Arduino Shift Register Input. The standard sipo chip is a 74hc595 shift register and the piso chip is a 74hc165 shift register. They are cheap.
For the normal working of the shift register first connect the pin 16 vcc and pin 10 reset to 5v pin of the arduino. Then connect pin 8 gnd and pin 13 oe to the gnd pin of the arduino. A sipo is useful for driving a large number of outputs like leds or 7 segment displays and a piso is useful for gathering a large number of inputs like buttons.
This means you can read the state of up to 8 digital inputs attached to the register all at once.
An example of a parallel to serial register is the cd4021b sometimes referred to as an 8 stage static shift register. Shift registers come in two main types a sipo serial in parallel out or piso parallel in serial out. Since you already have input use an 74hc165 8 bit parallel in serial out shift register. In this tutorial we will use a digispark with a cd4021 shift register and read 4 tact switches.
