About Us Knowledge Base Community Forum Electronics Toolbox FAQ Shipping & Delivery

Community Forum

Share your projects and post your questions

Register or Sign In

Expander Pi on a custom board

524 Views - Created 06/11/2020


Posted by:

Users Avatar


I have a project which uses the exander pi 16 channels but need extra channels. Was thinking about making a custom board using all the components from the expander pi + a 32 channel IO Pi Plus expander. Which is the same as the expander pi chip (MCP23017) just two of them. Would the new custom board still work with the exapnderpi library?



Posted by:

Users Avatar

United Kingdom

Users Twitter  Users Website  


Your custom board should work with the expander pi library. 

For the MCP23017 you may want to use the IO Pi library as this will allow you to set the I2C address for each IO chip.  In the expander pi library the MCP23017 is preset to i2c address 0x20.

AB Electronics UK Tech Support

Note: documents in Portable Document Format (PDF) require Adobe Acrobat Reader 5.0 or higher to view, download Adobe Acrobat Reader or other PDF reading software for your computer or mobile device.