Adafruit mcp23017

The Raspberry Pi has one I2C bus and the MCP23008/MCP23017’s have a 3-bit address select port, so in-theory you can connect up 8 MCP23008/MCP23017’s giving you a GPIO capability of an additional 128 IO pins using these devices. Can you please explain in detail how I can do it with adafruit/Adafruit-MCP23017-Arduino-Library Microchip MCP23017 16-bit I2C Port Expander IC from Tronixlabs Australia Product Description The MCP23017 allows you to add sixteen inputs or outputs (in two pairs of eight) easily to any platform with an I2C interface. MCP23017 is an I/O Port Expander, uses the I²C bus and protocol. G. Once configured, you can use any of the 16 pins as pins for your projects. The also have a test python code to get it working with MCP23017. I am using a 16x2 LCD and have it connected with MCP23017 16-bit IO port expander. 8 inch touch screen from Adafruit, which is intended to be used for navigating through menus and options once the firmware is fully fleshed out. Node for node-red to interact with Adafruit and sainsmart i2c-lcd's. h" // Basic pin reading and pullup test for the MCP23017 I/O expander // public domain! // Connect pin #12 of   How to use the MCP23017 to increase your I/O by 16 pins (or more) and use its interrupt system. AceButton An adjustable, compact, event-driven button library that handles debouncing and dispatches events to a user-defined event handler. so the address for the IC is based on a strange 7 bit register. Ive allready got Blynk working for other project before so no problem to get the app working. I want to use more than 3 MCP23017-E/SP DIP28 chips so I can use many digital pins. Pin 9 connects to 5V, 10 to GND, 11 isn’t used, 12 is the I2C bus clock line (Arduino Uno/Duemilanove analogue pin 5, Mega pin 21), and 13 is the I2C bus data line (Arduino Uno/Duemailnove analogue pin 4, Mega pin 20). Functional Block Diagram GPB7 GPB6 GPB5 GPB4 GPB3 GPB2 GPB1 GPB0 I2C Control GPIO SCL SDA RESET INTA 16 Configuration/ 8 A2:A0 3 Control Registers SPI SI SO SCK CS MCP23S17 MCP23017 GPA7 GPA6 GPA5 GPA4 GPA3 GPA2 GPA1 GPA0 INTB Interrupt GPIO Serializer/ Deserializer Logic #mcp = adafruit_mcp230xx. I can get the code below working. Addressing the MCP23017. Controlled by python and the Adafruit mcp230xx library. What is really cool is that you can string the GPIOs together. MAX6675 (U3) doesn't want to work with MCP23017. I have been experimenting with I2C and the mcp23017 IO expander chip for my arduino ATMega2560 as I would rather use the IO on the arduino its self for other things I am just figuring out how to use the adafruit mcp23017. For example pin 12 corresponds to GPIOB4 on the MCP23017. ca is the perfect I/O expansion HAT for your Raspberry Pi A+/B+/2/3 etc. E. The MCP23017 is a +5V device. Adafruit used this chip in Adafruit's RGB LCD + Keypad shield to both control an LCD and read a 5-way keypad and found it to be very reliable and easy to get up and running. mcp23008 import MCP23008 #from adafruit_mcp230xx. Author: Adafruit; Website Library Type: Recommended; Architectures: Any. You can also use a MCP23017 instead of a shift register and directly address the outputs. Data is written to the MCP23017 after every byte transfer. Order today, ships today. Today we introduce a great LCD expansion shield for Raspberry Pi that allows you to create an interface to control applications without the need to constantly keep a monitor, keyboard and mouse connected. The Adafruit RGB LCD plate is a nice little display which adds 5 push-buttons to the display board, and sits on-top of the Raspberry Pi. This library implements a python 3 library for the MCP23017 port expander chip. I don't know much about electronics except for microprocessors in varisty. This is how we are able to only use 2 R-Pi pins to run the entire LCD and buttons. Never one to leave you with just a breakout board or an IC and a goodbye, Adafruit provides a library for the MCP23008 and MCP23017 in our Pi repository on github. The RGB part refers to the backlight – which, as you’ve guessed can be set to various colours by combining the red, green and blue backlights. This allows data transfer between the arduino and the I/O port expander chip. I am not claiming th Learn how to control MCP23017 I/O expander with Arduino. Has anyone tried to port the Adafruit Sous Viduino project to the Spark Core? They use several libraries like: PID_v1. January 3, 2014 AT 7:31 pm Community Corner: Fiber-Optic Horsehead Nebula Portrait, Hell Bunny, LED Strip Clocks, and Other Treats to Round Out the End of the Year in Adafruit’s Community! MCP23017 GPIO Expander python 3 Library – With Interrupts! October 15, 2014 Dan 21 Comments There are numerous python libraries out there for the 16 port MCP23017 GPIO expander chip that works with the Raspberry Pi, so why yet another one? The MCP23017 and MCP23008 integrated circuits are a great way to add more I/O pins to a microcontroller. IO Expander Bidirectional MCP23017 supports Python library which makes the usage very comfortable and easy. #include <Wire. 7MHz 28-SPDIP from Microchip Technology. The HAT features two removable MCP23017 DIP IC's, which utilise two i2c pins (which can be shared with other devices if required), and in exchange gives your Raspberry Pi an additional 32 GPIO ports! Text LCD displays are all very well, but they suffer from various limitations. If a Stop or Restart condition is generated during a data transfer, the data will not be written to the MCP23017. Note that this chip is  Since MCP23017 usesthe I2C standard, it can share the same serial line with 254 other https://github. h library and cant figure out how to address multiple mcp23017 chips and how to use there pins individually this is the code MCP23017/MCP23S17 DS20001952C-page 2 2005-2016 Microchip Technology Inc. The MCP23017 chip supports the I2C interface which could be used by the Raspberry Pi for communication. The library is a drop-in replacement for both the Adafruit LiquidCrystal Library (for the I2C backpack) and the Adafruit RGB LCD Shield Library. Adafruit Industries, Unique & fun DIY electronics and kits MCP23017 - i2c 16 input/output port expander ID: 732 - Add another 16 pins to your microcontroller using a MCP23017 port expander. We also have the SPI version of this chip here MCP23S17 The role of a GPIO expander is to add more GPIO pins to the microcontroller, the microcontroller then is interfacing with the expander using a serial protocols that requires few wires. It has 16 GPIO pins which you can control using an I2C interface using two pins from a Raspberry Pi, plus a power source and sink (which can also come from the Pi). The also have a test python code to get it working これは MCP23017 という I2C 接続のものです。秋月で 110 円。SPI のは MCP23S17 で 120 円。単純に「Arduino は 1 バイトのレジスタを 3 つ持っている」と言えるのであれば、この IO エキスパンダは 1 バイトのレジスタを 2 つ持っているということができます。 MCP23017 Interrupt Tutorial. Raspberry Pi with four MCP23017 and 64 LEDs Ian Cole. The 16-bit I/O port functionally consists of two 8-bit ports (PORTA and PORTB). This is easily installed from   Adafruit MCP23017 Arduino Library. Allied Stock #: 70928430. Adafruit MCP23017 - i2c 16 Input/Output Port Expander [ADA732] $7. Contribute to adafruit/Adafruit-MCP23017-Arduino-Library development by creating an account on GitHub. 714 - Adafruit Industries LLC | 1528-1451-ND DigiKey Electronics   Oct 15, 2014 Lastly, you'll need a python 3 port of Adafruit's I2C library, which I have included as part of the BitBucket repository. Adafruit  MCP23017-E/SP – I/O Expander 16 I²C 1. Email me with questions. it/r6A). MCP23017(i2c, address=0x21) # MCP23017 w/ A0 set # Now call the get_pin function to get an instance of a pin on the chip. So I studied what I could find on the web. h but the current IDE did not like that and why does Wire. This is a library for the MCP23017 I2c Port Expander These chips use I2C to communicate, 2 pins required to interface Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit! Written by Limor Fried/Ladyada for Adafruit Industries. . These chips use I2C to communicate, 2 pins required to interface. NC is Not Connected. Pricing and Availability on millions of electronic components from Digi-Key Electronics. This page is all about how to use multiple MCP23017 interrupts. h Adafruit_MCP23017. Sphinx documentation Sphinx is used to build the documentation based on rST files and comments in the code. The operation is ended with a Stop (P) or Restart (SR) condition being generated by the master. Library for the MCP23017 I2C Port Expander. By replacing either of Adafruit’s libraries with LiquidTWI2 Adafruit Accessories Adafruit Accessories are available at Mouser Electronics. USA - ENG. The MCP23017 uses two i2c pins (these can be shared with other i2c devices), and in exchange gives you 16 general purpose pins. The MCP23017 is an I/O expander chip. You can add up to 128 I/O, 16 per chip. Both “byte writes” and “sequential writes” are Contribute to adafruit/Adafruit-MCP23017-Arduino-Library development by creating an account on GitHub. h library and cant figure out how to address multiple mcp23017 chips and how to use there pins individually this is the code The lower screen is a 2. They are used to determine the chip’s ID (000 to 111). Adafruit_MCP23017 mcp; // MCP23017 I/O expander gives 16 more WiringPi supports an extension module for the MCP23008 (8-bit) and MCP23017 (16-bit) I2C GPIO expansion chips. For one thing, you don't have a huge amount of screen to play with, you can't do special effects (like inverse) and you can't draw boxes and gauges. NEW PRODUCT – MCP23017 – i2c 16 input/output port expander!Add another 16 pins to your microcontroller using a MCP23017 port expander. Things are actually near ready, you simply need this kind of circuit : You can use other additional libraries like Adafruit has to make the “coding” easy : /* Exemple toggle. You can use up to 8 of these MCP23017 chips. Adafruit Industries, Unique & fun DIY electronics and kits : - Tools Gift Certificates Arduino Cables Sensors LEDs Books Breakout Boards Power EL Wire/Tape/Panel Components & Parts LCDs & Displays Wearables Prototyping Raspberry Pi Wireless Young Engineers 3D printing NeoPixels Kits & Projects Robotics & CNC Accessories Cosplay/Costuming Halloween Reseller and School Packs Internet of Things For the MCP23017 you can get a pin instance for any pin numbered 0 to 15. this means if you connect A2, A1, A0 to ground you get the slave address: 0100000 in the register which correlates to a hex value of 0x20. The MCP23017 pHAT from ModMyPi is the perfect I/O expansion pHAT for your Raspberry Pi Zero. It gives you an extra 16 I/O pins using an I2C interface as well as comprehensive interrupt control. # Author: Tony DiCola import time import board import busio import digitalio from adafruit_mcp230xx. So, first of all, you should setup different  Jan 31, 2018 For the sketch just include the Wire library and the very useful MCP23017 library from Adafruit, create an instance of Adafruit_MCP2301 and  If you are using the Adafruit MCP23017 library there is a shortcut you can use for setting all the GPIO pins in one go: mcp. The MCP23017 can be configured to operate in 8-bit or 16-bit modes. And I have made my interrupt functions more closely reflect the way the interrupt functionality is implemented in the MCP23017. [Tom] chose the 732 from Adafruit Industries at Allied Electronics & Automation. Sphinx documentation ¶ Sphinx is used to build the documentation based on rST files and comments in the code. Library for the MCP23017 I2C Port Expander   Every chip must have unique address, and this is doable according to Microchip's manual page 8. USA - ESP. SCL is the serial clock line. support for Adafruit RGB LED Shield (MCP23017-based) LiquidTWI2 also supports the Adafruit I2c Backpack (MCP23008-based) in I2C mode. 7K resistors are what are called "pull-up" resistors and they provide a weak connection to a known state (5v in this case) Without them there may be times the lines may 'float' and not work as expected. Mouser offers inventory, pricing, & datasheets for Adafruit Accessories Adafruit Accessories. 30. Using 20x4 LCD displays with the MCP23017 and Raspberry Pi Adafruit sells a nice I2C connected 16x2 LCD "plate" to go on top of the RPi that also includes a few buttons. MCP23017(i2c) # MCP23017 # Optionally change the address of the device if you set any of the A0, A1, A2 # pins. I use Adafruit-MCP23017-Arduino-Library. Re: PI4J + Adafruit LCD with MCP23017 Sun Jul 29, 2018 4:49 pm I need the whole Pi4J Java program because my crystal ball went offine in "The Great Crystal Ball Disaster" of 1989 and I can't invent Java at will now. + Adafruit MCP23017 - i2c 16 input/output port expander [ADA732] See more like this. . h> #include "Adafruit_MCP23017. be], CC-BY-SA pour tâche de traduction. Everything is on circuit please see the image. The GPB0-GPB7 and the GPA0-GPA7 pins are the 16 I/O ports. I am trying to use an LCD display with my MCP23017 IC and Arduino UNO Rev 3 board but I can't find anything about the appropriete connections. Registers in two banks or one bank and auto-increment pointer or not. This connects to analog pin 5 on the arduino. be [www. The MCP23X17 16-bit GPIO Expander Evaluation Board demonstrates simple input/output functionality of the MCP23017 (I2C interface) and the MCP23S17 (SPI interface). In this article we discuss how to use the Microchip MCP23017 16-bit serial expander with I2C serial interface. pde Utilise la librairie Adafruit-MCP23017 pour changer une sortie du MCP23017. mchobby. circuitpython-build-bundles --filename_prefix adafruit-circuitpython-mcp230xx --library_location . By adding more MCP23017s to the I²C wires, the project can use more GPIOs but each chip must have its own I²C address. adafruit. Required Hardware Arduino Board Breadboard Breadboard Jumper Cables MCP23017 Expander LEDs Resistors 470ohm The MCP23017 is a 16-bit, general purpose parallel I/O port expander for I2C bus applications. The system demonstrates the simplicity of monitoring four pins configured as inputs and applying a predetermined pattern on LEDs connected to the remaining 12 pins configured as outputs. I tried this solution but only device address with 0x00 is working. node-red-contrib-i2c-lcd-adafruit-sainsmart 0. This library could be installed form everyone on their Raspberry Pi to start programming the first program for the port expander. The MCP23017 is a port expander that gives you virtually identical PORTS compared to standard microcontrollers e. Pros: 714 – MCP23017 Character LCD 16x2 RGB Display Arduino Platform Evaluation Expansion Board from Adafruit Industries LLC. However, I’m having a problem with dependencies with the Adafruit_MCP23017 library, a new library I’ve just introduced to my project which I’ve added as PIO library. pour MCHobby. h looks OK to me and I would expect it to just identify the Wire MCP23017 are available at Mouser Electronics. We will address editing the library address so that up to 8 MCP23017 chips can be used in a future step. h PID_AutoTune_v0. That's all there is to using the MCP230xx I2C I/O extender with CircuitPython! the sixteen I/O ports are separated into two ‘banks’ – A (on the right) and B (on the left. h. You can set each of 16 pins to be input, output, or input with a pullup. 3. Using MCP23017 to control Servos. Adding an MCP23017 I/O Extender to Arduino or ESP8266: UPDATE Okt Using a library, such as the one from Adafruit, makes it much easier though as it has  Mar 13, 2017 Adafruit developed a Python library which could be used together with MCP23017 chip. This 28-pin IC offers sixteen inputs or outputs – and up to eight of the ICs can be used on one I2C bus… offering a maximum of 128 extra I/O ports. 0. These correspond to the GPIOA0 to GPIOA7, then GPIOB0 to GPIOB7 pins. This allows the clock synchrony from the arduino to the I/O port expander chip. The MCP23017 HAT from ModMyPi and BuyaPi. Adafruit developed a Python library which could be used together with MCP23017 chip. Download and install the Adafruit library, run the example "Hello World", and this lcd interface is operational. I’ve wanted to play around with some LCD screens and since this was a self contained kit for $20, I thought I’d try it out. com: 5 pcs - MCP23017 - i2c 16 input/output port expander: Computers I suggest looking at the Adafruit MCP23017 library for code examples. Adafruit MCP23017 Arduino Library Author Adafruit Website https://github. h Adafruit_RGBLCDShield. you can change these pins to whatever you like. setClock() compile OK but do nothing? Order today, ships today. # Simple demo of reading and writing the digital I/O of the MCP2300xx as if # they were native CircuitPython digital inputs/outputs. I recently picked up an Arduino LCD shield kit from Adafruit. The Arduino sketch is based on the wire library and the MCP23017 library from Adafruit. This is a library for the MCP23017 I2c Port Expander These chips use I2C to communicate, 2 pins required to interface Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit! The MCP23017 and MCP23008 integrated circuits are a great way to add more I/O pins to a microcontroller. Being that we're not working with interrupts, we leave INTA and INTB unconnected. Contribute to Adafruit-MCP23017-Arduino-Library development by creating an account on GitHub. MCP23017 - i2c 16 input/output port expander. The C pre-processor code (excerpt below) from Adafruit_MCP23017. Also units built using MCP23017 i2c port expander and a HD44780 LCD or conpatable 16x2 LCD. Re: Adafruit_MCP23017 Library for Arduino by franklin97355 on Wed Dec 24, 2014 4:43 pm The 4. 99. The Adafruit MCP23017 library assigns each GPIO pin a number as you can see in the following diagram: On both expanders the RGB LEDs are on ports 8,9 and 10 (to save me writing separate code for each RGB LED), the blink LED on port 7 of the first expander, and the buttons occupy ports 4, 5, 6, and 7 of the second. com/adafruit/Adafruit-MCP23017-Arduino-Library  Hello, The MCP23017 is a 16-Bit I/O Expander with Serial Interface (s2C) and the For the MCP23017 I have used the Adafruit library. One MCP23017 provides an additional 16 GPIOs that you can use. A list of the 181 libraries in the category Signal Input/Output. The 16-bit I/O port functionally consists of two 8-bit ports (PORTA and … Python library: Adafruit offers on their website a python library with which your python program could speak to the MCP23017 chip. The easiest way to use it is with our convenient WebIDE, which will automatically point to the Adafruit github repository. /***** This is a library for the MCP23017 i2c port expander These displays use I2C to communicate, 2 pins are required to interface Adafruit invests time and resources Save mcp23017 port expander to get e-mail alerts and updates on your eBay Feed. Please see the pseudo code to see what I'm thinking. This is a library for the MCP23017 I2c Port Expander. This library makes it very easy to use the additional I/O  Amazon. If 8 onboard GPIO ports + 16 extra ports is not enough, you can connect up to eight MCP23017 chips to your Pi using different i2c addresses. Adafruit even have an Arduino library with example code written which will set pin state, read and write from individual pins, and set the pullups. com/products/2471) dev board from Adafruit and thought it would be pretty cool to use in my SID I want to use NodeMCU v3 with MCP23017 that has MAX6675 at the end. Arduino or PIC devices and they even include interrupts. 714 – MCP23017 Character LCD 16x2 RGB Display Arduino Platform Evaluation Expansion Board from Adafruit Industries LLC. It uses the I²C Bus for communication. We connect pin 13 of the MCP23017, which is the SDA (serial data line) to analog pin 4 of the arduino. g. Can someone help me or guide me as to how to port the Adafruit_MCP23017 library to Spark Core: GitHub adafruit/Adafruit-MCP23017-Arduino-Library. Adafruit's MCP23017 library is sufficient so I don't need help so much with that, it's just finding code where I type out values (while updating the LCD) then setting them as variables in my functions. Canada. FREE Shipping on orders over $25 shipped by Amazon. So we connect VDD to the 5V terminal of the arduino and of course we connect VSS to ground. The A0 , A1 and A2 pins of the MCP23017 are all connected to ground and reset pin to 5V. The MCP23017 uses two i2c pins (these can be shared with other i2c devices),  Mar 8, 2018 The MCP23008 and MCP23017 family of chips provide an easy way to add extra digital inputs and outputs to your development board. To display message to the LCD, I am using Adafruit LCD library. In this tutorial I used the MCP23017 which is a GPIO expander by MICROCHIP that talks with a PIC16F877 using I2C protocol. We used pin 27 on the MCP23017, so only specify RED for the monochrome backlight. I just discovered this very cool Huzzah (https://www. I have changed the pin according to the connections I have made but it seems to be displaying only blocks in the first row of the LCD. There is one of these MCP23017 i2c (16 input/output) port expander chips in the kit. The PCB shown below includes 2x MCP23017 and 2x 74HC4051. Hey all, I've had a lot of success using the standard GPIO pins on my Raspberry Pi B+, but I was ready to get even more pins, so I decided to buy the Adafruit MCP23017 port expander chip. Specify the new address with a keyword parameter: #mcp = adafruit_mcp230xx. Nick I decided to write my own MCP23017 library to get a better understanding of how they work and in case there are problems in the adafruit library with the interrupt related functions. h Based on my (little) experience with the Spark Core so far, I’m sure there’s plenty to adjust - but I don’t know much about C. Cool! Isn’t it? The enhanced value of a micro PC as Raspberry Pi with respect to a classic - Tue Mar 14, 2017 8:09 pm #63692 I want to connect 1 single WS2812 LED to each of the 8 pins of Port A of MCP23017. My bible ended up being the MCP23017 Manual and an article on Raspberry Pi Spy. 16-bit I/O Port Expander MCP23017 (I2C) The MCP23017 is a 16-bit, general purpose parallel I/O port expander for I2C bus applications. The 74HC4051 is a 8-channel analog multiplexer/ demultiplexer. The MCP23017 component allows you to use MCP23017 I/O expanders (datasheet, Adafruit) in ESPHome. The pHAT features a single removable MCP23017 DIP IC, which utilise two i2c pins (which can be shared with other devices if required), and in exchange gives your Raspberry Pi Zero an additional 16 GPIO ports! Widgets. MCP23017-E/SP – I/O Expander 16 I²C 1. Add another 16 pins to your microcontroller using a MCP23017 port expander. I am working with the source code out of Stefan's toolbox. You can embed Open Hub widgets in your web site. 99 $ 7. Pricing and Availability on  3 nov 2016 The MCP23017 uses two i2c pins (these can be shared with other i2c transistorer MCP23017 - i2c 16 input/output port expander. 7. mcp23017 import MCP23017 # Initialize the I2C bus: i2c = busio. They use the i2c standard, so they can share the same serial line with 254 other sensors and even up to 8 other chips of the same exact type. Loading Each input/output has a 0-5VDC tolerance, limiting I/O operations to TTL/CMOS voltage levels. h EEPROM. Adafruit MCP23017 compiles OK but all lines stay dead on the scope knight rider at least puts out pulses but no change in PCF8574 IO pins There was a "Sketch Buffet" that I hoped to copy but it would not compile with the current SDE That include i2c. Adafruit LCD MCP23017 IC - posted in Netduino Plus 2 (and Netduino Plus 1): Hi, I am looking for a diagram how to connect the Ada lcd to the Netduino. Mouser offers inventory, pricing, & datasheets for MCP23017. SDA is the serial data line. com], Domaine Publique TRADUCTION FRANCAISE par Meurisse D. Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit! Hi! i i2c’d up and mcp23017 to a esp8266 nodemcu devkit v0. Based on the popular MCP23017 programmable GPIO chip from Microchip, this device is very easy to use, providing an easily programmable GPIO expansion office for just about any microcontroller. The MCP23017 and MCP23008 integrated circuits are a great way to add more I/O pins to a microcontroller. Using the library Never one to leave you with just a breakout board or an IC and a goodbye, Adafruit provides a library for the MCP23008 and MCP23017 in our Pi repository on github (https://adafru. There are three address pins on the MCP23017: A0, A1 and A2. I have made my own library for this chip and implemented some of the MCP23017 functions that were not implemented in the adafruit MCP23017 library. Ask Question I was using the Adafruit 16 servo board but I think I fritz-ed it. Each MCP23017 provides 16-bit, general purpose parallel I/O expansion for I2C bus or SPI applications. It would probably also help mentioning I'm still new to a lot of things. This is a library for the MCP23017 I2c Port Expander These chips use I2C to communicate, 2 pins required to interface Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit! the MCP23017. Adafruit MCP23017 Library 1. com/adafruit/Adafruit-MCP23017-Arduino-Library Adafruit MCP23017 pin mapping Adding even more GPIOs. It is intended to be used on a Raspberry Pi in conjunction with the built in GPIO pins. Oh well thats life. writeGPIOAB(val);. 9. Code écrit par LadyAda pour AdaFruit Industries [www. Get it as soon as Tue, Jul 30. It connects to analog pin 4 on the arduino. Adding an MCP23017 I/O Extender to Arduino or ESP8266: UPDATE Okt 2017: Although this works flawlessly, I would now advise against making it for the simple reason that a cheap, ready made module is available on aliexpress, the price of which rivals the price of the DIL chip alone. MCP23017 I/O Expander¶. Adafruit mcp23017. If you are looking for more information on the MCP23017 then goto this page where there is more general information on all aspects of the device including other example code and register descriptions. Arduino has library for I²C bus and protocol named Wire. – Doug Apr 4 '17 at 9:25. My question is how can i fireout the mcp23017 gpio with Blynk virtual port. The point i am right now is the communication ok. Introduction. adafruit mcp23017

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