How to connect the MCP23017 GPIO Expander to an Arduino and Raspberry Pi
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- čas přidán 5. 07. 2024
- In this episode, we take a look at the MCP23017 GPIO Expander IC. With this IC, we can add 16 GPIO pins to the existing GPIO pins on an Arduino, Raspberry Pi, or any micro controller that has an i2c bus. They can be "stacked" for up to 128 additional GPIO pins! Bring on the LED's!
In this video we cover:
► Physical connection of the MCP23017 to a Raspberry Pi
► Code examples for the Raspberry PI in Python
► Physical connection of the MCP23017 to an Arduino UNO
► Code examples for the Arduino
As promised, all the code used in this video is on Github!
github.com/makersdigest/T05-M...
Parts that were used in this video:
● MCP23017 IC: amzn.to/2SZzJCp
● Arduino: amzn.to/2QgREHv
● Rapsberry Pi Kit: amzn.to/2Piy7kn
● Jumper Wires: amzn.to/2PkWxcX
● Breadboard: amzn.to/2QikbMQ
Now go get creative! Share what you have made with me. I can be found at
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● Instagram: / makersdigest
● Twitter: / makersdigest
● Patreon: / makersdige
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See ya next time!
#arduino #raspberrypi #makers - Jak na to + styl
![[ICStation.com] BitBastelei #278 - MCP23S17/MCP23017 IO-Multiplexer](/img/n.gif)
Working on a 16 step switch project. Each key has an embedded led. For 16 switches I actually need 32 gpio. Your video helped me to figure out how to work with this chip properly with a Pi Pico. Very helpful video! Thank you.
Happy to stumble across your channel. Clear and concise, thank you!
Thanks!
This is soo helpful, I couldn't find any proper explanation anywhere else
Helped me for my project
Tip: Check the Red & Blue lines on the power rails for any breaks that indicate power termination. Nice video, subbed :D
thank you very helpful video. one question, if modify the speed of i2c on raspberry, what the maximum number of chips we can use?
Awesome, thanks for explaining! :D
Are the indicator LEDs at the left just wired between VCC and ground? Do I not need a resistor?
I am somewhat new to using the Raspberry Pi (3 B+) and I would like to expand my GPIO as shown in this video. I already have a 20x4 LCD display using pin 3 (SDA.1) and pin 5 (SCL.1). Can pin 27 (SDA.0) and pin 28 (SCL.0) be used instead to setup the expansion board while the LCD display is still connected to pin3 and pin 5?
Damn this was good. Subscription added!
Thanks Kris!
That's some great quality video.
Thanks!
thanks dude!!!, you saved my life, get my like
I really need to know how I can chain these together in a RPI3B+. Also How many can be chained together? Are the bandwidth considerations? I am trying to figure out a way to hook up about 20 stepper motors and a camera with a few sensors also. BTW awesome channel. Thank in advance for your reply.
Very helpful. I’m attempting to revive the old diamond rio MP3 player parallel interface so I can get some new music on my 23 year old MP3 player :)
Nice explaining!! How can I use this in Domoticz?
Have you measured how many microseconds it takes for digitalRead() and digitalWrite() using these 16 GPIO pins via I2C compard to the pins which come on the microcontroller? Just wondering how much slower it is. Hopefully it doesn't take more than say 100 microseconds.
Exactly what I was looking for. Thanks!
hi is it possible to have the Arduino and Raspberry Pi connected to the same ic2 line at the same time?
Do you know similar chips that work in USB 2.0 instead of i2c?
Wat if the power cuts... Can we save the status of th pins of MCP23017 in the eeprom of arduino so that it regains its last state before the power cut
Hello, At first thanks for informations, just i want to ask why we use R 1K to reset pin?
I'm very very new to this but can someone broadly explain the difference between this and a shift register?
Hello. Thanx. Take the like. It works for me.
I wouldn't recommend hooking up with power applied. Connect, check, then apply power.
I have a problem, can anybody help me ? I have a mcp2307 and raspberry pi4 which is commmunicate with i2c protocol. When I set logic high one mcp pin all pin goes high. Have you any idea on this issue?
What about esp32 running micropython? Thanks.
Can you do a video on how to use this to control 1 or 2 i2c modules (say an I2C LCD to start with) using the arduino. For instance, how would you read from an I2C module and write to an I2C LCD through the MCP23017 (or MCP23S17 for SPI). Thanks.
I will put this on the list, good topic.
are the 5v and gnd pin really must be all connected? or just for 9 and 10 pin.
It really depends on the grounds, pin 15,16,17 are the hardware address pins. I set them all to low to get a specific I2C address. But you can look at the datasheet on how to set specific addresses in case you are chaining more than one of these together. But personally, I like to set them all to low for single IC applications because it is stable.
For the 5v on reset, I am going to say yes on that one for this application because that's the way I have always done it, and it works. I am sure there are other things you can do with that pin as it is a "reset", but would have to dig into the datasheet deeper than I have to figure it out. Otherwise, give it a try and see if it works!
I am using the Adafruit librabry and got my Python running. Is there a way to initiate the mcp() so that when I read the pins it says 1/0 not True/False?
you can always define a small function to convert T/F to 1/0, tho calling it everytime can get annnoying....
maybe make the function name really small like b2b (boolean to binary)?
Can someone briefly explain why a resistor is needed for the reset pin? Why can't it take the 3.3 straight?
I have it on the 3.3V and it works
He never said what resistor to use with the LED. Anyone have an answer to this? Thank You.
Hi. Sorry the stupid question... i can connect 4 mcp23017 to a Arduino Nano?? is for manage 64 reed switch (for a chess board). Thanks for your time.
MilS Lion I believe you can have 8 of those IC’s on one I2C bus. You will need to configure the address pins on each one to have a separate address in order for that to work. Check the data sheet on how to do that. In a nutshell, all the SDA pins connect together, as well as SCL pins. Then address correctly.
Hope that helps!
@@makersdigest4752 Thanks!Yes that help.
is this possible to use as analog input?
ぱんぷきん hi there, no. Check the mcp3008 video here for analog inputs. This IC is only digital input
What luck. I just got 5x MCP21017's in the mail today and was looking for a guide on how to hook them up!
Tiny Starship awesome! Let me know if you have any questions, or if I can help.
@@makersdigest4752 hello, if we have 2 mcp 21017 then for the code will it be 0 to 32 and not 0 to 16?
@@falseee4445 Do you have the answer to that question? I`am realy curious..
@@MGort-bb8op The 2nd mcp should be set up with a different i2c address, you will get another 0 to 15 ports available. See arduino.stackexchange.com/questions/30862/how-to-use-different-device-address-for-mcp23017-so-i-can-use-multiple-chips
a like for the intro
I think I have fake ebay MCP's , that's the second tutorial I follow that does not work, Already bought MCP from Mouser :(
very nice. pitty you stoped making videos
Eugenio Streliaev Filho thank you! I’ve stopped temporarily on this channel because I have been busy making videos over on Element14 Presents. I have plenty more scheduled for this channel and will hopefully get back to it sometime soon!
Check out Element14 Presents for some different types of builds. Lots of other great folks making there also!
No longer works. Adafruit made changes to the library.
Sorry for comment, but do not teach new people to wire things up with power applied.