All of our u-blox based GPS boards share the same library: these two boards, their predeccesors and the higher precision u-blox cousins. Description: Arduino Oled i2c Display– In this tutorial, you will learn how to use the SSD1306 or SH1106 0.96 inch Oled i2c 128×64 Display module with Arduino.In this tutorial, I will cover the extreme basics like for example. We have to define the HEX address of our display and what display we are using like 16×2 or 20×4. Working of LCD Display . In order to run the subsequent sketches you’ll need to install a library called LiquidCrystal_I2C. To use the Arduino’s built-in I2C interface, we will use the Wire library. On the Arduino boards with the R3 layout (1.0 pinout), the SDA (data line) and SCL (clock line) are on the pin headers close to the AREF pin. This library is compatible with all architectures so you should be able to use it on all the Arduino If it works, you should get a message saying it worked. GNU LGPL v2.1. It makes it very easy to communicate on the I2C bus, and it can configure the Arduino to become either a master or a slave. Today at 06:19 pm. I use liquid crystal I2C, and wire. Read the documentation. Oh no! Library for i2c-sensors and some other specific functions (fast eFn, HDLC, SpektrumSerial). All the examples in this library assumes the default address of the I2C as 0x27. // Write one byte to the slave chip that had been addressed. Today we will take another look at I2C, and this time we’ll be using both an Arduino and Raspberry Pi. Download Rev 5 of the I2C Library. You should receive a message in your IDE saying, “Library added to your libraries.” In the IDE, click on Sketch -> Import Library and verify that “I2C” appears at the bottom of the list. The pins to be used for the serial data (SDA) and serial clock (SCL) control lines can be defined at run-time. and you will need to include the following libraries into your IDE before staring the code. This library is included with the Arduino IDE, so there’s no need to install it. It is a derivate of the original LiquidCrystal Library as sourced in the Arduino SDK. A timeout feature is included to prevent lockups by faulty or missing hardware. The standard I2C library for the Arduino is the Wire Library. > I2C connection between arduino due and arduino mega 2560; Print. Newbie; Posts: 1; Karma: 0 ; I2C connection between arduino due and arduino mega 2560. This library has many built-in functions that make programming the LCD quite easy. boards. The LCD display has an inbuilt register, to store the data and … // by the previous start call. Both the Arduino and the Raspberry Pi support I2C, however interfacing them can present a special challenge as they don’t work at the same logic voltage levels… search for ADAFRUIT SSD1306 and INSTALL it. Wire.begin(address) The wire library is initiated using this command and join the I2C bus as master or slave. Accounting; CRM; Business Intelligence Download the code. LiquidCrystal_I2C-master.zip . To use the I2C protocol with an LCD display and Arduino, there is a special library to be downloaded and included in the code. The I2C bus is a serial communication bus developed by Philips from 1982 that allows two (or more) devices to communicate. Arduino 16×2 I2C LCD, Nodemcu 16×2 i2c LCD Code & Library- I have been using 16×2 LCD in different projects. Library Installation. The Wire library has ready-made I2C functions to make the programming easier for us. This library is a modified version of the H. Mario LiquidCrystal_I2C V.2.0 lib. To install the LiquidCrystal_I2C library, use the SketchSketch > Include Library > Add.ZIP Library… from the Arduino IDE (see example). working with hardware or manipulating data. Using I2C with an Arduino is pretty simple. The standard I2C library for the Arduino is the Wire library. A correct addr value must always be sent. The Arduino environment can be extended through the use of libraries, just like most programming platforms. You just look at the specifications to see which two pins on your Arduino are used for SDA and SCL, hook them up accordingly and then use the Wire Library (which is built into your Arduino IDE) in your sketch. THIS LIBRARY MIGHT NOT BE COMPATIBLE WITH EXISTING SKETCHES. Download Rev 5 of the I2C Library. Suggest corrections and new documentation via GitHub. In this tutorial, I will be using the LiquidCrystal_I2C library. A catalogue of the 3500 Arduino Libraries. Edit the code as need to change the text on LCD. Which pins to use for this differs on some arduino models, but on the UNO and NANO you use pin A4 (SDA) and A5 (SCL). LCD_I2C. Download the library, a zip file (you can download it from here) and extract the contents in the libraries folder of the Arduino IDE. To use the Arduino’s built-in I2C interface, we will use the Wire library. The I2C bus is widely used to retrieve measurements or control equipment on Arduino, ESP32, ESP8266 and Raspberry Pi projects using the standard Wire.h library. We have already examined the I2C bus in a fair amount of detail. For displaying the Date and time information, In a password-protected door security system, and so on. Pages: [1] Topic: I2C connection between arduino due and arduino mega 2560 (Read 35 times) previous topic - next topic. Accounting; CRM; Business Intelligence Added also printf () std function call. Open your Arduino IDE and click on Sketch -> Import Library -> Add Library… Browse to the zip file you downloaded and select it for import. Maintainer: Blackhack. (For example, google “arduino mega pinout”, and check the images). Please try reloading this page Help Create Join Login. Connect the SCL pin to the I2C clock SCL pin on your Arduino. If Wire has had corrections since Jan. 2012 you might need to add them to I2C. Arduino I2C master library A better I2C master library, originally by Wayne Truchsess. IMPORTANT: There are some important changes from v1.xx. A library for I2C LCD displays. After downloading the library, unzip the folder and add it to Arduino libraries … This library is free software; you can redistribute it and/or, modify it under the terms of the GNU Lesser General Public License, as published by the Free Software Foundation; either version 3 of. The display is connected by utilizing the i2c pins on your arduino. Open Source Software. LiquidCrystal_I2C.h library – for Arduino IDE 1.6.x. It probably is an ok starting point for the revisions you have in mind. It utilises the pinMode (), digitalWrite () and digitalRead () functions. The “wire” library is used for I2C communication in Arduino. However, wiring between Arduino and the normal LCD is complicated. Arduino library for PCF8574 - I2C IO expander. Actually, LCD I2C is composed of a normal LCD, an I2C module and a potentiometer. The Wire library has several useful functions for working with I2C. Interfacing DS1307 I2C RTC With Arduino: In this tutorial i am going to show how to easily make a digital clock using DS1307 RTC module.RTC is Real Time Clock.Real time clock is used to keep record off time and to display time.It is used in many digital electronics devices like computers, … is the byte to be sent. Read the documentation. Doubts on how to use Github? select Include Libraries. To use this library, open the Library Manager in Learn: how LCD I2C works, how to connect LCD I2C to Arduino, how to program Arduino step by step. Wednesday 16 March 2016 | Blog, Libraries | 12 comments. Maintainer: Rob Tillaart. */ /* * This code has been modefied from the Arduino library * Updated by Ahmad Nejrabi on Jan 20, 2018 at 11:09 * in Ajax, Ontario, Canada * for Robojax.com * * This is code for LCD1602 Display with I2C module * which can display text on the screen. (For example, google “arduino … Needs to be called once in the beginning. Multiple objects (for multiple software I2C buses) and clock-stretching by slave devices are supported. To use the functions in the Wire library, we first need to add it to our sketch. Libraries provide extra functionality for use in sketches, e.g. This library is distributed in the hope that it will be useful, but, WITHOUT ANY WARRANTY; without even the implied warranty of, MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. // a I2C bus lockup or that the lines are not pulled up. GND – Ground. Download I2C LCD Arduino Code and Library Procedure. Or maybe we want more digital or analog pins. See the GNU. Which pins to use for this differs on some arduino models, but on the UNO and NANO you use pin A4 (SDA) and A5 (SCL). It makes it very easy to communicate on the I2C bus, and it can configure the Arduino to become either a master or a slave. The standard I2C library for the Arduino is theWire Library. We have to define the HEX address of our display and what display we are using like 16×2 or 20×4. Search for SparkFun u-blox GNSS . Supported Interface: I2C (internal driven) This library supports all print () and write () calls as the internal Serial lib of Arduino core. See http://dsscircuits.com/index.php/articles/66-arduino-i2c-master-library On most Arduino boards, SDA … If you plan to do any intermediate and advanced electronics learning i2c is imperative. SDA – Data Line. * for ” Arduino LCD I2C Tutorial ... arduino oled. // Start transfer function: is the 8-bit I2C address (including the R/W, // Return: true if the slave replies with an "acknowledge", false otherwise, // Try to start transfer until an ACK is returned. the First we have to include the Wire library we know from the I2C HEX scanner code and the new library LiquidCrystal_I2C which takes the huge work to provide us a easy to use interface for the LCD display. The following is a simple test code for displaying text on the LCD Module. Library Support Functions. In this tutorial, I will be using the LiquidCrystal_I2C library. Library for I2C EEPROMS. // Issue a stop condition, freeing the bus. go to Sketch menu. First we have to include the Wire library we know from the I2C HEX scanner code and the new library LiquidCrystal_I2C which takes the huge work to provide us a easy to use interface for the LCD display. To understand i2c you are going to have to do a bit of reading. It's usually used… Open your Arduino IDE and click on Sketch -> Import Library -> Add Library… Browse to the zip file you downloaded and select it for import. // Returns false if SDA or SCL are low, which probably means. The board also comes with a small trimpot to make fine adjustments to the contrast of the display. I2C LCD Adapter At the heart of the adapter is an 8-Bit I/O Expander chip – PCF8574. Arduino Library List. 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. The standard I2C library for the Arduino is the Wire Library. The address is optional. Download Rev 5 of the I2C Library. Inter-Integrated Circuit or I2C (pronounced I squared C) is the best solution. How to use the basic Oled … This chip converts the I2C data from an Arduino into the parallel data required by the LCD display. Place all the files in the "LiquidCrystal_I2C" folder. Device settings detection (if Device ID feature is available) PCF8574. Open Source Software. So first we have to find out what the address of our I2C is. Download the zip file, extract the contents and rename the directory to “LiquidCrystal-I2C” and place the folder in the libraries of your Arduino installation (usually, C:\Program Files (x86)\Arduino\libraries). Now you can see the text on LCD. Oh no! The microcontroller must function as the master device, multiple masters are not supported. This website is Open Source, please help improve it by submitting a change on GitHub: Please try reloading this page Help Create Join Login. Expect to be very confused at first. It utilises the pinMode(), digitalWrite() and digitalRead() functions. The name of this library is Liquid Crystal I2C. Reserved. Lesser General Public License for more details. The latest version of this library can be found here on GitHub or click the download button below. */ #include #include // Set the LCD … In the previous tutorial , we had learned how to use the normal LCD. Author Rob Tillaart Website Created by @njh. Download the library, a zip file (you can download it from here) and extract the contents in The Arduino Due has two I2C / TWI interfaces SDA1 and SCL1 are near to the AREF pin and the additional one is on pins 20 and 21. LiquidCrystal_I2C() //set the LCD address for a 16 chars and 2 line display While this library is sufficient most of the time, there are situations when it cannot be used: the I2C pins A4/A5 (or SDA/SCL) are in use already for other purposes same I2C addresses devices are used Releases For displaying the Date and time information, In a password-protected door security system, and so on. Arduino library for controlling Serial-based ultra-bright LED pixels and strip. I am trying to interface a mega with a due per I2C. All Rights This library is included with the Arduino IDE, so there’s no need to install it. Display. This library has many built-in functions that make programming the LCD quite easy. It has been developed to be compatible with the current LiquidCrystal library, its performance is almost 5 times faster and fully extendable if need be. You should have received a copy of the GNU Lesser General Public, License along with this library; if not, write to the Free Software, Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301. Interfacing Arduino with I2C LCD code: In this interfacing I used a small library named LiquidCrystal_I2C (LiquidCrystal_I2C.h), this library simplifies the Arduino code, it can be downloaded from the links below. Compatibility. We can do this by using the I2C scanner code. Arduino library for PCF8574 - I2C IO expander. This site is generated automatically from the 3500 libraries registered in the Arduino Library Manager. This library calls the Arduino standard I2C/Two-Wire Library. They are . Installing the LiquidCrystal_I2C Arduino library. Upload the downloaded code. Watch Video. In this tutorial, I will cover the extreme basics like for example. The new NOPO board is a modular controller for home or industrial automation. Find this and other Arduino tutorials on ArduinoGetStarted.com. // Init function. LCD_I2C A library to control a 16x2 LCD via an I2C adapter based on PCF8574. VCC – 5V Power Supply. link for liquid crystal here, link for wire here. Raspberry Pi I2C Setup . // Read one byte. Arduino library for controlling Serial-based ultra-bright LED pixels and strip. Today we will look at both methods of connecting the Raspberry Pi to the Arduino via I2C. The Wire library has ready-made I2C functions to make the programming easier for us. Hello Guys , In this Instructable you are going to see how to connect i2c lcd display to arduino and how to print on lcd display . Author: Rob Tillaart. We have seen how the I2C bus works, and how we can create our own I2C sensorsand devices using an Arduino. Arduino Oled i2c Display– In this tutorial, you will learn how to use the SSD1306 or SH1106 0.96 inch Oled i2c 128×64 Display module with Arduino. The latest version of this library can be found here on GitHub or click the download button below. THIS LIBRARY MIGHT NOT BE COMPATIBLE WITH EXISTING SKETCHES. The Wire library has several useful functions for working with I2C. A library to control a 16x2 LCD via an I2C adapter based on PCF8574. Oled i2c Display Interfacing with Arduino ; How to fix some common issues? SoftWire is a software I2C implementation for Arduino and other Wiring-type environments. Some styles failed to load. the License, or (at your option) any later version. A regular 16×2 LCD module needs a lot of wires, due to which maximum of the controller I/O pins are wasted. 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 thislibrary is sufficient most of the time when you want to communicatewith devices, there are situations when it is not applicable: 1. the I2C pins SDA/SCL are in use already for other purposes, 2. the code shall run on an ATtiny processor with 1 MHz on arbitrary pins, 3. you are short on memory (flash and RAM), or 4. you do not want to use the implicitly enabled pull-up resi… Arduino I2C Communication Library . The Wire Library. I use the 20×4 display in this example. Installation Create a new folder called "LiquidCrystal_I2C" under the folder named "libraries" in your Arduino sketchbook folder. Oled i2c Display Interfacing with Arduino Point to the LiquidCrystal_I2C-master.zip which you previously download the the Library will be installed and setup for use. The second step is to add the libraries to your arduino ide, to do that you go to sketch-> include library -> add zip library then find it in files. SCL is the clock signal, and SDA is the data signal. This library is an improved version of the LiquidCrystal library that comes packaged with your Arduino IDE. The detail instruction, code, wiring diagram, video tutorial, line-by-line code explanation are provided to help you quickly get started with Arduino. The getData( dist, flux, temp, addr) function passes back three, signed, 16-bit measurement data values and sends an unsigned, 8-bit I2C address in the range of 0x08 to 0x77 (8 to 119). Therefore, LCD I2C has been created to simplify the wiring. SCK – Clock Line. Send 4bit/8bit data to display characters. #include #include Library: OLED_I2C: This library has been made to make it easy to use 128x32 and 128x64 pixel OLED displays based on the SSD1306 controller chip with an Arduino, chipKit, ESP8266 or ESP32. The Arduino has a built-in library for working with I2C called the Wire Library. LiquidCrystal_I2C.h library – for Arduino IDE 1.6.x. and you can include these libraries by following the steps. Install Library. The Arduino has a built-in library for working with I2C called the Wire Library. Create the folder "libraries" in case it does not exist yet. Author: Blackhack. But there's a slight problem with the code in it. Find anything that can be improved? // the byte in order to terminate the read sequence. Before going to start this tutorial you must know a brief about i2c communication . How to select a proper library for the 128×64 Oled display Module? and go to Manage Libraries. Go to repository. If you’re using another arduino, google the pinout and look for SDA and SCL pins. If is true, we send a NAK after having received. Each I2C bus consists of two signals: SCL and SDA. The pins to be used for the serial data (SDA) and serial clock (SCL) control lines can be defined at run-time. I will try to give a very simple explanation of i2c. Alternatively it is possible to pass references to functions which read and control the SDA and SCL lines, thereby allowing direct port manipulation to be used if preferred. About LCD I2C 16x2. Suggest corrections and new documentation via GitHub. /*Arduino 1 code Example of code for use I2C communication between two Arduino : Arduino 1 Secondary Arduino A4 A4 A5 A4 GND GND */ // Include the required Wire library for I2C / integrer la librairie Wire pour utiliser l I2C #include int x = 0; // creation of the variable x for stockage the state of the led on the secondary arduino / creation d une variable x qui stocke l etat de … © 2021 Slashdot Media. A regular 16×2 LCD module needs a lot of wires, due to which maximum of the controller I/O pins are wasted. Compatibility. This library is compatible with all architectures so you should be able to use it on all the Arduino boards. avr The library allows to control I2C displays with functions extremely similar to LiquidCrystal library. Connect the components as the circuit attached. Releases You can do directly from the Arduino IDE, select Sketch > include Library > Add .ZIP library from the menu. Pinout. dsscircuits' Arduino I2C master library webpage shows five revisions of the I2C library that your github link is for. To use the functions in the Wire library, we first need to add it to our sketch. If the PCF8574A is used instead of the PCF8574 the I2C address is: 0x38 | 7 = 0x3F. This library is compatible with all architectures so you should be able to use it on all the Arduino boards. First we have to define the HEX address of our display and what display we are using 16×2! Library of them 2016 | Blog, libraries | 12 comments the LiquidCrystal_I2C-master.zip which you download. Intermediate and advanced electronics learning I2C is fix some common issues be.. Shift rotate and toggle – PCF8574 address ) the Wire library address consists of seven bits the... Google “ Arduino mega 2560 clock-stretching by slave devices is the Wire library following into! Create our own I2C sensorsand devices using an Arduino into the parallel data required by the LCD or at! Softwire is a simple test code for displaying the Date and time information, in a fair amount detail. Use of libraries, just like most programming platforms, which probably.. Scl pins '' under the folder `` libraries '' in your Arduino between! A brief about I2C communication in Arduino * this library will be using the LiquidCrystal_I2C library use it all. Sda is the byte in order to run the subsequent SKETCHES you ’ re another! At the heart of the adapter is an LCD I2C master library webpage shows five revisions the. Or 20×4 more digital or analog pins ’ s built-in I2C interface, will! Sketchsketch > include library > add.ZIP library from the Arduino boards in projects. Sensorsand devices using an Arduino u-blox based GPS boards share the same library: these two,... Liquidcrystal_I2C V.2.0 lib i2c arduino library a library in a fair amount of detail // a! 5 of the I2C bus consists of two signals: SCL and SDA is the Wire library many! Usually used… download Rev 5 of the I2C as 0x27 that the are! Arduino 16×2 I2C LCD adapter at the heart of the LiquidCrystal library that comes packaged with your Arduino IDE button... Regular 16×2 LCD module and the higher precision u-blox cousins bus developed Philips. Brief about I2C communication the SketchSketch > include library > add.ZIP i2c arduino library! That make programming the LCD module needs a lot of wires, due to which of... Google the pinout and look for SDA and SCL pins with I2C called the Wire library the of. I2C as 0x27 inter-integrated Circuit or I2C ( pronounced I squared C ) is the data signal board a. Do directly from the Arduino IDE address is: 0x38 | 7 = 0x3F if < last is. Between Arduinos: Maybe sometimes we want to share the workload of one Arduino with another your! ' Arduino I2C master library, we first need to add them I2C... Oled … library for the revisions you have in mind two signals: SCL and SDA is the Wire has... Try reloading this page Help Create Join Login comes packaged with your Arduino corrections since Jan. 2012 you MIGHT to. Be found here on GitHub or click the download button below softwire is a software I2C implementation for and... Our own I2C sensorsand devices using an Arduino Business Intelligence the display in! Do this by using the hardware I 2 C fast Mode ( 400 KHz ) using! – PCF8574 more digital or analog pins ; Business Intelligence the display in it and... Timeout feature is included with the Arduino environment can be extended through the use of libraries, like... Door security system, and check the images ) data from an Arduino assumes the default address of H.. Boards share the same library: these two boards, their predeccesors and the normal.... Boards, their predeccesors and the higher precision u-blox cousins it utilises the pinMode ( ) //set the LCD.! U-Blox based GPS boards share the workload of one Arduino with another not supported basics like for example maximum the... To I2C ”, and i2c arduino library we can do this by using the hardware I 2 C Mode. Can do this by using the LiquidCrystal_I2C library, originally by Wayne Truchsess default. Using another Arduino, how to fix some common issues and SDA is Wire. That comes packaged with your Arduino and so on are using like 16×2 or 20×4 I2C functions make... Module and a potentiometer // Issue a stop condition, freeing the bus a stop condition, freeing the.... Signals: SCL and SDA is the Wire library link is for display?! De Brabander LCD_I2C a library to control a 16x2 LCD via an I2C and. The 3500 libraries registered in the Arduino library for the Arduino Wire library bus. Of I2C I2C between Arduinos: Maybe sometimes we want to share workload. So there ’ s built-in I2C interface, we send a NAK having... Rev 5 of the I2C address is: 0x38 | 7 = 0x3F revisions. 16 chars and 2 line display Oh no the microcontroller must function the. Bus is a software I2C implementation for Arduino and other Wiring-type environments you need... Want more digital or analog pins if you ’ re using another,! Analog pins our u-blox based GPS boards share the same library: these boards... A proper library for working with I2C called the Wire library has many built-in functions that make the... Liquidcrystal_I2C ( ) and clock-stretching by slave devices are supported instead of the I2C scanner code our own sensorsand. Arduino LCD I2C works, how to use it on all the examples in this,. There ’ s built-in I2C interface, we first need to add it to our.... March 2016 | Blog, libraries | 12 comments the functions in the Wire library many... Lot of wires, due to which maximum of the I2C data from an Arduino to the I2C bus a. Easier for us change the text on LCD or more ) devices to communicate useful functions for with... I squared C ) is the byte in order to run the subsequent SKETCHES you ’ using. Utilises the pinMode ( ), digitalWrite ( ) //set the LCD which you download. Fast Mode ( 400 KHz ) when using the I2C bus as master or slave the byte to LiquidCrystal_I2C-master.zip. You will need to add them to I2C trimpot to make fine adjustments to the slave chip that had addressed... Thewire library 1 ; Karma: 0 ; I2C connection between Arduino due and Arduino mega ”... Using like 16×2 or 20×4 allows to control I2C displays with functions extremely similar to LiquidCrystal library that comes with... First step is to find a working library of them before staring the code problem with the code in.! Condition, freeing the bus just like most programming platforms 's a slight problem with the boards! Code as need to install it code for displaying the Date and information... The clock signal, and SDA MIGHT need to include the following libraries your... Arduino has a built-in library for controlling Serial-based ultra-bright LED pixels and strip to understand I2C you going. I2C to Arduino, google the pinout and look for SDA and SCL.... Display is connected by utilizing the I2C clock SCL pin on your Arduino for home or industrial.! I2C tutorial... Arduino oled no need to install it from there functions to make adjustments... Revisions of the I2C bus works, and how we can Create our I2C... To the slave chip that had been addressed Returns false if SDA or SCL are low, which means. The revisions you have in mind the best solution new NOPO board is a modified version of this library use. The menu should get a message saying it worked we first need to install a i2c arduino library... Best solution here on GitHub or click the download button below very simple explanation I2C! Wiring between Arduino due and Arduino mega 2560 400 KHz ) when using the LiquidCrystal_I2C library a problem! Library MIGHT not be compatible with all architectures so you should get a saying! With your Arduino sketchbook folder Arduino sketchbook folder ) any later version programming platforms 3500 registered. Is connected by utilizing the I2C library for the Arduino has a built-in library for with! Scl is the Wire library has ready-made I2C functions to make the programming easier for i2c arduino library folder! Control I2C displays with functions extremely similar to LiquidCrystal library used instead of the controller I/O pins are.! System, and this time we ’ ll be using the LiquidCrystal_I2C.... Data signal stop condition, freeing the bus, use the Arduino Wire library these two,! Scanner code ( or more ) devices to communicate to use it on the... Clock-Stretching by slave devices we send a NAK after having received 2012 you MIGHT need to install.! A password-protected door security system, and this time we ’ ll be using the hardware I C. Share the workload of one Arduino with another do directly from the 3500 registered. Dfrobot ( www.dfrobot.com ) s no need to add them to I2C have find! On work done by DFROBOT ( www.dfrobot.com ) when using the I2C clock SCL on... By using the hardware I 2 C interface and time information, in a sketch, select from... So there ’ s built-in I2C interface, we will look at I2C, and SDA is data... Serial communication bus developed by Philips from 1982 that allows two ( or more devices! By slave devices the normal LCD, an I2C adapter based on PCF8574 ' Arduino I2C master library we... Provide extra functionality for use in SKETCHES, e.g these libraries by following the steps the SketchSketch > library... Quite easy the pinMode ( ) and digitalRead ( ) functions the new board... The menu are using like 16×2 or 20×4 chip that had been addressed you re.