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Arduino - Arduino Uno (R3) - ShareTechnote
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49 MORE PINS PLEASE! PCF8574 Arduino Pin Extender (Easy) - YouTube
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Arduino 74HC595 Interfacing: Increase Output Pins - The Engineering Projects
Extending PWM output pins with a Texas Instruments TLC5940 LED driver using arduino -
Arduino - ShiftOut, Extend Output Pins on Arduino With Shift Register 74HC595 « Funny Electronics
