IO expander MCP23017 breakout
SKU: 333007
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24/7 lifetime customer and technical support
2-year Warranty - no questions asked
Comprehensive Documentation
Open-source everything
Product Description
Are you short on IO pins? Looking to increase the number of them? That’s what the GPIO Expander MCP23017 is for! It uses I2C communication to do so. With just two wires, 16 new fully configurable digital IO pins are added to a microcontroller.
Due to the jumpers on the board, the I2C address of a device can be changed. Thus, eight breakout boards can be connected to a microcontroller. All of the pins on the expander board have pull-out resistors that can be turned on and off.
Product features
Complimentary technical support
In case you ever get stuck with using this product, you can count on us. We provide free, no-strings-attached technical support with this product. Just reach out to us with your questions, and we'll be there to help you.
Open-source
Open-source culture is rooted deep inside us, and that’s reflected in our products. This product follows the open-source principle. It was made with the community’s suggestions and needs in mind. With a modular design, it can be modified to your needs and incorporated into your projects. We provide all the design documentation needed free of charge on our Github repository.
Made in EU
Soldered products, designed and manufactured in Croatia, are thoroughly tested and meet the highest EU standards of quality and safety.
easyC
easyC is a system for simple connection of microcontroller boards, sensors and actuators that enables fast prototyping without the possibility of error. The connection between the modules takes place with simple cables. easyC is based on I2C communication. Read more here.
Key features
- Standard current consumption: 1 mA
- Standby current consumption: 1 μA
- Logic voltage level: 5V
- Operating voltage: 1.8V to 5.5V
- Communication: I2C (address: 0x27)
- Connectors: easyC x2
- Mounting holes: 2
- Dimensions: 38 x 22 mm / 1.5 x 0.9 inch
Product usage tips
If the breakout board is not working, most commonly something is not connected correctly. Check the pinout and wiring. You’ll likely find the problem there. Check if the SDA and SCL lines are connected correctly from the board to the microcontroller. Make sure the I2C address of the expander is correct – it should be 0x27.
The board comes with two easyC connectors for easier connection with other I2C devices. Because of this, it works perfectly with any Dasduino board and I2C breakout boards. It has two mounting holes so it won’t move an inch once mounted somewhere.
Useful links & tutorials
Pinout drawing 
Arduino library 
Open Source Hardware files 
Product datasheet 
CE certificate Related blog posts
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