After this tedious step, he designed a PCB that hosts an Arduino Nano to accept input, two MCP23017 GPIO expanders to give it enough outputs, and CD4066BE CMOS switches to trigger the connections.

† Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States ‡ Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, Illinois 60660, United States ...

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