I2c Library Arduino


1 Also in the Motorshield library as well as it's underlying PWMServoDriver library, I had to force it to use the correct I2C channel. So you should start at the very beginning, and tell us what LCD you are trying to use. They're great for showing (readable) information, but the downside is that they tend to be fiddly to wire up. It starts by loading all of the libraries we just spoke of, along with the Arduino Wire Library to communicate via I2C. Such raw data can be read from the main microcontroller unit (for example Arduino, Raspberry Pi, ESP8266) using I2C communication protocol. Arduino i2c LCD PCF8574T kullanımı Merhaba arduino ile i2c lcd (PCF8574T) iletişim kurmayı anlatıyorum // Move original LiquidCrystal library elsewhere, copy. For all of the different kinds of small OLED monochrome displays, you'll need to install the Arduino libraries. Skip to content. but I'll open another topic for that if need be. The code is written primarily to support the Arduino/Wiring implementation, but it may be useful in other circumstances. This can be done by drilling a hole on a board as shown by user Renate-USB of the Arduino community. Download and Install the Library attached. 96" IIC I2C Communicate for arduino Enjoy Free Shipping Worldwide! Limited Time Sale Easy Return. Step 1: Download your library zip file example Keypad. TinyGPS++ is a new Arduino library for parsing NMEA data streams provided by GPS modules. All functions of the regular LiquidCrystal Library are supported (I think). h and an assembler module i2cmaster. cpp - a wrapper class for TWI/I2C Master library for the ATtiny on Arduino 1/21/2011 BroHogan - brohoganx10 at gmail dot com **** See TinyWireM. Codebender includes a Arduino web editor so you can code, store and manage your Arduino sketches on the cloud, and even compile and flash them. This is a library for driving LiquidCrystal displays (LCD) by using the I2C bus and an PCF8574 I2C adapter. I2CIO Arduino Library. Tags: arduino, i2c, microcontroller, MSP430, port expander trackback. Arduino IDE in the Cloud. I2C, or Inter-Integrated Circuit, is a chip-to-chip protocol for communicating with low-speed peripherals. Here is the sketch that we will be using with the Arduino:. There are many ways of Linking them such as. Cut the folder in your desktop then go to your folders then locate the arduino folder>> libraries then paste it there. Tthis project is going to show you how to make Bluetooth led control with lcd beside the Arduino sowing the new led status. For the basic structure of an Arduino program see page 7 of Arduino Programming Notebook by Brian Evans The 1 Hz output from the Ds1307 has been connected to digital pin 2 in order to update the output to once a second. Please use the same method to add other libraries then. In this example, two boards are programmed to communicate with one another in a Master Reader/Slave Sender configuration via the I2C synchronous serial protocol. The most exciting part of the Hookup Guide is the SparkFun ADXL345 library we've put together for you. The hardware itself is fine (Arduino Nano and a 32 kB EEPROM), using the EEPROM1024 and Wire libraries I can happily read and write. Can somebody point me to docs on the full suite of commands commonly available for these LCD units in the Arduino Newliquidcrystal_1. i2c I²C LCD. Now these I2C LCD's consist of 2 parts usually an HD44780 16×2 LCD and an I2C backpack which connects to the LCD exposing the standard power and I2C pins. i About the Tutorial Arduino is a prototype platform (open-source) based on an easy-to-use hardware and software. PIC MCU is connected (SCL, SDA pins) to 24c02 EEPROM. There are many ways of Linking them such as. begin(int sda, int scl), i. It provides high quality OLED screen to the newest Arduino platform. On an Arduino, connect the SDA pin to pin A4 and SCL on pin A5. In this tutorial, we'll show how to connect the LinkIt 7697 with a 1602 I2C LCD display module (with PCF8574A built-it) and give examples about how to use the library to drive it. Adafruit made a library and some sample code available on Github, just google for it or follow the download link to our server for. Arduino and Genuino boards to share information with each other. Recently, I have shared the GSM Library for Proteus, which was really appreciated by the readers so I got quite excited and have designed another new Proteus Library. First we need to download the library of the display, which includes all required functions to configure and write on the 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. Here is an example code of a simplest engine RPM indicator, which uses the pin 13 LED (built in every Arduino board) to indicate whether the engine is above 3000 rpm. Program I2C with AVRIn this instance, you use arduino uno. With I2C module you will be able to connect the LCD with Arduino board with only two cables! The i2c module has a built in potentiometer for contrast adjustment. I decided to start by. We'll show you how to wire the display, install the library and try sample code to write text on the LCD: static text, and scroll long messages. Values will be displayed on the 16x2 LCD connected to each of the Arduino. What is an Arduino library? It is just a file with pre-programmed functions that will help you manipulate the hardware with much ease. These sounds can be quickly and easily constructed from familiar synthesis units like oscillators, delays, filters and envelopes. In this tutorial, we will use I2C bus for communication between Arduino and STM32F103C8, and will learn about SPI bus in next tutorial. " The more technical answer is - be prepared to install a new library and learn a bit about digital electronics. We are using a 0. It allows one master device to connect to a large number of slave devices using only 2 pins (signal and clock). Everything is written for the old LiquidCrystal library. Location: Home » Arduino Kits » Arduino Ultimate Kit » Arduino lesson – I2C OLED Display. ZIP Library… in the Arduino IDE. It is possible to use two devices with identical addresses on an I2C bus, but that will be discussed in a later article. 1) Arduino due internal real time clock RTC to be used as date and time display. Unlike the RTC library that you added manually, it’s included as a standard library in the Arduino software distribution. For example, capacitive sensing takes difficult timing and pulsing of digital pins. 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. ARDUINO MPU 6050 – BEST IMU SENSOR TUTORIAL From: Arvind Sanjeev, Founder DIY Hacking Arduino MPU 6050 Tutorial In this post, I will be reviewing a few basic IMU (Inertia Measurement Unit). If you can detect the i2c communications stall, you can try resetting it with this:. Introduction. begin(int sda, int scl), i. SDA - SDA Pin of Arduino (mentioned in the backside of Arduino) SCL - SCL Pin of Arduino (mentioned in the backside of Arduino) Finding I2C Address of our backpack: First, we need to find the address of our I2C LCD Backpack. The Arduino code example we have, HMC5883. You should use the MPU that you have more experience with. 20x4 character alphanumeric I2C OLED shield for Arduino MKR series. PololuHD44780: C++ library for the Arduino IDE that allows you to control an LCD that uses the Hitachi HD44780. The sensor communicates via I2C communication protocol, which means that wiring is very simple, you just need to connect the sensor to the Arduino I2C pins. Location: Home » Arduino Kits » Arduino Ultimate Kit » Arduino lesson – I2C OLED Display. The code is written primarily to support the Arduino/Wiring implementation, but it may be useful in other circumstances. These days, they does not cost huge. You will then see the I2C address of the module. The Wire Library is a series of files in plain text that exist in the. MATLAB ® Support Package for Arduino ® Hardware includes the I2C library, which creates an interface to communicate with I2C devices. Fast and free shipping free returns cash on delivery available on eligible purchase. The Arduino software includes a Wire library to simplify use of the I2C bus and the SPI library for the SPI communication. g if arduino wants to send some string to PI. Interfacing Arduino with BMP280 sensor code: To simplify the code of this project I used a library for the BMP280 sensor provided by Adafruit Industries. Arduino Robot Library. resource component for AmigaOS 4. x or the shared library i2c. The Arduino address is the same as our address, but shifted right by 1 bit. But you'll waste about 8 Pins on your Arduino for the display to get working. Step 1: Open Arduino IDE, click Sketch-> Include Library-> Add. You would think that all of these modules would come with some indication of what the I2C address is. Installing the LiquidCrystal_I2C Arduino library. It used to be a little confusing to add libraries to the Arduino IDE with old versions of the IDE, they have just made it way simpler than what it was. This is an example code how to use the. Arduino Stack Exchange is a question and answer site for developers of open-source hardware and software that is compatible with Arduino. To download the source from Github instead, click "Clone or download" above, then "Download ZIP. MCP4725 i2c DAC Arduino Interface. This interface is sometimes called TWI (Two Wire Interface). After you have acquired the I2C address of the module, display something on your screen using the sketch below. PMW3360 Module: This library allows an Arduino/Genuino board to interface with PixArt PMW3360 motion sensor module. Download I2C LCD Arduino Code and Library Procedure. Custom Character Creator by Druno Maia LiquidCrystal can use 8 all data pins. On the Arduino Uno they are found on Analog pins A4 and A5. This IC can control until 16 digital devices like button or LED with only two pins. I2C LCD Backpack. In the setup() function we have Wire. I2C stands for Inter-integrated circuit. Here’s the wiring diagram: Another option is to use the u8glib library, a versatile library that covers almost all monochrome LCDs and OLEDs. This is where timers and interrupts come in to play. Library Installation. Even a library that just handles the menu system? I can take care of the output myself. We will begin with the code for the Arduino Uno. Apart from serial communication the Nano board also support I2C and SPI communication. I2C itself is also an issue, because u8glib (and most other libs) do not support I2C. I am trying to install and use an Arduino program onto a system I am building. One drawback to the parallel connection is that it requires 8 digital pins for the connections. Hello every one ! welcome back ! It’s nice to show you my new tutorial after long time. Cut the folder in your desktop then go to your folders then locate the arduino folder>> libraries then paste it there. Before using I2C, pins for SDA and SCL need to be set by calling Wire. Does anyone know where I can find this?. The name of this library is Liquid Crystal I2C. I went to the trouble of tweaking the Arduino 'Wire' library to avoid enabling the AVR pullups (it's a shame this is not an option in the library). Upload and Run the I2C Scanner Sketch. I don’t know if it was an inrush current brownout, or transient spikes, or output ripple…but for some reason the tiny stack simply will not run from this regulator – all I get is one little pip out of the on-board led and that’s it. There are many ways of Linking them such as. The link you linked at the end is for an LCD that doesn't have I2C. yes i have tried playing with the contrast. This can be done in several methods, using I2C and Serial, to list a few. Arduino Tips, Tricks, and Techniques There is not an extra I2C interface or anything, its just that they made a this is the Serial Library, which allows the. Arduino Timer Interrupts. On Wiring S board the SCL and SDA pins are: 8 and 9. You will then see the I2C address of the module. STM32 has more features than Arduino board. We will begin with the code for the Arduino Uno. The Arduino Wire Library. So it does not matter. NeoPixelBus - Arduino NeoPixel library compatible with ESP8266. Define as a pre-processor them and use Wire. Step 1: Open Arduino IDE, click Sketch-> Include Library-> Add. Hello friends, hope you all are fine and having fun with your lives. This is important, because the BlueDot library does work with two BME280 sensors on the I2C bus. I think I might have changed the c file extension to a. On this module, I2C is the data Interface by default. Hit the Run button on your Proteus software and you will get result as shown in below figure: So, now in this way, you can easily simulate any of your above mentioned Arduino boards quite easily in Proteus software using our Arduino Library for Proteus. I2C LCD Backpack. With this module, you can control an LCD display, either 16×2 or 20×4, using only two pins Arduino: the analog input pin 4 (SDA) and the analog input pin 5 (SCL) forming the I2C interface. No need of external RTC chip/board 2) Running I2C LCD display on arduino due using Arduino IDE version 1. Do you you if the WIRE library uses any of the following: timer0, timer1, timer2, int0, an or int1 ?. I am learning about i2c and the wire library and have some questions about which arduino uno resources the i2c interface uses/requires that they be available. I found no library for it, so I created a small sketch with few functions to show how the i2c_eeprom_write_page and. Arduino Robot Library. Unzip the library and add it to the Arduino libraries folder, then run Arduino IDE and copy the following code. Download and Install the Library attached. Now onto the sketch. In this example, two boards are programmed to communicate with one another in a Master Reader/Slave Sender configuration via the I2C synchronous serial protocol. com website, which now seems to be no longer with us, so we have reproduced it here. On the Arduino boards with the R3 layout (1. 2 or higher from Arduino's library manager). I'm trying to hook it up to my arduino using I2C, and I'm using F Malpartida's LCD library for I2C. Cannot even get a LED switched on. 54 (Breadboard type). Then, we read data via I²C from EEPROM and send its value to PORTB, to check if the cycle was successful (see the figure below how to interface 24c02 to PIC). Installatie van Arduino IDE libraries: Arduino info Informatie (ENG): I2C Master Interface This library consists of a C include file i2cmaster. Arduino I2C Interface. For this tutorial,it is necessary to download and install the "LiquidCrystal_I2C" library. Find this and other hardware projects on Hackster. After checking out the source code with Git into a directory on your computer, compile using the Arduino IDE. Mozzi brings your Arduino to life by allowing it to produce much more complex and interesting growls, sweeps and chorusing atmospherics. A catalogue of the 2440 Arduino Libraries. Arduino Real Time Clock DS1307 Interface. For a guide to writing your own libraries, see this tutorial. Adafruit made a library and some sample code available on Github, just google for it or follow the download link to our server for. Wiring If you already have the I2C adapter soldered onto the board, wiring is quite easy. You can then use the Wire library for Arduino. Arduino Uno R3. As like most devices, we make use of an Arduino library, in this case. DIY Arduino E-Stim Unit This blog revolves around my development of a do-it-yourself open-hardware open-source e-stim unit. If you need a baud rate other than the default 100Kbps, then you can supply this on the command-line: gpio. This is a bright and wide temperature range OLED that works below freezing, making it useful for outdoor applications. The navX-MXP Arduino Library is useful for integrating navX-MXP into Arduino-based project. [SOLVED] I2C LCD - Setup instructions for 16x2 Oct 23, 2012, 11:37 am Last Edit : Nov 16, 2012, 02:55 am by ianbren Reason : 1 Like many on this discussion group, I bought an I2C LCD device for my Arduino only to find that the documentation is either non-existent or, if it does exist, just wrong. First we need to download the library of the display, which includes all required functions to configure and write on the display. Is it possible to connect to two I2C bus using Arduino IDE (it seems that the Wire library can only support one I2C), so that I can connect two I2C devices with same I2C address in separate I2C. [image] Reference: Hello World 0. i2c I²C LCD. After downloading the library, unzip the folder. I own one of these small action cameras (SJcam SJ4000). 5 library? (Sorry to be vague on the specifics of my LCD module. After browsing lots of web pages I found an Arduino sketch to calibrate the MAG3110 and determine the heading on this blog. 96 inch SSD1306 OLED display (blue/white) for this example. code and other stuff from here :-. It used to be a little confusing to add libraries to the Arduino IDE with old versions of the IDE, they have just made it way simpler than what it was. VDD to Arduino 5V and A to Arduino 5V through 330 ohm resistor. Download and Install the Library attached. Once wired up, to start using the DS3502, you'll need to install the Adafruit_DS3502 library. I did not get specs from the vendor, so I have had to guess as to how to use it. VEE pin is used to control the contrast of the LCD. I found no library for it, so I created a small sketch with few functions to show how the i2c_eeprom_write_page and. That means you can just dump the code in the ESP8266 with your Arduino IDE and voila! Working like a champ. An example for a matrix keypad (which I have one) is here and the official Arduino library for matrix keypad is here. This is an Arduino version of my Raspberry Pi program. 1 Also in the Motorshield library as well as it's underlying PWMServoDriver library, I had to force it to use the correct I2C channel. Hardware Requirements I 2 C devices communicate with 2 signals, called SDA and SCL. MSP430 (or Arduino) Library for PCF8574 I2C Port Expander August 8, 2014 Posted by Robert Harder in Utility. But the SSD1306 will still be different. Devices such as the PCF8574 provide an easy way to expand both input and output capabilities using a single chip, and because it’s on i2c, needs only two pins from the Arduino (SDA and SCL). Hi I am using this I2C scanner code on the ARDUINO TYPE IDE for GR Lychee board. Use the "NeoPixelAnimator" branch for ESP8266 to get HSL color support and more. 1 is the Master and 2 or more are slave this master and slave can be program to send 6 byte of data every half second to a uniquely addressed slave. VEE pin is used to control the contrast of the LCD. The code we have is for any kind of Arduino, if you're using a different microcontroller, the code is pretty simple to adapt, the interface we use is basic bit-twiddling SPI or I2C. The library and files all contain the word "wire" because Atmel (the chip at the heart of the Arduino) devised a system called "Two Wire Interface" or "TWI" which is their flavor of I2C. h header file if the default Arduino "Wire. Interfacing Arduino with I2C LCD code: In this interfacing I used a small library named LiquidCrystal_I2C (LiquidCrystal_I2C. We'll configure the Arduino as an I2C slave, accepting commands from the Raspberry Pi master. You can scan and find the i2c address used by your devices by find the exact address used by the i2c device for more detail how i2c works please see this link, before we will going to begin you need to have the Arduino IDE and the source code sketch, the code below will scan and find the address which has been used. I did not get specs from the vendor, so I have had to guess as to how to use it. The name of this library is Liquid Crystal I2C. 3V operation you can power your project from lithium battery. Ssd1327 arduino i2c. Step 1: Open Arduino IDE, click Sketch-> Include Library-> Add. Check that the Adafruit_SSD1306 folder contains Adafruit_SSD1306. Construction & Working. Connect the components as the circuit attached. We fixed a function in. Because of its small dimensions and the ATmega328 I ordered an Arduino Nano - More…. I dont know if its "another" because I dont know if someone here already made one which is good news so they can share their expertise, I hope. On most Arduino boards, SDA (data line) is on analog input pin 4, and SCL (clock line) is on analog input pin 5. Upload this sketch and the serial monitor in the IDE. The library is available through the Arduino library manager so we recommend taking that approach. The particular IC this was written for is the 24LC256. 13 追記: コンストラクタ引数でI2Cスレーブアドレスを設定出来るようにしました。. and now the folder liquidcrystal and DHT11 library is already in the arduino ide libraries. It work like a charm , after i've recompiled the wire library (it wasn't working correctly I dont know why). Before you can use the SSD1306 OLED screen, you will have to configure the port on which it is located. Hello all, December 2, 2018:: As below see github for the latest download and details - the ZIP below is old … This thread details an enhanced I2C library for the Teensy 3. This I2c library is implemented as a compact assembler software implementation of the I2C protocol which runs on any AVR (i2cmaster. It’s used for getting the time from the RTC module and uses the I2C library to negotiate that communication. Is there a simple library to talk to I2C for C++? I have found some stuff for python and Java, but I wanted C++. Use the "DmaDriven" or "UartDriven" branches. Arduino developers can use the "Wire" library. Connect the components as the circuit attached. The board can connect to Arduino Create, your own LoRa network using the Arduino Pro Gateway for LoRa, an existing LoRaWAN infrastructure like The Things Network, or other boards using P2P connectivity. 95 About us Sandbox Electronics is a studio that design electronics and sell these bits and pieces worldwide. Codebender includes a Arduino web editor so you can code, store and manage your Arduino sketches on the cloud, and even compile and flash them. Watch Video. Liquid Crystal I2C Library: I2C Pins: Arduino Uno, ProMini: A4 (SDA) A5 (SCL) Arduino Mega2560,Due: 20 (SDA) 21 (SCL) Arduino Leonardo: 2 (SDA) 3 (SCL) Category Science & Technology;. I needed a library of I2C that could communicate to multiple sensors (having same address) using a single Arduino and much to my disappointment, I couldn't find one. With I2C module you will be able to connect the LCD with Arduino board with only two cables! The i2c module has a built in potentiometer for contrast adjustment. LiquidCrystal_I2C is a library. I2C (Wire library)¶ Wire library currently supports master mode up to approximately 450KHz. Step 2: Unzip your library file. Arduino MCP4725 DAC Tutorial. Like its predecessor, TinyGPS, this library provides compact and easy-to-use methods for extracting position, date, time, altitude, speed, and course from consumer GPS devices. Library Example. SC18IS602 I2C to SPI Bridge Module for Arduino with Arduino Library 755170971710 | eBay. zip Online Manual; LCD library for HD44780 based LCD's This library can be used to access a HD44780-based character LCD module. Edit the code as need to change the text on LCD. I2C, or Inter-Integrated Circuit, is a chip-to-chip protocol for communicating with low-speed peripherals. The I2C slave access rate can be reduced relative to the Sample Rate. But you'll waste about 8 Pins on your Arduino for the display to get working. and now the folder liquidcrystal and DHT11 library is already in the arduino ide libraries. I have using the Wire library on an Arduino UNO at I2C bus rate of 100kHz and it's worked fine for my needs. I2C digispark slave of arduino to drive my digispark about my arduino uno by I2c. ESP8266 with 20x4 i2c LCD [Arduino IDE]. Now you can see the text on LCD. Right now i'm thinking abut using Arduino Nano, I will update this project and report it. Then use the function Wire. My question: How can I, in Simulink, recieve the accelerometer data? I have found out that the accelerometer uses I2C communication. In this tutorial, we will use I2C bus for communication between Arduino and STM32F103C8, and will learn about SPI bus in next tutorial. Does anyone know where I can find this?. ) to an I2C eeprom. Cut the folder in your desktop then go to your folders then locate the arduino folder>> libraries then paste it there. Hello every one ! welcome back ! It’s nice to show you my new tutorial after long time. Wire Library This library allows you to communicate with I2C / TWI devices. Location: Home » Arduino Kits » Arduino Ultimate Kit » Arduino lesson – I2C OLED Display. Output pin of MCP4725 is connected. Find the I2C port on which the SSD1306 screen is connected. Hardware Requirements I 2 C devices communicate with 2 signals, called SDA and SCL. This file will hold our read and write functions. LiquidCrystal_I2C. For the latest news and developments, please see the Wiki in the Arduino playground. begin(int sda, int scl), i. however I found no updated arduino-library in short time. x and MorphOS 3. Necessity is the mother of invention, so he put together this I2C sniffer sketch for Arduino. h" is not available or preferable for any reason. Hello every one ! welcome back ! It's nice to show you my new tutorial after long time. Edit the code as need to change the text on LCD. Learn how to use an LCD with I2C ASAP. The row of pins is attached to the same row of pins on any HD44870-compatible LCD. If you visit the LiquidCrystal reference page on the Arduino. The nice folks at Arduino have made this very easy with the Wire library. Computers & Accessories. Values will be displayed on the 16x2 LCD connected to each of the Arduino. h libraries when using with an Arduino Uno/Mega/Nano. Now that we know our displays i2c address, we can open the example sketch in our adafruit ssd1306 library. Both of these libraries are already included in your Arduino IDE. Cut the folder in your desktop then go to your folders then locate the arduino folder>> libraries then paste it there. 7 thoughts on “ A Better USI I2C Library For The MSP430 ” cn says: February 2, 2014 at 1:03 pm I’ve tried to do this, as well as use ti’s lib. Hello all, December 2, 2018:: As below see github for the latest download and details - the ZIP below is old … This thread details an enhanced I2C library for the Teensy 3. The DS1307 resets the I2C bus when Vcc is removed which helps to over come this problem. i2c I²C LCD. A SoftwareSerial library allows for serial communication over any of the digital pins. The last step is to create the server which is listening on port 80. We will, however, be using the Arduino Wire library for I2C, as well as the Servo Library. The Driver is based on Adafruit Arduino library, I ported the code to be able to compile and run on Raspberry Pi but added also some features. Download the code. Introduction. This is the I2C LCD "backpack" I was referring to: At the center of the board is the PCF8547 controller by NXP. Hi, There are a lot of I2C libraries for Arduino on internet but there is one problem - none of them supports multiple I2C to communicate to devices simultaneously. VEE pin is used to control the contrast of the LCD. I'm using a level shifter for the 5v i2c between the Rpi and the Arduino. An example for a matrix keypad (which I have one) is here and the official Arduino library for matrix keypad is here. 54 (Breadboard type). 96 inch SSD1306 OLED display (blue/white) for this example. 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. Change the address of the display to whatever the scanner told you, in my case 3x0C. VDD to Arduino 5V and A to Arduino 5V through 330 ohm resistor. The library allows to control I2C displays with functions extremely similar to LiquidCrystal library. In this tutorial you will learn how to use an I2C LCD 16x2 display (and 20x4, e. With Raspberry Pi and I2C communication, we can connect the Pi with single or multiple Arduino boards. It consists of a circuit board, which can be programed (referred to as. Adafruit_I2C. On most Arduino boards, SDA (data line) is on analog input pin 4, and SCL (clock line) is on analog input pin 5. I am quite new to this but unable to figure out why this all is not working. The Driver is based on Adafruit Arduino library, I ported the code to be able to compile and run on Raspberry Pi but added also some features. Installing the LiquidCrystal_I2C Arduino library. Chatting on the Arduino IRC channel, I was suggested to use a protocol such as I2C or 1-Wire. That's the point where you understand the tutorials at Arduino. One drawback to the parallel connection is that it requires 8 digital pins for the connections.