1 74HC595 & 74HC165 Shift Registers with Arduino
DroneBot Workshop's walkthrough of input and output shift registers is the standard suggestion for anyone short of Arduino pins, covering both the theory and practical wiring.
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DroneBot Workshop's walkthrough of input and output shift registers is the standard suggestion for anyone short of Arduino pins, covering both the theory and practical wiring.
Considered a clear explanation of adding more digital inputs to an Arduino with a 74HC165 shift register, complete with test code.