In general, a shift register is a memory buffer which you write to and/or read from sequentially, depending on the application. That means you can control it with pretty much any digital output channels, and it’s very easy to write simple software to communicate with it. The advantage of this chip over some dedicated port expanders is that it doesn’t require a complex protocol like I2C or SPI, and it doesn’t need a particular clock speed. In this post, I’ll be looking at the 74HC595, which is an 8-bit SIPO IC (i.e. For example, if you don’t have enough GPIO pins on your Raspberry Pi, Arduino, or other computer/microcontroller, you can use a shift register to add more. A serial-to-parallel shift register (or SIPO: Serial In Parallel Out) lets you take a sequence of signals on one output, and split them up into several separate outputs.
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