ChessLR MCP23027 Port Expanders

Date: Jul 4, 2019

ChessLR progress report 4. I got two MCP23017 port expanders working on my Raspberry Pi. The chip refused to work until I eventually figured out that the negative rail on my breadboard wasn't connected. While searching for a reason it didn't work lead me to a site with examples of how to use the command line to test the I2C bus for connected devices, as well as be able to send data to it.

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Copyright © 2019, Lee Patterson