New Arduino Q&A site online

If you’re interested in using Arduinos then I recommend checking-out the new Arduino Q&A site over on Stack Exchange. (It’s totally free to use.)

As with most Stack Exchange sites, it was in private beta for a couple of weeks to get it started. It’s now gone into public beta, which means it’s fully functional and anybody can join in. It’s a great place to go if you need help with specific Arduino problems, or if you’ve got some awesome expertise that you want to share.

What is a serial-to-parallel shift register?

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. 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.

In this post, I’ll be looking at the 74HC595, which is an 8-bit SIPO IC (i.e. it gives you 8 outputs). 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. 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.
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