learn how to measure and display sensor data on the LCD.

Each rectangle is made up of a grid of 5×8 pixels. Later in this tutorial, I will show you how you can control the individual pixels to display custom characters on the LCD.

They all use the same HD44780 Hitachi LCD controller, so you can easily swap them. You will only need to change the size specifications in your Arduino code.

The 16×2 and 20×4 datasheets include the dimensions of the LCD and you can find more information about the Hitachi LCD driver in the HD44780 datasheet.

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. Check the table below for more details.

After you have wired up the LCD, you will need to adjust the contrast of the display. On the I2C module, you will find a potentiometer that you can turn with a small screwdriver.

The LiquidCrystal_I2C library works in combination with the Wire.h library which allows you to communicate with I2C devices. This library comes pre-installed with the Arduino IDE.

To install this library, go to Tools > Manage Libraries (Ctrl + Shift + I on Windows) in the Arduino IDE. The Library Manager will open and update the list of installed libraries.

*When using the latest version of the LiquidCrystal_I2C library it is no longer needed to include the wire.h library in your sketch. The other library imports wire.h automatically.

Note that counting starts at 0 and the first argument specifies the column. So lcd.setCursor(2,1) sets the cursor on the third column and the second row.

Next the string ‘Hello World!’ is printed with lcd.print("Hello World!"). Note that you need to place quotation marks (” “) around the text since we are printing a text string.

The example sketch above shows you the basics of displaying text on the LCD. Now we will take a look at the other functions of the LiquidCrystal_I2C library.

This function turns on automatic scrolling of the LCD. This causes each character output to the display to push previous characters over by one space.

If the current text direction is left-to-right (the default), the display scrolls to the left, if the current direction is right-to-left, the display scrolls to the right.

I would love to know what projects you plan on building (or have already built) with these LCDs. If you have any questions, suggestions or if you think that things are missing in this tutorial, please leave a comment down below.

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.

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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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The LCD is a frequent guest in Arduino projects. But in complex circuits, we may have a lack of Arduino ports due to the need to connect a screen with many pins. The way out in this situation can be the I2C/IIC adapter, which connects the almost standard Arduino 1602 shield to the Uno, Nano, or Mega boards with only four pins. This article will see how you can connect the LCD screen with an I2C interface, what libraries can be used, write a short example sketch, and break down typical errors.

The LCD 1602 Liquid Crystal Display is a good choice for displaying character strings in various projects. It is inexpensive, there are different backlight colors, and you can easily download ready-made libraries for Arduino sketches. But the most important disadvantage of this screen is the fact that the display has 16 digital pins, of which at least six are mandatory. So using this LCD screen without i2c adds serious limitations for Arduino Uno or Nano boards. If the pins are not enough, you will have to buy an Arduino Mega board or save the pins by connecting the display via I2C, among other things.

Because of the number of pins you have to connect, you may not have enough space to connect all the parts you need. Using I2C reduces the number of wires to 4 and the occupied pins to 2.

I2C/IIC (Inter-Integrated Circuit) – is a protocol originally created to communicate integrated circuits in an electronic device. The development belongs to Philips. The i2c protocol is based on an 8-bit bus, which is needed to link the blocks in the control electronics, and an addressing system that allows you to communicate on the same wires with multiple devices. We simply send data back and forth to one device or the other, adding the desired item’s ID to the data packets.

The simplest I2C circuit can have one master device (most often an Arduino microcontroller) and several slaves (such as an LCD). Each device has an address in the range of 7 to 127. There must not be two devices with the same address in one circuit.

The fastest and most convenient way to use the I2C display in the Arduino is to buy a ready-made screen with built-in protocol support. But there are not many of them, and they are not cheap. But a variety of standard screens have already been released in huge numbers. Therefore, the most affordable and popular option today is to buy and use a separate I2C module – adapter, which looks like this:

On one side of the module, we see I2C pins – ground, power, and 2 for data transfer. On the other side of the adapter, we see external power connectors. Of course, there are many pins on the board, with which the module is soldered to the standard pins of the screen.

The i2c outputs are used to connect to the Arduino board. If needed, we connect an external power supply for the backlight. With the built-in trim resistor, we can adjust the adjustable contrast value J.

You can find LCD 1602 modules with already soldered adapters on the market, and they are as simple as possible to use. If you bought a separate adapter, you have to solder it to the module beforehand.

If you use a special separate I2C adapter, you need to first sell it to the screen module. It’s hard to make a mistake there, and this diagram can guide you.

And that’s it! No cobwebs of wires that are very easy to get tangled in. That said, we can simply leave all the complexity of the i2C protocol implementation to the libraries.

The LiquidCrystal_I2C.h library, which includes a large variety of commands for controlling the monitor via the I2C bus and allows you to make your sketch easier and shorter. You need .to install the library LiquidCrystal_I2C.h after connecting the display additionally

LiquidCrystal_I2C lcd(0x27,16,2); //Indicate I2C address (the most common value), as well as screen parameters (in case of LCD 1602 - 2 lines of 16 characters each

In some cases, when using the above library with devices equipped with PCF8574 controllers, errors can occur. In that case, you can offer as an alternative to the library LiquidCrystal_PCF8574.h. It extends LiquidCrystal_I2C, so you shouldn’t have any problems using it.

If this does not help, then check if the pins are connected correctly and if the backlight power is connected. If you used a separate I2C adapter, check the quality of the solder pins again.

Another common cause of missing text on the screen can be a wrong I2C address. Try changing the device address from 0x27 to 0x20 or to 0x3F. Different vendors may have different default addresses. If this does not help, you can run the I2C scanner sketch, which looks through all connected devices and detects their address by brute force.

This article covers the fundamental questions about using the LCD screen in complex Arduino projects when we need to save some of the available pins. A simple and inexpensive I2C adapter will allow you to connect a 1602 LCD screen taking up only two analog pins. In many situations, this can be very important. The price for convenience is the need to use an additional module – converter and library. In our opinion, it is not a high price for the convenience, and we highly recommend to use this feature in projects.

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.

Usually, Arduino LCD display projects will run out of pin resources easily, especially with Arduino Uno. It can also be very complicated with the wire soldering and connections. This I2C 16x2 Arduino LCD Screen is using an I2C communication interface, meaning it only needs 4 pins from your microcontroller for the LCD display to run: VCC, GND, SDA, SCL.

The display comes with a "Gadgeteer" cable which you"ll probably not need as the Gadgeteer wiring system is no longer produced! The display does not come with a dedicated cable for the I2C connection - we just use standard jumper wires instead.

This tutorial shows how to use the I2C LCD (Liquid Crystal Display) with the ESP32 using Arduino IDE. We’ll show you how to wire the display, install the library and try sample code to write text on the LCD: static text, and scroll long messages. You can also use this guide with the ESP8266.

Additionally, it comes with a built-in potentiometer you can use to adjust the contrast between the background and the characters on the LCD. On a “regular” LCD you need to add a potentiometer to the circuit to adjust the contrast.

Before displaying text on the LCD, you need to find the LCD I2C address. With the LCD properly wired to the ESP32, upload the following I2C Scanner sketch.

After uploading the code, open the Serial Monitor at a baud rate of 115200. Press the ESP32 EN button. The I2C address should be displayed in the Serial Monitor.

Displaying static text on the LCD is very simple. All you have to do is select where you want the characters to be displayed on the screen, and then send the message to the display.

In this simple sketch we show you the most useful and important functions from the LiquidCrystal_I2C library. So, let’s take a quick look at how the code works.

The next two lines set the number of columns and rows of your LCD display. If you’re using a display with another size, you should modify those variables.

Then, you need to set the display address, the number of columns and number of rows. You should use the display address you’ve found in the previous step.

To display a message on the screen, first you need to set the cursor to where you want your message to be written. The following line sets the cursor to the first column, first row.

Scrolling text on the LCD is specially useful when you want to display messages longer than 16 characters. The library comes with built-in functions that allows you to scroll text. However, many people experience problems with those functions because:

The messageToScroll variable is displayed in the second row (1 corresponds to the second row), with a delay time of 250 ms (the GIF image is speed up 1.5x).

In a 16×2 LCD there are 32 blocks where you can display characters. Each block is made out of 5×8 tiny pixels. You can display custom characters by defining the state of each tiny pixel. For that, you can create a byte variable to hold  the state of each pixel.

In summary, in this tutorial we’ve shown you how to use an I2C LCD display with the ESP32/ESP8266 with Arduino IDE: how to display static text, scrolling text and custom characters. This tutorial also works with the Arduino board, you just need to change the pin assignment to use the Arduino I2C pins.

We hope you’ve found this tutorial useful. If you like ESP32 and you want to learn more, we recommend enrolling in Learn ESP32 with Arduino IDE course.

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LCDs are fun and we can use them in Arduino projects to show status messages or to display information like temperature or distance or any value instead of showing them in the serial monitor. In this tutorial we will learn how to connect 16×2 character LCD to Arduino board and how to display information on it.

I2C stands for Inter-Integrated Circuit. Standard LCDs typically require about 12 connections if you want to use it fully to use all its features. Our whole circuit will look complicated and we need to program each pin. It will also require more pins on the Arduino board.

In this tutorial, we will use I2C LCD. I2C LCD comes with a small circuit on the back of the LCD. This circuit has a PCF8574 chip and a built in potentiometer to adjust the LCD backlight. Using the I2C LCD is very simple. We only need two data pins (analog pins) to control the LCD. The picture below is the add on circuit you will find on the back of the I2C LCD. The blue colored cube shaped component is the potentiometer, to control the brightness of the LCD.

If you have the standard LCD, you can buy this add on circuit separately, and easily make your standard LCD into an I2C enabled LCD. Here is the link to buy it from amazon.

The connections for the I2C LCD display is fairly simple. Their are 4 wires we need to connect. 2 of them are for the ground and the power. The other 2 pins are for the SDA and the SCL. The SDA is the Serial Data pin. This pin carries and transmit the data that is going from the Arduino board to the LCD display. The SCL is the Serial Clock pin. This pin synchronizes the data transfer. Just like the shift register, it “clocks” data into the LCD. Both of these pins are connected to the analog pins on the Arduino board.

Using a display is a common need to have data visualization for projects including mobile screen. I2C 16X2 Liquid Crystal Character LCD Display is one of most used device and can be interfaced to Arduino Uno by using Arduino IDE

Liquid crystal display is an important part of a system and it helps to display the different constraints of the project. There are many types of LCD displays are available in the market and they can be easily identified by the interface; most of the LCD displays have ten pin interfaces and require appropriate cabling and code. The I2C LCD display has compatible driver circuitry of PCF8574 I2C chip which make simpler the cabling phase.

The most common family of LCD is 16×2 characters LCD which has sixteen columns and two rows of the characters and these can be effectively programmed in an Arduino environment. The pictorial view of the 16×2 LCD is shown in the figure.

In this tutorial, the focus of the work is character LCD. The word characters mean that alphabets (A, B, C… Z, a, b, … z and symbols) and decimals (1,2,3) can be displayed on this LCD. Other graphics like graphs, waveforms are not able to be displayed on it.

I2C LCD contains 4 pins, which are VCC, GND, SCL and SDA. SCL and SDA are dedicated to i2C communication. Every microcontroller has dedicated pins of I2C. For Arduino Uno are A4 (SDA) and A5 (SCL).

Connect your PC to Arduino and open Arduino IDE. For the very first steps, you can refer to Connecting Connecting Windows PC with Arduino tutorial. Download the “arduinoLCD” code and library from this link

Extract the folder from your PC. You will have a folder named “arduinoLCD” containing a file named “arduinoLCD.ino”. Open this file with your Arduino IDE.

This is the section before setup which is used for globe variables defining and libraries additions. Wire.h is the library for I2C two-wire communication, Liquid_crystal_I2C is an LCD library that communicates in the I2C communication protocol. Child of the library is created in the third line, which defines 0x27 as the i2c address, 16 are the columns while 2 are the rows. If you have a 20X4 LCD, just write down 20 by replacing 16 and 4 by changing 2.

This is the setup section in which LCD is initialised by lcd.begin() command, while LCD contains a light that can be turned on and off. When lcd.backlight is initialised, it turns ON the LCD lights. Character LCD comes in blue and yellow backlights.

In the loop section, LCD cursors are defined at which character needs to be written, lcd.setCursor (0,0) means cursor should be at the location of column 0 and row 0. lcd.print(“Seconds”) deals the seconds as a string and directly print it. If what is written is lcd.print(seconds), without double commas, the code will consider it as a variable, which should be defined.

Lcd.print(millis()/1000) where millis() is the time of the program when the Arduino board started, dividing by 1000 means milliseconds converted to seconds.

From your Arduino IDE, compile the code. Once compile operation has finished successfully, load it in your Arduino and the LCD Display will start showing with Arduino as in the following picture:

​Some of I2C LCD interfaces have pins (or solder pads) that can be changed to change the address. They are usually labelled as A0-A1-A2 . Here"s how the address change from a default 0x27 or 0x3F, if you connect the address pads together. (1 = Not Connected. 0 = Connected):

The lcd.begin(16,2) command set up the LCD number of columns and rows. For example, if you have an LCD with 20 columns and 4 rows (20x4) you will have to change this to lcd.begin(20x4).

The lcd.print("--message--") command print a message to first column and row of lcd display. The "message" must have maximum length equal to lcd columns number. For example, for 16 columns display max length is equal with 16 and for 20 columns display max length is equal with 20.

Thelcd.setCursor(0,1) command will set cursor to first column of second row. If you have an LCD 20x4 and you want to print a message to column five and third row you have to use: lcd.setCursor(4,2).