20x4 i2c lcd display arduino code pricelist

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.

Sometimes it may be necessary to use a display while making a hardware project, but the size and the type of the display may vary according to the application. In a previous project, we used a 0.96″ I2C OLED display, and in this project we will have an I2C 20×4 character display.

This liquid crystal display has 4 lines, 20 character in each line and cannot be used to display graphics. The main feature of this display that it uses I2C interface, which means that you will need only two wires to connect with Arduino. At the back side of the screen there is a small PCB soldered in the display, this circuit is a serial LCD 20 x 4 module and it also has a small trimpot to adjust the contrast of the LCD.

Display’s backlight is blue and the text is white. It is fully compatible with Arduino and has 5V input voltage. Its I2C address could be 0x27 or 0x3F. You can get it for about $7 from Bangood store.

DS3231 is a low-cost, accurate I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, so that if power is disconnected it maintains accurate time.

RTC maintains seconds, minutes, hours, day, date, month, and year information. Less than 31 days of the month, the end date will be automatically adjusted, including corrections for leap year. The clock operates in either the 24 hours or band / AM / PM indication of the 12-hour format. Provides two configurable alarm clock and a calendar can be set to a square wave output. Address and data are transferred serially through an I2C bidirectional bus.

First we need to download the library of the display, which includes all required functions to configure and write on the display. You can find it here.

Unzip the library and add it to the Arduino libraries folder, then run Arduino IDE and copy the following code. The first two lines are to include both of I2C and LCD libraries.

lcd.setCursor(3,0) will set the cursor of the LCD in the specified location, the first argument for the column and the second for the row starting form 0.

Here we will use a small breadboard to connect the RTC module and display with the Arduino’s I2C pins (A4 and A5). The SCL pins are connected with analog 5 pin and the SDA pins with analog 6 pin. The top rail of the breadboard used as I2C bus and the bottom one is power bus.

In addition to setup and loop function, we will create four other functions to organize the code. As the corners and vertical lines of the frame are special characters, we have to create them manually. So we will use a function to create them and another one to print them on the LCD.

Inside the loop function the time will be read from the real time clock module and the printed to the LCD using a custom function for each of time and date.

At first, we have to include the three libraries, I2C, LCD, and RTC and set the LCD address. Inside the setup function the display is initialized, then we will call createCustomCharacters() function and print them.

Each character can be 5-pixel long in width and 8-pixel in height. So to create a custom character we need to create a new byte. We need 5 characters, the vertical line and the four corners. The yellow pattern shows you how the character will be displayed on the LCD.

Inside createCustomCharacters() function, we called lcd.createChar(#, byte array) function. The LCD supports up to 8 custom characters numbered from 0 to 7. It will assign the index in the first argument to the character given by the byte array. To print this character we can use lcd.write(byte(#)) function.

This function is very simple, it uses lcd.setCursor(#,#) to move the cursor and lcd.print(“”) to print the given string. The function will print the top and bottom horizontal lines, then printing other custom characters.

As we discussed earlier, the loop function will get the current time and date every second and refresh them on the display. First we defined a time element “tm” which has current time data, then if the time is correct and the RTC module working fine the time and date will be printed.

PrintTime function uses three arguments, the column and line where it will print the time, and the time element. lcd.print(tm.Hour) will print the hour, then if the minutes and seconds are less than 10 we will add 0 to the left. And the same method is used to print the date.

Now everything is ready, upload the code to your Arduino and enjoy watching your new clock. You can find the full Arduino sketches and libraries in the attachment below.

On previous tutorials on our website, we have covered the use of several displays, LCDs, and TFTs, with diverse Arduino boards. From Nokia 5110 LCD display to different types of OLEDs, the reason for the tutorials has been to ensure that, as a reader, you know how to use many of the most popular displays so this help you make the best choice when trying to select the perfect display for your project. For today’s tutorial, we will continue in that line and examine how to use the 20×4 I2C Character LCD Display with Arduino.

The 20×4 LCD display is essentially a bigger (increased number of rows and columns) version of the 16×2 LCD display with which we have built several projects. The display has room to display 20 columns of characters on 4 rows which makes it perfect for displaying a large amount of text without scrolling. Each of the columns has a resolution of 5×8 pixels which ensures its visibility from a substantial distance. Asides its size, the interesting thing about this version of the display being used for today’s tutorial is the fact that it communicates via I2C, which means we will only require 2 wires asides GND and VCC to connect the display to the Arduino. This is possible via the Parallel to I2C module coupled to the display as shown in picture below. The I2C module can also be bought individually, and coupled to the 16 pins version of the display.

To demonstrate how to use this display, we will build a real-time clock which will display date and time on the LCD. To generate and keep track of date and time, we will use the DS3231 Real time clock. We covered the use of the DS3231 RTC module in the tutorial on DS3231 based Real-time Clock, you can check it out to learn more about its use with the Arduino.

The exact component used for this tutorial can be bought via the links attached and the power bank is only required to run the Arduino when not connected to the computer. You can replace this with a 9V battery and a center-positive power jack.

Since the display and the real-time clock are both I2C devices, they will be connected to the same pins on the Arduino. For the Arduino Uno, the I2C pins are located on Pin A5 (SCL) and A4 (SDA). This may differ on any of the other Arduino boards. Connect the components as shown in the schematics below;

To write the code for this project, we will use three main libraries; the DS1307 Library to easily interface with the DS3231 module, the liquid crystal I2C library to easily interface with the LCD display, and the Wire library for I2C communication. While the Wire library comes built into the Arduino IDE, the other two libraries can be downloaded and installed via the links attached to them.

As mentioned during the introduction, our task for today is to obtain time and date information from the RTC module and display on the LCD. As usual, I will do a breakdown of the code and try to explain some of the concepts within it that may be difficult to understand.

We start the code by including the libraries that will be used. After which we create an object of the Liquid crystal library, with the I2C address of the LCD as an argument. The I2C address can be obtained from the seller or as described in our tutorial on using the 16×2 LCD display to ESP32.

Next, we create a set of variables which comprises of byte arrays that represent custom characters to be created and displayed.  The custom characters are usually 5pixels in width and 8 pixels in height, representing each box in the rows or columns of the LCD. The byte array represents which pixels of the box to be turned on or off.

Next, we write the void setup function and start by initializing the library using the lcd.begin() function, with the first argument representing the number of columns, and the second argument representing the number of rows. After this, the CreateCustomCharacters() function is called to convert the char variables created above into characters that can be displayed on the LCD. One of the characters created is then used to create a UI/frame which is displayed using the printFrame() function.

The first function is the printTime() which breaks down the time data stored in the “tm” variable to extract seconds, minutes and hour values. These values are then displayed on the LCD using the lcd.print() function.

The printDate function is similar to the printTime function. It extracts date information from the variable tm and uses the lcd.print() function to display it.

The printFrame() function, on the other hand, was used to create a sort of user interface for the project. it makes use of the characters created above. Each of the custom characters created is displayed using the lcd.write(byte(x)) function with x being the character number of the character to be displayed. The characters are positioned on the LCD using the lcd.setCursor() function which takes numbers representing the column and row on which the character is to be displayed, as arguments.

As usual, go over the schematics to be sure everything is connected as it should be, then connect the Arduino board to your PC and upload the code to it. Ensure all the libraries have been installed to avoid errors.

Different projects, come with different screen requirements. If you need to display a large amount of information and the size is not a constraint, the 20×4 I2C display is definitely one of the options you should consider.

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.

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.

The LCD2S-204 is a RoHS compliant Serial LCD Daughter board that can be connected to a standard 20x4 Character Display Module that supports 4 bit mode. It enables the LCD display to be controlled via an I2C or SPI serial bus. The contrast and backlight are software controlled, and can be set to 254 levels.

The LCD2S-204 includes a 4x4 (16 button) matrix keypad encoder with software debouncing. A keypad with up to 16 buttons (4 rows by 4 columns) can be added to the display via a standard 10 pin, 2.54mm header. Our 12 button or 16 button keypads can be used, and can be connected to the LCD2S-204 via the CAB16RIB150 ribbon cable. When using the I2C serial bus, an interrupt line will be activated when a key is pressed, informing the user that there is key data to be read. Alternatively the LCD2S-204 can be polled to see if it has any pending keypad data.

The LCD2S-204 also has 5 user configurable, general purpose inputs/outputs. Two of them can deliver up to 1000mA each, and have protection circuitry for driving relays.

The LCD used must supports 4 bit mode. All 20x4 Character Modules sold on our site support 4 bit mode, and nearly all commercially available LCD Character Modules support it too. The LCD2S-204 has a high speed SPI/I2C serial bus. For convenience the I2C and SPI signals are available via a Micro Match type connector, and a standard 2.54mm, 2x6 row pin header. Most new Modtronix SBC boards have Micro Match connectors, and can be connected to the LCD2S-204 using these 150mm or 300mm cables. Or, the conn-micmat6-MW Micro Match connector can be used to create a custom cable.

A 2-way DIP switch is used to configure the unit for SPI or I2C operation (3 different addresses). See our forum for many I2C, SPI, Arduino and other code examples.

The LCD2S has 2 general purpose open collector outputs, OUT1 and OUT2. These outputs can supply up to 1000mA, and have protection circuitry for driving relays. Both OUT1 and OUT2 are enabled by default. They are available via the X3 connector (2x6 pin header).

A matrix keypad supporting up to 16 buttons (4x4 matrix) can be connected to the LCD2S-204. The keypad is connected to the pins marked R1 to R4 (rows) and C1 to C4 (columns) on the X1 1x10 pin header. The LCD2S has built in button debouncing, which can be configured for different values. The default should work fine though.

The picture on the right shows and example of connecting a 12 button keypad, relay and buzzer to the LCD2S. The buzzer can be configured to sound each time a button is pressed, or controlled via the OUT command.

What is included1 x Serial LCD daughter board. The 16 pin connector that fits onto the LCD display is also assembled. To use this board with a 20x4 Character Display Module it just has to be soldered to the back of it.

It"s unlikely that you have killed the unit as this is pretty hard to do from the data interface and your picture is typical for an LCD that has not gone through the initialization sequence. A dead LCD driver will usually display nothing and what your picture shows is that the LCD controller itself is operating. If anything is dead, I would suspect the I2C interface board as this would yield the same result you are seeing. It may also be that the timing of the I2C interface is right on the edge which may explain why a long cable"d setup is working.

The driver I use works on every display I have ever hooked to it, regardless of changes in the particular project"s processor clock speed because I paid strict attention to the worst case timing requirements. If the timing of the I2C interface violates one LCD it may not violate another, i.e. one display can tolerate bad timing while another can"t. There are also issues if the LCD driver uses the busy flag or not: Blind data transmission without reading the LCD"s busy state will work if the LCD is fast enough and the driver is slow enough, otherwise "No bueno!" plus the interface is not going to operate at its maximum speed. When using the busy flag (Bit 7 of the interface) there is solid handshaking which confirms (Instead of "Trusts") that the LCD is ready for the next cycle and allows operation right up to the limit of performance.

Timing tolerances and variation between parts is like lug nuts on a car... If you car has 5 lug nuts per wheel, it will probably work with 3 or even 2 but NOT UNDER ALL CONDITIONS. SOME LCDs will be happy with bad timing but ALL LCDs NEVER will be.

A 20x4 LCD display is very basic module and is very commonly used in various devices and circuits. These modules are preferred over seven segments and other multi segment LEDs. The reasons being: LCDs are economical; easily programmable; have no limitation of displaying special & even custom characters (unlike in seven segments), animations and so on.

A 20x4 LCD means it can display 20 characters per line and there are 4 such lines. In this LCD each character is displayed in 5x7 pixel matrix. This LCD has two registers, namely, Command and Data. This is standard HD44780 controller 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.