20x4 i2c lcd display arduino code manufacturer

ERM2004FS-2 is 20 characters wide,4 rows character lcd module,SPLC780C controller (Industry-standard HD44780 compatible controller),6800 4/8-bit parallel interface,single led backlight with white color included can be dimmed easily with a resistor or PWM,fstn-lcd positive,black text on the white color,high contrast,wide operating temperature range,wide view angle,rohs compliant,built in character set supports English/Japanese text, see the SPLC780C datasheet for the full character set. It"s optional for pin header connection,5V or 3.3V power supply and I2C adapter board for arduino.

It"s easily controlled by MCU such as 8051,PIC,AVR,ARDUINO,ARM and Raspberry Pi.It can be used in any embedded systems,industrial device,security,medical and hand-held equipment.

Of course, we wouldn"t just leave you with a datasheet and a "good luck!".For 8051 microcontroller user,we prepared the detailed tutorial such as interfacing, demo code and Development Kit at the bottom of this page.

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.

LCD Display Module I2C 20x4 Blue Arduino -  If your current LCD is frustrating you because it occupies all your GPIO pins and lacks characters" space, it is time to replace it with this one. This LCD Display Module uses an I2C communication interface, which only needs 2 wires to display information on any microcontroller-based project, including the Arduino. It is capable of displaying 4 lines of 20 white characters on a blue background. Moreover, it is compatible with either 3.3V or 5V logic systems, which is basically everything in programmable electronics.

A regular LCD is substantially more difficult to connect than an I2C LCD. Instead of 12, only 4 pins must be connected. Start by connecting the GND pin to the ground and the VCC pin to the Arduino"s 5V output. The I2C communication pins are all that is left at this point. Keep in mind that the I2C pins on each Arduino board vary and must be linked appropriately. The SDA (data line) and SCL (clock line) are located on the pin headers close to the AREF pin on Arduino boards with the R3 configuration. They also go by the names A5 (SCL) and A4 (SDA).

To power, the LCD, connect the Arduino"s USB port. The backlight will be visible lighting up. You will now begin to see the first row of rectangles as you adjust the potentiometer"s knob. Congratulations if that occurs! Your LCD is operational. After completing this, we can begin programming the LCD.

You must first install a library called LiquidCrystal I2C to drive an I2C LCD. The LiquidCrystal library that comes with your Arduino IDE has been improved by this library.

You can narrow your search by entering "liquid-crystal." Several entries ought to be present. Look for Frank de Brabander"sLiquidCrystal I2C library. Select Install after clicking that entry.

As was already said, the manufacturer determines the LCD"s I2C address. The default I2C address for LCDs powered by Texas Instruments PCF8574 chips is 0x27Hex. The default I2C address for LCDs powered by NXP Semiconductors" PCF8574 chip is 0x3FHex.

Therefore, your LCD"s I2C address is most likely 0x27Hex or 0x3FHex. However, it is advised that you ascertain the LCD"s precise I2C address before utilizing it. Fortunately, there is a simple method for doing this, due to Nick Gammon.

A straightforward I2C scanner sketch created by Nick scans your I2C bus and gives the addresses of each I2C device it encounters. Launch your Serial Monitor after loading this sketch onto your Arduino. You get to see the I2C address of your I2C LCD.

As we all know, though LCD and some other displays greatly enrich the man-machine interaction, they share a common weakness. When they are connected to a controller, multiple IOs will be occupied of the controller which has no so many outer ports. Also it restricts other functions of the controller. Therefore, LCD2004 with an I2C bus is developed to solve the problem.

I2C bus is a type of serial bus invented by PHLIPS. It is a high performance serial bus which has bus ruling and high or low speed device synchronization function required by multiple host system. I2C bus has only two bidirectional signal lines, Serial Data Line (SDA) and Serial Clock Line (SCL). The blue potentiometer on the I2C LCD2004 is used to adjust backlight to make it easier to display on the I2C LCD2004.

I²C (Inter-Integrated Circuit), pronounced I-squared-C, is a multi-master, multi-slave, single-ended, serial computer bus invented by Philips Semiconductor (now NXP Semiconductors). It is typically used for attaching lower-speed peripheral ICs to processors and microcontrollers. Alternatively I²C is spelled I2C (pronounced I-two-C) or IIC (pronounced I-I-C).

I²C uses only two bidirectional open-drain lines, Serial Data Line (SDA) and Serial Clock Line (SCL), pulled up with resistors. Typical voltages used are +5 V or +3.3 V although systems I²C (Inter-Integrated Circuit), pronounced I-squared-C, is a multi-master, multi-slave, single-ended, serial computer bus invented by Philips Semiconductor (now NXP Semiconductors). It is typically used for attaching lower-speed peripheral ICs to processors and microcontrollers. Alternatively I²C is spelled I2C (pronounced I-two-C) or IIC (pronounced I-I-C).

3) Find the file LiquidCrystal_I2C which you just download. Click it open and then you"ll be prompted by "Library added to your libraries. Check "Import libraries"”. You also can see the libraries just imported have appeared on the list by Sketch->Include Library->LiquidCrystal_I2C.

If everything is correct,But the display just shows 16 black rectangles on Line 1.it may be the address of i2c is not 0x27,therfore you need to run the following code to read the address,then modify the 0x27 to which you read.

This is a 20x4 Arduino compatible LCD display module with high speed I2C interface. It is able to display 20x4 characters on two lines, whitecharacterson blue background.

Generally, LCD display will run out of Arduino pin resource. It needs 6 digital pins and 2 power pin for a LCD display. If you want to build a robot project, it will be a problem with Arduino UNO and LCD display.

This I2C 20x4 LCD display module is designed for Arduino microcontroller. It is using I2C communication interface, With this I2C interface, only 2 lines (I2C) are required to display the information on any Arduino based projects. It will save at least 4 digital / analog pins on Arduino. All connector are standard XH2.54 (Breadboard type). You can connect it with jumper wire directly.

This 1602 LCD module has 8 I2C address in all, from 0x20 to 0x27. You can set one according to your requirements, avoiding the confliction of I2C address. And its contrast can be adjusted manually.

This board is able to be powered by 5V or 3.3V which make it compatible with both Arduino 101 or Arduino DUE, intel edison 3.3V system and standard Arduino UNO/Arduino Mega 5V system.

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.

Just getting the i2c address may not be enough. This is because there is no standard for how the PCF8574 is wired up to the LCD or how to control the backlight. As a result different backpack manufacturers wire them up in different ways and use different backlight control circuits.

This means that even if the Arduino library is given the correct i2c address it still may not work if the library also does not know how the PCF8574 output port pins are wired up to the hd44780 LCD interface pins.

The sample code shown in the original post is using a LiquidCrystal_I2C library that assumes a particular pin wiring between the PCF8574 and the LCD. It appears to be using/expecting the LiquidCrystal_I2C library available through the IDE library manager.

If the backpack uses the specific wiring that the library assumes, then all that is necessary is to get the I2C address correct. If the wiring used on the backpack is different than what the library assumes, it will not work even if the correct i2c address is used.

Then you can look at the other hd44780_I2Cexp i/o class examples like HelloWorld, to see what files need to be included and how to declare your lcd object.

I"ve checked and the two versions differ quite a bit. The one titled as v1.4.1 doesn"t like my I2C and comes up with Device Found: UNKNOWN Only supports PCF 8574.

I am working on a project that will analog read some high voltage power supplies data and then print the data (voltage 0-10000V and Amperage 0-1ma) on an lcd screen. I have 2 displays both 20x4 with I2C connectivity the first is 2004A with an I2C Backpack that has a PCF8574. The second Display is a CFA634 20x4 I2C LCD CFA634 Data Page. The problem I have is that when I connect the first display to my code it works perfectly but when I connect the second display it just displays gibberish with the only code change being the address changing from 0x27 to 0x2A. Attached is my code as well as the GitHub to the libraries that I am using as well as the code that you can get from the manufacture of the display that works on an Arduino UNO that I don’t understand and doesn’t compile for the Arduino due. Also attached is the Github to a cfa632 library that compiles for Arduino UNO but doesn’t compile for Arduino due because it uses the software serial library and isn’t supported by the Due. Any guidance on the root of the problem or what info you need to help let me know as I am stuck. Thanks in advance and sorry for the wall of text.

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.

The Arduino family of devices is features rich and offers many capabilities. The ability to interface to external devices readily is very enticing, although the Arduino has a limited number of input/output options. Adding an external display would typically require several of the limited I/O pins. Using an I2C interface, only two connections for an LCD character display are possible with stunning professional results. We offer both a 4 x 20 LCD.

The character LCD is ideal for displaying text and numbers and special characters. LCDs incorporate a small add-on circuit (backpack) mounted on the back of the LCD module. The module features a controller chip handling I2C communications and an adjustable potentiometer for changing the intensity of the LED backlight. An I2C LCD advantage is that wiring is straightforward, requiring only two data pins to control the LCD.

A standard LCD requires over ten connections, which can be a problem if your Arduino does not have many GPIO pins available. If you happen to have an LCD without an I2C interface incorporated into the design, these can be easily

The LCD displays each character through a matrix grid of 5×8 pixels. These pixels can display standard text, numbers, or special characters and can also be programmed to display custom characters easily.

Connecting the Arduino UNO to the I2C interface of the LCD requires only four connections. The connections include two for power and two for data. The chart below shows the connections needed.

The I2C LCD interface is compatible across much of the Arduino family. The pin functions remain the same, but the labeling of those pins might be different.

Located on the back of the LCD screen is the I2C interface board, and on the interface is an adjustable potentiometer. This adjustment is made with a small screwdriver. You will adjust the potentiometer until a series of rectangles appear – this will allow you to see your programming results.

The Arduino module and editor do not know how to communicate with the I2C interface on the LCD. The parameter to enable the Arduino to send commands to the LCD are in separately downloaded LiquidCrystal_I2C library.

The LiquidCrystal_I2C is available from GitHub. When visiting the GitHub page, select the Code button and from the drop-down menu, choose Download ZIP option to save the file to a convenient location on your workstation.

Before installing LiquidCrystal_I2C, remove any other libraries that may reside in the Arduino IDE with the same LiquidCrystal_I2C name. Doing this will ensure that only the known good library is in use. LiquidCrystal_I2C works in combination with the preinstalled Wire.h library in the Arduino editor.

To install the LiquidCrystal_I2C library, use the SketchSketch > Include Library > Add .ZIP Library…from the Arduino IDE (see example). Point to the LiquidCrystal_I2C-master.zip which you previously downloaded and the Library will be installed and set up for use.

Several examples and code are included in the Library installation, which can provide some reference and programming examples. You can use these example sketches as a basis for developing your own code for the LCD display module.

There may be situations where you should uninstall the Arduino IDE. The reason for this could be due to Library conflicts or other configuration issues. There are a few simple steps to uninstalling the IDE.

The I2c address can be changed by shorting the address solder pads on the I2C module. You will need to know the actual address of the LCD before you can start using it.

Once you have the LCD connected and have determined the I2C address, you can proceed to write code to display on the screen. The code segment below is a complete sketch ready for downloading to your Arduino.

The code assumes the I2C address of the LCD screen is at 0x27 and can be adjusted on the LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27,16,2); as required.

Similar to the cursor() function, this will create a block-style cursor. Displayed at the position of the next character to be printed and displays as a blinking rectangle.

This function turns off any characters displayed to the LCD. The text will not be cleared from the LCD memory; rather, it is turned off. The LCD will show the screen again when display() is executed.

Scrolling text if you want to print more than 16 or 20 characters in one line then the scrolling text function is convenient. First, the substring with the maximum of characters per line is printed, moving the start column from right to left on the LCD screen. Then the first character is dropped, and the next character is displayed to the substring. This process repeats until the full string has been displayed on the screen.

The LCD driver backpack has an exciting additional feature allowing you to create custom characters (glyph) for use on the screen. Your custom characters work with both the 16×2 and 20×4 LCD units.

A custom character allows you to display any pattern of dots on a 5×8 matrix which makes up each character. You have full control of the design to be displayed.

To aid in creating your custom characters, there are a number of useful tools available on Internet. Here is a LCD Custom Character Generator which we have used.

Blue backlight with white text 20 character X 4 line LCD. The LCD display has the I2C backpack module mounted on the back side which requires only two connected

Features：IIC/I2C interface was developed to reduce the IO port usage on Arduino board.* Old 1602 screen requires 7 IO ports but this module uses only two.* Much needed control panel IO ports can be used to add some sensors, SD card and so on.* A New High-Quality 4 Line 20 Character Lcd Module.* Potentiometer can be adjusted to control the contrast.* Back light can be turned off by removing the jumper on the back panel.Specification:* Interface: I2C* I2C Address: 0x27* Pin Definition : GND、VCC、SDA、SCL* Back lit (Yellow with Black char color)* Supply voltage: 5V* Size : 60mm×99mm* Contrast Adjust : Potentiometer* Backlight Adjust : Jumper

If you followed my first article for getting your Arduino Nano set up (Getting Started With Arduino Using the Small, Inexpensive Nano Board[^]), you are ready to do more with your Nano now.

Most of the code samples from the Arduino site add in lines that write information to the Serial port which can then be viewed in the Arduino IDE Serial Monitor program. However, that is a bit annoying because each time you go to send upload your code to your Arudino, you"ll need to make sure the Serial Monitor isn"t running or else, you"ll often get a conflict since the Arduino is writing statements to the Serial Monitor and the program is trying to upload the new program to the Arudino.

It is so easy to add a 20 (character) X 4 (character) LCD (Liquid Crystal Display) to your Nano that I thought it might make a helpful article to show you which one to get and how to quickly hook it up and use it.

So that we have some interesting data to display, I"ll show you how to read varying values from an input pin. We can cause the values to vary easily by attaching a potentiometer to an analog pin and I"ll show you how to do that.

When I started working with the Arduino, I waited far too long to order a simple output device (LCD) and learn how to use it. It is so simple and so helpful it should really be one of the first things you learn to do. Once you do, I believe you"ll find that it opens up your Arduino programming in a dramatic way as it empowers you to know more about what the code is actually doing. Plus, it"s fun to see your little device writing to the screen.

This one includes the I2C interface (Inter-Integrated Circuit which is a binary serial communication protocol). This protocol is also known as TWI - Two Wire Interface. The LCD is only about $9.50.

Two are to power the LCD (voltage and ground), one is to carry the serial data (which will be displayed) and the fourth one is the serial clock which manages the speed for the transmitted data.

Now, compare the previous LCD to a similar one that does not implement I2C (uses a parallel interface instead). You can see that there are far more wires to deal with. Those wires will take up more of your Arduino"s pins too so if you"re building a larger project, that could limit you.

I suffered quite a bit with that 20x4 LCD because my soldering skills were poor and if any one of the data lines is hooked up perfectly properly, you will not see anything or you will see garbled characters and odd output. It is quite difficult to determine which line isn"t connected properly.

I highlighted the pins where I saw the notation for SCL and SDA with the red box. This indicates that all we have to do is connect the SDA pin to A4 and the SCL pin to A5 and the LCD will work for us.

Although using the LCD with the I2C module is much easier because there is less wiring, the I2C module isn"t directly provided with the other base libraries. Instead, we need to download it and drop it in our Arduino IDE installation directory.

Whenever an include statement uses the < and > brackets, it means that the default library paths will be searched and that is why we added the new files to our \libraries directory under the Arduino IDE installation.

Next, we need to initialize the object we will use to call the LCD functionality. We will call the object lcd. Since this object will be used throughout the program, we will initialize it in the global space outside the setup() method and the loop()method.

The address (0x3F) of for the I2C component. This will be provided by the manufacturer and for your screen, you will always use the same address. I2C allows multiple components to be hooked up to it because each one gets its own address.

int a3Value = analogRead(analogPin); //1 lcd.setCursor(2,1); //2 sprintf(formattedValue, "%04d", a3Value); //3 lcd.print(formattedValue); //4}