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MCP23017: Have you run out of I/O? This chip is the answer!
Arduino入門編㉚】マイコンのデジタル端子(I/O)不足を解消！『I/Oエキスパンダー(MCP23017)』の基本的な使い方！ | ぶらり＠web走り書き
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MCP23017: Have you run out of I/O? This chip is the answer!
![Abandoned] Read endstop with a mcp23017 - Software - Lulzbot](https://aws1.discourse-cdn.com/business7/uploads/lulzbot/optimized/2X/2/24aadb59bdd6269ff73b4b9c9dccc0a25c7763e5_2_690x378.png "Abandoned] Read endstop with a mcp23017 - Software - Lulzbot")