Main components

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Part NumberDescription
PCAL6416APWIO expander 16 GPIO, I2C 400kHz, Interrupt, 1.65 - 5.5V, TSSOP-24
ULN2003AHigh Voltage, High Current Darlington Transistor Arrays, SOIC16/SOIC16W/DIP16/TSSOP16

gk schematic

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gk board layout