This circuit takes serial inputs one bit at a time and outputs them parallel or simultaneously on all output pins. An IC like the 74HC595 Shift Register is a 16-pin SIPO.
![Arduino UART: Insights, Logs & Arduino Code [Lib & Register Level]](https://i.pinimg.com/originals/84/1f/a9/841fa95a98c72866a62b9694bf008cde.webp)
