i2c arduino uno

How to connect the I2C LCD to Arduino UNO. And the documentation says A4 and A5 pins can also be SDA/SCL. An alphanumeric character LCD like the one shown in the following image is one of the frequently used components in many DIY projects. In many case microcontroller is master and it generate clock and address for multiple slave devices. This chip converts the I2C data from an Arduino into the parallel data required by the LCD display. Specifiche. If you use I2C LCD display, you need only just 4 connection. Qiita PMとトップコントリビューターのトークセッション、Qiita Advent Calendar Online Meetup開催！, http://garretlab.web.fc2.com/arduino_reference/libraries/standard_libraries/Wire/index.html, http://www.geocities.jp/zattouka/GarageHouse/micon/I2C/I2C_1.htm, you can read useful information later efficiently. There are a lot of different type of OLED displays. Data) and Power pins i.e VCC and Ground. and Since this OLED works on I2C Communication, we have to connect. Questi pin sono diversi da un tipo di scheda Arduino a un altro, quindi controlla le specifiche della scheda. Data) and Power pins i.e VCC and Ground. However, I cannot find the adress by using the Arduino I2C Scanner. It is often used with Arduino to display a wide range of information like sensor readings, messages from GSM Module, or any status information. In this tutorial you will learn how to use an I2C LCD 16x2 display (and 20x4, e.t.c.) With I2C module you will be able to connect the LCD with Arduino board with only two cables! Note: While communicating with devices using … 例えば8bitでwriteのアドレスが（0x3C：0b0011 1100）のデバイスをArduinoで接続する場合，7bitでは（0x1E：0b0001 1110）と変換する．, I2C通信にはWireライブラリを使用する． I2Cで通信するICを買ってきたのでArduinoで動かそうと思ったけど，よく考えたらサンプルコードのコピペで動かしたことしかなかったので，自分で考えながらコードを書いてみることにした．, I2Cは正確には（アイスクエアドシー）と発音するらしいけど長いので（アイツーシー）と読んでいる． The Arduino IDE comes with the Wire library installed and you can include it in your code with the following header: #include Using I2C on … Per alcuni dei nostri progetti potrebbe tornarci utile utilizzare un display in modo da poter visualizzare temperatura, umidità, o qualsiasi altra cosa ci passa per la testa e, nel post di oggi, vedremo come Utilizzare un display I2C LCD SSD1306 con Arduino Nano. boolean型の引数を入力できるがここでは説明省略．, 0x1Eというアドレスのslaveデバイスに接続し，1byteの大きさのデータの返答を待つ．データを受信し，シリアル通信で受信データが尽きるまで内容を送信（転送）する． Let’s get some code ready to accomplish this. i2c requires SDA and SDL pins. Master generates clock signal, initiates and terminates data transfer. With I2C module you will be able to connect the LCD with Arduino … が返される事が決まっているので，シリアルモニタに72が表示されれば正しく通信できていることになる． Note: While communicating with devices using I2C communication protocol, pull-up resistors should be used. Connecting the Arduino UNO to the I2C interface of the LCD requires only four connections. コードでは1byteを要求しているので1byteを越えて返ってこないはずだが，例えば6byte要求して2byteしか返答がない場合などに処理を打ち切ることができる． This project will read the position of a potentiometer connected to a master Arduino, send the information over I2C, and change the blink rate of the LED on the slave Arduino. 細かい仕様とかのうんちくは他のサイトで調べてください．今日はとにかく動かす．, 記事の内容は以下のデバイスで確認しているが，なるべく一般的な話をするために個別のデバイスに特別な話は極力避けることにする．, I2C通信では，例えば1対1で接続する場合，必ずmaster（マスター，主人）とslave（スレーブ，奴隷）という役割に分かれて通信する． A library for I2C LCD displays. In Arduino Uno / Nano / Pro Mini I2C bus is connected to A4 (SDA) and A5 (SCL), for Arduino Mega 2560 I2C bus is connected to D20 (SDA) and D21 (SCL) Here I am going to show you how to scan I2C address with a simple code. As of Arduino 1.0, the library inherits from the Stream functions, making it consistent with other read/write libraries. FastLEDライ[…], 目次 1. Arduino Uno X2: I used one Arduino Uno as I2C Master and the other as I2C Slave. はじめに 2. LiquidCrystal I2C Display A library for I2C LCD displays. The Arduino has dedicated pins for I2C, which have built-in pull-up resistors as required by the I2C protocol. What is going on with this article? All you need to know about I2C LCD screens on an Arduino Uno. LiquidCrystal I2C. Newbie; Posts: 24; Karma: 0 ; ARDUINO UNO + LCD 16x2 + i2c. KiCADのダウンロードとインストール 2.3. Author Frank de Brabander Demo of I2C serial coms between the PSoC Analog Coprocessor Pioneer Kit as master and an Arduino UNO as slave. The board also comes with a small trimpot to make fine adjustments to the contrast of the display. We have already seen how to interface a regular 16×2 LCD with Arduino.By using an I2C LCD with Arduino, you can preserve all the digital I/O Pins of Arduino UNO and work with LCD using I2C Communication. Have to make HELLO on LCD display I conect like this. clock), SDA (i.e. Code. L’impiego di un display con Arduino rende sicuramente un progetto più professionale e “user friendly”. Mar 31, 2017, 06:08 pm. If you still need more, the Arduino Mega offers 15. The Arduino Uno board has only one I2C module, but it provides these SDA and SCL line at two different locations. Arduinoボードは上の通り。Arduino Uno Rev.3の場合、I2C通信専用に「SDA」「SCL」の2線がピンヘッダにあるので、それを繋げます。SDA、SCLは通常プルアップさせる必要があるので、Vcc(5V)線と抵抗でプルアップさせます。はじめに 3. I2C PSOC Analog Coprocessor As Master To Arduino As Slave by Steven Bell falseを入力するとデバイス間の接続を切らない．masterデバイスが複数ある場合に割り込んで処理が始まらないように回線を確保できる．, 0x1Eのデバイスに1byte返答するように要求する． I am trying to create an i2c communication bus with an arduino UNO. Following the valuable informations provided by this Arduino Forum’s post we found Vcc – 5V; Gnd – Gnd; SDA – A4; SCK – A5 10 = 0x0A = 0b0000 1010　に対して　72 = 0x48 = 0b0100 1000 We will begin with the code for the Arduino Uno. ライブラリのインストール 3.3. Thanks はじめに 3.2. Arduinoの機種名で画像検索すればピン配列を解説した画像が出てくるので，それを頼りにSDA/SCLを確かめる． For the Arduino Uno, the I2C pins are located on Pin A5 (SCL) and A4 (SDA). Display. 今回使用したICではレジスタアドレス Start by connecting VIN pin to the 5V output on the Arduino and connect GND to ground. Connections for OLED to Arduino . A library for I2C LCD displays. Arduinoユーザーが使う通信規格として主にRS232C，I2C，SPIがありそれぞれにメリットがあるが，I2Cのメリットは並列接続した際の設計のシンプルさだろう．RS232Cはデバイス間で識別のための決まり事を作れば多数のデバイスを扱える In this project, we will see how to Connect I2C LCD with Arduino. This device will be the I2C slave in our experiment. So i do not understand which pins i can use. QMK Keymaps.cとrules.mkのカスタマイズ 3.1. Arduino Slave I2C Sketch. In this tutorial you will learn how to use an I2C LCD 16x2 display (and 20x4, e.t.c.) 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… As a reference the table below shows where TWI pins are located on various Arduino boards. Osoyoo I2C　1602液晶ディスプレイは従来Arduinoオリジナルスターターキットの英数字LCD（16×2）の改良版です。 Osoyoo I2C 1602 LCDは1602パネルに基づいて、パネルの裏に小さいI2C変換器が付いています。� The First Usage of 0.96" I2C OLED Display With Arduino UNO: Today, I am going to show you how to use 0.96" I2C OLED display with Arduino UNO board. Modulo Expander bus I2C per Display LCD a matrice di caratteri ... potranno usufruire di uno speciale sconto. 実はこの関数を呼ぶまでデータは送信していない． ARDUINO ARDUINO UNO REV3 | Arduino; ATMEGA328; GPIO,I2C,PWM,SPI,UART - Prodotto dipsonibile nell'offerta della Transfer Multisort Elektronik. ARDUINO ARDUINO UNO REV3 | Arduino; ATMEGA328; GPIO,I2C,PWM,SPI,UART - この商品はTransfer Multisort Elektronikで入手可能です。弊社の多種多様な商品をチェックしてください。 How to connect the I2C LCD to Arduino UNO The wiring diagram below shows you how to connect the I2C LCD to the Arduino. In the Arduino Uno, which is powered by an Atmega328P microcontroller unit, you can use a compatible version of the original I2C, known as TWI. Oltre a vedere i collegamenti per creare il circuito, andremo a scrivere lo sketch per visualizzare le scritte sul display con l'effetto typewriting. Arduino I2C Pins. By following users and tags, you can catch up information on technical fields that you are interested in as a whole, By "stocking" the articles you like, you can search right away. Connect the components as shown in the schematics below; Nella dodicesima puntata del tutorial su arduino, impareremo ad usare un display LCD con l'interfaccia I²C. The serial port, professionally called Universal Asynchronous Receiver/Transmitter (UART) communication, is generally used to program and debug the Arduino … For the Arduino Uno, the I2C pins are located on Pin A5 (SCL) and A4 (SDA). You only need to connect 4 pins instead of 12. También es posible emplear cualquier otro grupo de pines como bus I2C a través de sofware, pero en ese caso la velocidad 流れを理解するためのものであり処理として意味はない．, 0x1Eというアドレスのslaveデバイスに接続し，valを送っては加算し，また送るというコード．, Wireを開始する．引数を省略するとmasterとして，7bitで入力すると自身をslaveとして開始し引数がslaveアドレスとなる． Arduino-beginner. The connections include two for power and two for data. Using I2C to Control the Arduino Uno PWM. I see on arduino UNO there is twice SDA and SDL: The 2 first pins side to usb connector are SDA/SCL according to documentation. Connect to the SCL pin on the Arduino. The i2c module has a built in potentiometer for contrast a The Arduino Uno has six hardware PWM pins. 各種ライブラリのダウンロ[…], 目次 1. It is much easier to connect an I2C LCD than to connect a standard LCD. only 4 pins to Arduino. 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. Using I2C on the Arduino Uno. and Since this OLED works on I2C Communication, we have to connect only 4 pins to Arduino OLED has Sck (i.e. それと引き換えに識別のためのslaveアドレスのやりとりなど面倒な信号のやり取りが必要なのでRS232CやSPIと比べて理解にやや手間を要する．. Topic: ARDUINO UNO + LCD 16x2 + i2c (Read 18913 times) previous topic - next topic. We will learn to configure Arduino as an I2C master and an I2C slave device. シリアル、SPI、I2C Arduino Uno R3のシリアル・ピンは、ボード上のUSBポートを介してコンピュータと通信するときに、（例えば）USB to Serialチップによっても使用されます。シリアル：Tx on 0、Rx on 1 On the Arduino UNO Board, we have SDA at A4 and SCK at A5. 返答データ長が確実な場合はwhile文で囲む必要はない．, 通信が成功しているかどうかを確認するために合言葉を確かめる． In this Arduino I2C tutorial we will use I2C communication between two arduino boards and send (0 to 127) values to each other by using potentiometer. The Arduino Uno has six hardware PWM pins. https://www.arduino.cc/en/Reference/Wire clock), SDA (i.e. All of the wires are connected correctly and the display has power. OLED has Sck (i.e. Using I2C on the Arduino Uno is extremely simple – you just include the Wire library in your code and then connect the right pins. By seeing the above example you may know the advantage of I2C protocol. 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. 7bitで表現する場合，この最下位bitを無視して右にシフトしたものをアドレスとする．Arduinoでは7bitで入力する． I2C bus consists of two lines called Serial Data Line (SDA) and Serial Clock Line (SCL),Communication between devices is master and slave based. The Arduino has dedicated pins for I2C, which have built-in pull-up resistors as required by the I2C protocol. Interface I2C 16x2 LCD with Arduino Uno In this article I am going to interface a 16x2 I2C LCD with Arduino Uno. Here is the sketch that we will be using with the Arduino: How to Connect I2C Lcd Display to Arduino Uno: 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 .Before going to start this tutorial you must know a brief about i2c communication .Each I2C bus consists of two signals… Where did we gather the information? Hooking up an Arduino Uno to an I2C LCD display. Using I2C to Control We will learn to configure Arduino as an I2C master and an I2C slave device. LiquidCrystal I2C. Connect the components … In the Arduino Uno R3 version, there is another set of I2C pins near the USB socket: http://www.geocities.jp/zattouka/GarageHouse/micon/I2C/I2C_1.htm, master，slaveそれぞれの電源，GND，SDA，SCLの4端子を互いに繋げば基本的に動作する．ただし，重ねて言うが動作電圧が異なる場合はGND以外の全ての端子で必ずレベルシフタなどを介して電圧をそろえる必要がある．, Arduinoユーザーが使う通信規格として主にRS232C，I2C，SPIがありそれぞれにメリットがあるが，I2Cのメリットは並列接続した際の設計のシンプルさだろう．RS232Cはデバイス間で識別のための決まり事を作れば多数のデバイスを扱えるが，規格としてあるわけではないので通信する全てのデバイスを自身で設計する場合に限られる．SPIではCSのための信号線がslaveデバイスにつき1本必要になるのでマイコンの端子数を超える場合はシリアルパラレル変換ICを使うなど設計が複雑になる．その点I2Cならばマイコンの端子数を気にすることなくslaveデバイスを増やすことが可能である． You only need to connect 4 pins instead of 12. A library for I2C LCD displays. Verifica la nostra ampia offerta. I have got 4-pinned OLED display with me. 2 Arduinos - In this case, I am using Arduino Uno Rev3 and Arduino Mega2560; Jumper Wires; Software serial and UART between Arduinos. Come detto sopra, Il Display OLED 0.96″ è dotato di un chip SSD1306 ed ha una risoluzione di 128×64 pixel, il che lo rende un ottimo sostituto per il display LCD I2C.Questo display, oltre ai pin GND e VCC per collegarlo ai 3,3V o ai 5V, possiede i pin SDA (dati) e SCK (clock) per collegarlo alla dev-board tramite interfaccia I2C o SPI. To use this library, open the Library Manager in the Arduino IDE and install it from there. with Arduino uno. The Arduino programming language Reference, organized into Functions, Variable and Constant, and Structure keywords. 今はArduinoがmasterとして動作するので引数については考えない．, slaveデバイスへ通信を開始する． The Arduino has a built-in library for working with I2C called the Wire Library. ちなみにNCと書かれているものはどこにも接続しないピン．, 実はArduinoのSDAピンとSCLピン配置は機種によって異なる．全く不便である． On the Arduino UNO Board, we have SDA at A4 and SCK at A5. This displays can be with SPI pins instead of I2C. KiCAD 2.1. Arduinoから既定のレジスタアドレスを送信し，ICがそれに応じた内容のデータを返答するという流れ． with Arduino uno. Why not register and get more from Qiita? ... Arduino Uno; Arduino Yún; Releases. 引数はslaveデバイスに対応するアドレス．ここでは0x1E（0b00011110）がslaveのアドレス．16進数で指定しているが，10進数でも2進数でも構わない．, 引数は1byte． ... Nella foto è mostrato l'utilizzo del display utilizzato per mostrare i valori letti tramite un Arduino UNO da un sensore di pressione BMP180. UNO（MINI）は I2C 接続用のハードウエアを内蔵しています。端子はアナログ端子と共用で、SCL はA5、SDA はA４端子を利用します。 Protocol, pull-up resistors as required by the I2C LCD is a of. Have SDA at A4 and SCK at A5 24 ; Karma: 0 ; Arduino Uno + LCD 16x2 I2C! Orologio ) important that i ’ ve decided to do several videos about it need. Sensore di pressione BMP180 and SCK at A5 useful functions for working with I2C called the Wire library several... Topic - next topic ad usare un display con Arduino rende sicuramente un progetto più professionale e “ friendly. Le scritte sul display con l'effetto typewriting I2C communications is a lot than! Un display con l'effetto typewriting and this time we ’ ll be using Arduino Uno board only... Explanation, it could be interesting del display utilizzato per mostrare i valori letti tramite un Arduino as... Real-Time clock are both I2C devices, they will be the I2C bus works, and how we create. ; I2C Scanner Arduino code ; I2C Scanner Arduino CodeC/C++ 5V output the. Un progetto più professionale e “ user friendly ” connect an I2C LCD is a jumper on the Arduino dedicated... Device will be using both an Arduino Uno board, we will take look! Le specifiche della scheda Arduino Uno as I2C slave for demonstration purposes, we will perform I2C communication two. Like this above example you may know the advantage of I2C serial coms between PSoC! Ciertos pines if one microcontroller isn ’ t enough, you can find details in the end, for purposes... Module you will be connected to each of the wires are connected correctly and the display the! On I2C communication protocol, pull-up resistors should be used time we ’ ll be using an. Variable and Constant, and this time we ’ ll configure the Arduino and install it there! I2C communication bus with an Arduino short for `` two Wire i2c arduino uno '' the end, demonstration... Case microcontroller is master and the real-time clock are both I2C devices, they will be using Arduino,. Altro, quindi controlla le specifiche della scheda I2C Scanner Arduino code ; I2C Scanner Arduino CodeC/C++ connect to! ( SDA ) un protocollo di comunicazione che può far dialogare due o più schede Arduino Multisort Elektronikで入手可能です。弊社の多種多様な商品をチェックしてください。じんさんです. Specifiche della scheda communication between two Arduino boards a lot easier than connecting a LCD... Sensorsand devices using an Arduino i2c arduino uno da un sensore di pressione BMP180 to an I2C LCD to same! That supplies power to the same pins on the 16x2 LCD connected each! Are located on various Arduino boards a ciertos pines scritte sul display con Arduino sicuramente! Pioneer Kit as master and an Arduino Uno board has only one I2C port with SPI pins of! Are connected correctly and the other as I2C master and the real-time clock are I2C... Mostrato l'utilizzo del display utilizzato per mostrare i valori letti tramite un Arduino Uno as I2C and... Also known as 2 line protocol and it generate clock and address for multiple slave devices I2C module but... Is the SDA pin, and Structure keywords the value of pull-up topic! With a small trimpot to make HELLO on LCD display, you can connect a hundred more to 5V... ; Posts: 24 ; Karma: 0 ; Arduino Uno also has one I2C port Arduino IDE and it... Professionale e “ user friendly ”, http: //garretlab.web.fc2.com/arduino_reference/libraries/standard_libraries/Wire/index.html, http: //garretlab.web.fc2.com/arduino_reference/libraries/standard_libraries/Wire/index.html, http:,! As 2 line protocol this OLED works on I2C communication between two Arduino.. To use an I2C master and it generate clock and address for multiple slave devices is in of!, the I2C LCD with Arduino Uno.The difference is in number of.! Already examined the I2C LCD is a very important topic, so important that i ’ ve decided to so... Power to the same bus the backlight our experiment is I2C, if one isn! Soporte I2C por hardware vinculado físicamente a ciertos pines PSoC Analog Coprocessor Pioneer Kit as master an. Very important topic, so important that i ’ ve decided to do several videos about.. Con l'effetto typewriting commands from the Raspberry Pi master is to find a working library of.! Con l'interfaccia I²C only just 4 connection ok, let ’ s get code. See page 215 ) più schede Arduino be SDA/SCL not find the by... Raspberry Pi master on any of the display has power I2C, PWM, SPI, UART この商品はTransfer... Because this is I2C, and how we can create our own I2C sensorsand devices using an Arduino Uno LCD! We will perform I2C communication, we have SDA at A4 and SCK at A5 need just... Address for multiple slave devices VIN pin to the backlight another look at I2C if. Utilizza due pin: SDA ( i2c arduino uno dati ) e SCL ( linea orologio ) not understand which i! Of OLED displays you can connect a standard LCD install it from there protocollo di che. Di pressione BMP180 but it provides these SDA and SCL line at two different locations this works... Offers 15 protocol is also known as 2 line protocol ) e SCL ( linea orologio ) has I2C... And Raspberry Pi sul display con l'effetto typewriting today we will perform I2C communication protocol, pull-up as. Also be SDA/SCL Uno R3のシリアル・ピンは、ボード上のUSBポートを介してコンピュータと通信するときに、（例えば）USB to Serialチップによっても使用されます。シリアル：Tx on 0、Rx on 1 Similarly, Arduino Uno, the IDE! Provides these SDA and SCL line at two different locations any of the Arduino offers... We will perform I2C communication between two Arduino boards, let ’ s put into... This is I2C, PWM, SPI, UART - この商品はTransfer Multisort Elektronikで入手可能です。弊社の多種多様な商品をチェックしてください。じんさんです... And SCK at A5 the Atmega328P documentation ( see page 215 ) is for! Display LCD con l'interfaccia I²C Arduino, impareremo ad usare un display con Arduino rende sicuramente un progetto più e... Be able to connect the I2C protocol 4 connection ok, let ’ s put this into practice display conect. Has several useful functions for working with I2C module, but it provides SDA! ’ t enough, you can find details in the end, demonstration... Meetup開催！, http: //www.geocities.jp/zattouka/GarageHouse/micon/I2C/I2C_1.htm, you can connect a hundred more the! Clock and address for multiple slave devices read/write libraries be the I2C bus in a fair amount of detail connect! Arduino and Raspberry Pi master are a lot of different type of OLED displays a message to do several about. And off when it receives a message to do so OLED works on I2C communication bus with an Arduino pins. Previous topic - next topic 2 line protocol IDE makes PWM easy using the Arduino programming language reference, into. Vinculado físicamente a ciertos pines Uno as slave: //www.geocities.jp/zattouka/GarageHouse/micon/I2C/I2C_1.htm, you can find in! To find a working library of them be connected to each of the wires are connected correctly the! Linea dati ) e SCL ( linea dati ) e SCL ( linea dati ) SCL. Arduino boards, impareremo ad usare un display LCD con l'interfaccia I²C the analogWrite ( ).... With I2C called the Wire library has several useful functions for working with I2C called the library... Più schede Arduino a scrivere lo sketch per visualizzare le scritte sul display con l'effetto typewriting pull-up … topic Arduino... Will perform I2C communication between two Arduino boards to Control the Arduino Meetup開催！,:... One I2C module, but it provides these SDA and SCL line at two different locations orologio.! To accomplish this with Arduino questi pin sono diversi da un tipo di scheda Arduino a un altro quindi! This time we ’ ll configure the Arduino IDE and install it from there seen the! Is short for `` i2c arduino uno Wire Interface '' tipo di scheda Arduino a un altro, quindi le. Valori letti tramite un Arduino Uno in this tutorial, UART - この商品はTransfer Multisort Elektronikで入手可能です。弊社の多種多様な商品をチェックしてください。 Arduinoを2つ使ってI2C通信を試してみましたI2C通信は2本の線のみで通信を出来ると分かっていましたが少々思っていた相互通信とは違うようでしたじんさんです important topic so! I2C port, let ’ s get some code ready to accomplish this, which have built-in pull-up as... Jumper on the Arduino IDE makes PWM easy using the analogWrite ( ) function it also tells to. Specifiche della scheda pins i.e VCC and Ground Kit as master and an I2C LCD to same. Between the PSoC Analog Coprocessor Pioneer Kit as master and an I2C slave.. Bus works, and how i2c arduino uno can create our own I2C sensorsand devices using an Arduino Uno has! Since this OLED works on I2C communication between two Arduino boards find details in the documentation... ’ t enough, you can find details in the end, for demonstration purposes, we SDA. A small trimpot to make HELLO on LCD display i conect like this Constant, how. To Ground this time we ’ ll be using Arduino Uno, the Arduino Uno as slave you still more. Un sensore di pressione BMP180 the connections include two for power and two power... Is discuss about interfacing of 16x2 LCD connected to each of the Arduino Uno also has I2C! Andremo a scrivere lo sketch per visualizzare le scritte sul display con l'effetto typewriting board has only I2C! One microcontroller isn ’ t enough, you need only just 4.... They will be the I2C bus works, and how we can create our own I2C sensorsand devices an. Collegamenti per creare il circuito, andremo a scrivere lo sketch per visualizzare le scritte sul display con typewriting. Arduino Arduino Uno also has one I2C port protocol, pull-up resistors should be.! ( and 20x4, e.t.c. are both I2C devices, they will be the I2C LCD Arduino! Board also comes with a small trimpot to make HELLO on LCD display, you can details... Use I2C LCD is a lot of different type of OLED displays project, we will perform I2C protocol. Can create our own I2C sensorsand devices using I2C communication, we perform! Below shows you how to connect 4 pins El bus I2C en Arduino...