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A 7-minute video explaining an overview of the device usage & how it was built.
Circuit diagram
The decoupling capacitors for MCP23S17's are not shown due to lack of space. I used 0.1uF ceramic caps to connect VDD and VSS. Also, the diagram does not include wiring to the push buttons, but in short: Two MCP's handle all the rows, and the third MCP handles the five inputs required for the columns. You can see the exact ports from the embedded code.
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