20x4 i2c lcd display arduino code brands

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.

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.

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.

/* Arduino "Clock" with LCD (20x4) I2C.This I2C LCD backpack contains the PCF8574 port-expanderIC. Beware that this sketch can work with backpacks thatcontains this IC, but may not work with variations.Components:- Arduino Uno- LCD I2C (20x4)Libraries:- LiquidCrystal_I2C libraryCreated on 25 June 2022 by c010rblind3ngineer*/#include LiquidCrystal_I2C lcd(0x27, 20, 4);const int a_sec = 900; // clock second handint Hrs, Mins;int Secs = 0;String AmPm; // to store the string data to display "AM" or "PM"int ampm; // to store user inputint day, d, m, yr;char *DAYS[] = {"Mon", "Tues", "Wed", "Thurs", "Fri", "Sat", "Sun"};char *MONTHS[] = {"Jan", "Feb", "Mar", "Apr", "May", "June","July", "Aug", "Sep", "Oct", "Nov", "Dec"};void setup(){Serial.begin(9600);lcd.init();lcd.backlight();clkInit();}void loop(){//...Display Time to LCD...lcd.setCursor(0, 1);lcd.print("Time: ");printolcd(Hrs);lcd.print(":");printolcd(Mins);lcd.print(":");printolcd(Secs);lcd.print(AmPm);//...Clock starts...Secs++;if (Secs == 60) {Secs = 0;Mins++;}if (Mins == 60) {Mins = 0;Hrs++;}if (Hrs == 13) {Hrs = 1;}if (Hrs == 12 && Mins == 00 && Secs == 00) {if (AmPm == "AM") {AmPm = "PM";}else {AmPm = "AM";d++;reset_dom(m); // reset the day to 1 when the days of the month exceed it"s limit//...Reset LCD row 0 and update date...lcd.setCursor(0, 0);lcd.print(" ");lcd.setCursor(0, 0);lcd.print(DAYS[day]); // mon, tues, wed... etc.lcd.print(", ");printolcd(d);lcd.print(" ");lcd.print(MONTHS[m - 1]);lcd.print(" ");lcd.print(yr);day++;}}delay(a_sec); // delay acts as the clock second hand}///////////////////////////////////////////Initialise the "clock" settings///////////////////////////////////////////void clkInit() {Serial.println("What is the day today? (1 - 7)");Serial.println("\t(1) Monday\n\t(2) Tuesday\n\t(3) Wednesday\n\t(4) Thursday\n\t(5) Friday\n\t(6) Saturday\n\t(7) Sunday");while (Serial.available() == 0) {}; // wait for user inputday = Serial.parseInt(); // store what day is today in integer variable "day"delay(500);Serial.println("\nWhat is today"s date?");Serial.print("Day (1 - 31): ");while (Serial.available() == 0) {}; // wait for user inputd = Serial.parseInt(); // store day in integer variable "d"printoserial(d);Serial.print("\nMonth (1 - 12): ");while (Serial.available() == 0) {}; // wait for user inputm = Serial.parseInt(); // store month in integer variable "m"Serial.print(MONTHS[m - 1]);Serial.print("\nYear (YYYY): ");while (Serial.available() == 0) {}; // wait for user inputyr = Serial.parseInt(); // store year in integer variable "yr"Serial.print(yr);delay(500);Serial.print("\n\n\tToday is ");Serial.print(DAYS[day - 1]);Serial.print(", ");printoserial(d);Serial.print(" ");Serial.print(MONTHS[m - 1]);Serial.print(" ");Serial.print(yr);Serial.print("\n\nIs it - (1)AM or (2)PM ?");while (Serial.available() == 0) {};ampm = Serial.parseInt();delay(500);if (ampm == 1) {AmPm = "AM";Serial.print("\nClock set to AM\n\n");}if (ampm == 2) {AmPm = "PM";Serial.print("\nClock set to PM\n\n");}delay(500);Serial.print("Input Hours (1 - 12) : ");while (Serial.available() == 0) {} // wait till the user inputs dataHrs = Serial.parseInt();printoserial(Hrs);delay(500);Serial.print("\nInput Minutes (0 - 59) : ");while (Serial.available() == 0) {} // wait till the user inputs dataMins = Serial.parseInt();printoserial(Mins);delay(500);Serial.print("\n\n\tClock set to : ");//...Display time to Serial Monitor...printoserial(Hrs);Serial.print(":");printoserial(Mins);Serial.print(AmPm);//... Display Date to LCD...lcd.setCursor(0, 0);lcd.print(DAYS[day - 1]);lcd.print(", ");printolcd(d);lcd.print(" ");lcd.print(MONTHS[m - 1]);lcd.print(" ");lcd.print(yr);}//////////////////////////////////////////////////////////////////////////////To put an extra "0" infront of the variables on the Serial Monitor//////////////////////////////////////////////////////////////////////////////void printoserial(int val){if (val < 10) {Serial.print("0");Serial.print(val);}else {Serial.print(val);}}///////////////////////////////////////////////////////////////////To put an extra "0" infront of the variables on the LCD///////////////////////////////////////////////////////////////////void printolcd(int val){if (val < 10) {lcd.print("0");lcd.print(val);}else {lcd.print(val);}}void reset_dom(int var) {switch (var) {case 1: // Jan - 31 daysif (d == 32) {d = 1;m++;}break;case 2: // Feb - 28 daysif (d == 29) {d = 1;m++;}break;case 3: // March - 31 daysif (d == 32) {d = 1;m++;}break;case 4: // April - 30 daysif (d == 31) {d = 1;m++;}break;case 5: // May - 31 daysif (d == 32) {d = 1;m++;}break;case 6: // June - 30 daysif (d == 31) {d = 1;m++;}break;case 7: // July - 31 daysif (d == 32) {d = 1;m++;}break;case 8: // August - 31 daysif (d == 32) {d = 1;m++;}break;case 9: // September - 30 daysif (d == 31) {d = 1;m++;}break;case 10: // October - 31 daysif (d == 32) {d = 1;m++;}break;case 11: // November - 30 daysif (d == 31) {d = 1;m++;}break;case 12: // December - 31 daysif (d == 32) {d = 1;m++;}break;}}

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.

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.

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

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

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

This I2C 20x4 LCD display module is designed forArduino 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.

I2C 2004 character LCD display module is 4 lines of 20 characters. It has backlight and IIC communication interface. For Arduino beginners, it will make complicated LCD driver circuit connection easy. It can be directly connected to the Arduino Sensor Shield IIC device interface or easily connected to the Arduino with its 4 pins.

Maybe a bit late, but I’d like to note that it is certainly possible to dim the backlight on LCDs that come with an I2C adaptor. It’s as simple as wiring the upper pin (the one labeled LED) of the I2C board to a PWM pin in the Arduino. Using analogWrite() will vary the LED brightness from 0 (LED off) to 255.

4 line, 20 positions alphanumeric LCD 2004 with HD44780 (or compatible) display controller and the standard 4/8 bit parallel interface. The available I2C interface (option) fits right on the back of the display and turns its interface from parallel to simple 2-wire I2C (perfect for microcontrollers like Arduino to save on I/O ports).

4×20 blue LCD character display with bright white LED backlight, high contrast, and optional serial interface (I2C, SDA/SCL) for microcontrollers. The display needs a 5V power supply for operation. With the I2C interface installed, the backlight can be controlled by software as well. Many different libraries for different programming languages and controller families are available, also countless examples.