In this project, we will show how to read input from input devices connected to an mcp230xx io port expander connected to an arduino microcontroller. Iic input output expansion board mcp23017ess i2c interface. I will cover how to work with the mcp23017s interrupt ports in a later post. The mcp23016 io expander is an i2c slave device with a base address of 0x20. Pricing and availability on millions of electronic components from digikey electronics. Configuration depends on how you want to use a certain port on this device. Buy mcp23017 e sp with extended same day shipping times. How to read input from an mcp230xx io port expander. Re mcp23017 and interrupts and adafruit mcp23017 library. An io port expander is a chip that allows additional io ports to a microcontroller. The mcp23017 is a handy 28 pin chip that gives you 16 pins that can be used as either inputs or outputs max 25ma from each pin and up to 8 of the mcp23017 can be used on one i2c bus. Mcp23017esp microchip technology integrated circuits ics.
May 19, 2012 the mcp23017 is a handy 28 pin chip that gives you 16 pins that can be used as either inputs or outputs max 25ma from each pin and up to 8 of the mcp23017 can be used on one i2c bus so it can give you a whole lot more io than the pi has built in as well as reducing the risk of frying the pi and also has the added advantage that the expander can be located away from the pi linked with only. The number of pins is known by the expansion module and its 16 for the mcp12017 and 8 for the. Have you switched back to using the old fritzing models. This allows data transfer between the arduino and the io port expander chip. The address assumes you are using an mcp23017 with all three address pins set to gnd. Nov 09, 2016 i want to use more than 3 mcp23017 e sp dip28 chips so i can use many digital pins. 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. This guide shows how to communicate with the mcp23017mcp23s17 16 bit io expander using either spi mcp23s17 device or i2c mcp23017 an. The mcp23017 needs to be connected through the i2c interface. I suggest looking at the adafruit mcp23017 library for code examples.
Download the free library loader to convert this file for your ecad tool. I2c is a great interface to work with along with the mcp23017. It gives you an extra 16 io pins using an i2c interface as well as comprehensive interrupt control. Mcp23017 seriele interface i2c spi hobbyelectronica. I am creating a basic cable tester device and using i2c to interface with two mcp23017 io expander chips. 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. How to use a mcp23017 i2c port expander with the raspberry pi. Can be configured as active high, active low, or open drain.
The mcp23x17 consists of multiple 8bit configuration registers for input, output and polarity selection. If you are using a different address pin configuration, you can open up the datasheet to see how the address scheme works mcp23017 datasheet or. Mcp23017 datasheet, mcp23017 pdf, mcp23017 data sheet, mcp23017 manual, mcp23017 pdf, mcp23017, datenblatt, electronics mcp23017, alldatasheet, free, datasheet. Raspberry pi and the mcp23017 i2c io expander nathan. Can be enabled for interrupt on change, andor internal pullup resistor. When enabled, the mcp23017s interrupt ports will notify you when ever one of its digital io ports experiences a state change. Serial data io mcp23017, serial data input mcp23s17.
Compare pricing for microchip mcp23017 esp across 27 distributors and discover. Mcp23008mcp23s08 ds21919bpage 4 2005 microchip technology inc. View datasheets, stock and pricing, or find other gpio expanders. To drive it you use the two i2c pins on the pis gpio header pins 3 and 5. Mcp23017 i2c interface mcp23s17 spi interface the mcp23x17 consists of multiple 8bit configuration. In how to use a mcp23017 i2c port expander with the raspberry pi part 2 i explained how to use an mcp23017 16bit port expander to provide additional outputs. I want to use more than 3 mcp23017esp dip28 chips so i can use many digital pins. If you want to use inputs as well, youll need a level converter or, as andrew said below, a resistor. It connects to the mcp2307 with two gpio pins of your own choice. Mcp23017eml microchip datasheet and cad model download. Heres the code to drive the mcp23017 with wiringpi2 for python.
Youre kind of lucky now, since the minimum level for a 1 on the address pins a0 and a1 is 0. The methods to create pdf files explained here are free and easy to use. Being that were not working with interrupts, we leave inta and intb unconnected. The mcp23017 mcp23s17 mcp23x17 device family provides 16bit, general purpose parallel io expansion for i2c bus or spi applications. The mcp23017 and you a beginner tutorial dogbird sensors. This module is the 16 way io extension module of the 12c interface, and built in the mcp23017 chip of microchip.
Its actually possible to drive multiple port expanders giving you a huge boost in the number of inputs or outputs. It works as promised solid build breadboard friendly cons. Mcp23017 mcp23017 mcp23s17 16bit io expander components datasheet pdf data sheet free from datasheet data sheet search for integrated circuits ic, semiconductors and. This allows the clock synchrony from the arduino to the io port expander chip. If a stop or restart condition is generated during a data transfer, the data will not be written to the mcp23017. The mcp23017 is a 16bit, general purpose parallel io port expander for i2c bus applications. In this article ill show a basic input example where we read the status of a push switch. The raspberry pi has one i2c bus and the mcp23008mcp23017s have a 3bit address select port, so intheory you can connect up 8 mcp23008mcp23017s giving you a gpio capability of an additional 128 io pins. Add another 16 pins to your microcontroller using a mcp23017 port expander. A pdf creator and a pdf converter makes the conversion possible.
In my code each mcp23017 slave has its own address and i can communicate with both of. Mcp23017esp microchip datasheet and cad model download. In my code each mcp23017 slave has its own address and i can communicate with both of them properly via i2c. Microchip, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Each io can be arbitrarily configured as input or output, and a pull up resistor can be set, and the interrupt function can be enabled for the io configured as input. This guide shows how to communicate with the mcp23017 mcp23s17 16 bit io expander using either spi mcp23s17 device or i2c mcp23017 an 8 bit version and open drain versions are also available that should work with the same code. The mcp23017mcp23s17 mcp23x17 device family provides 16bit, general purpose parallel io expansion for i2c bus or spi applications. The number of pins is known by the expansion module and its 16 for the mcp12017 and 8 for the mcp23008.
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. Arduino or pic devices and they even include interrupts. The mcp23017 is a port expander that gives you virtually identical ports compared to standard microcontrollers e. You can set each of 16 pins to be input, output, or input with a pullup. Oct 01, 20 when enabled, the mcp23017s interrupt ports will notify you when ever one of its digital io ports experiences a state change. Adding an mcp23017 gives us 16 additional gpio ports to play with. The 16bit io port functionally consists of two 8bit ports porta and portb. Theres some parts of wiringpi2 that i havent yet explored. The mcp23017 is a port expander that gives you virtually identical ports compared to standard. The device i chose was a mcp23017 i2c port expander with a total of 16 ports. Not as cheap compare to shift registers but the mcps are easier.
How to use different device address for mcp23017 so. If a pin is pulled low, the bit for that pin will be zero. Mcp23017 mcp23017 mcp23s17 16bit io expander components datasheet pdf data sheet free from datasheet data sheet search for integrated circuits ic, semiconductors and other electronic components such as resistors, capacitors, transistors and diodes. This chip is compatible with 3v3 and it can be connected to the esp without levelshifters connections mcp23017 esp01 gnd gnd vcc vcc sda gpio 0 scl gpio 2 esp easy. The mcp23x17 consists of multiple 8bit configuration registers for input, output and. Expanding the raspberry pis gpio capabilities with the mcp23017. For a multiple 23017 interrupt tutorial for this chip see here. Jul 31, 20 in how to use a mcp23017 i2c port expander with the raspberry pi part 2 i explained how to use an mcp23017 16bit port expander to provide additional outputs.
Sk pang electronics mcp23017 16bit i2c io expander mcp23017 this is a mcp23017esp 16bit io expander with i2c interface. The idea of the code below is to have the mcp23017 trigger int0dp2 and int1dp3 on a nano separately, with 2 separate isrs turning on. I am able to use this mcp to expand my io pins with ease. The idea is that both ends of a cable will be placed in the two sockets. We connect pin of the mcp23017, which is the sda serial data line to analog pin 4 of the arduino. Data is written to the mcp23017 after every byte transfer.
Using the mcp23017 port expander with wiringpi2 to give you 16 new gpio ports. Mcp23017 seriele interface i2c spi op een handige breakout. How to read input from an mcp230xx io port expander connected to an arduino. The operation is ended with a stop p or restart sr condition being generated by the master. I will cover how to work with the mcp23017s interrupt ports in a. Mcp23017mcp23s17 ds20001952cpage 4 20052016 microchip technology inc. How to use a mcp23017 i2c port expander with the raspberry. If you are using a different address pin configuration, you can open up the datasheet to see how the address scheme. Buy mcp23017esp with extended same day shipping times. Using the mcp23017 port expander with wiringpi2 to give you 16.
I2c bus data requirements i2c interface ac characteristics. Using the mcp23017 port expander with wiringpi2 to. Compare pricing for microchip mcp23017 esp across 27 distributors and discover alternative parts, cad models, technical specifications, datasheets, and more on octopart. Raspberry pi with i2c port expander mcp23017 16 relay. The mcp23017 uses two i2c pins these can be shared with other i2c devices, and in exchange gives you 16 general purpose pins.
This is a very versatile and multiconfigurable io expander. Mcp23017 mcp23s17 ds20001952cpage 4 20052016 microchip technology inc. Mcp23017esp microchip technology interface io expanders 16bit input output exp i2c interface datasheet. How to connect an mcp23017 io port expander to an arduino. Jul 31, 20 the device i chose was a mcp23017 i2c port expander with a total of 16 ports. I am using the mcp23017 on an adafruit lcd keypad kit, so some of the pins are being pulled low by the board. Below is the mcp23017 in a schematic view showing all of its pin outs. Microchip, alldatasheet, datasheet, datasheet search site for electronic components and. If all pins for a port are pulled high, the hex value for the port will be 0xff. In this project, we will show how to read input from input devices connected to an mcp230xx io port expander connected to. If you want to use the same mcp23017 port expander chip directly with i2c instead of wiringpi, matt hawkins has done a 3part series on how to do that here. Mcp23017 mcp23s17 ds20001952cpage 6 20052016 microchip technology inc. Mcp23017 is our port expander mcp23017 100 the gpios start at number 100 0x20 is the address of our mcp23017 20 mode the mode of the pin is determined in or out. It has additional threebit address pins a0, a1, a2 on pins 16, 17, and 18 respectively.