In the last chapter, we looked at how packages of commonly used code called libraries can be useful for working with a range of different kinds of hardware. Usually, these libraries are written for very specific devices or hardware that uses particular components. In this chapter, we will look at a few more libraries for working with more standardized communication protocols that can be used to communicate between many different types of devices that speak the same language. In Chapter 6 we got a taste for using hardware serial communications for monitoring an analog input, although this was a fairly basic one-way communication.
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