Robust C Library and Utility for GPIO sysfs Interface in Linux

This is a comprehensive and easy to read example C code designed to work alone or included as a library for dealing with general purpose I/O via the sysfs interface in Linux.  It can easily be applied to any computer which utilizes the GPIO sysfs interface (both pro and maker boards).  Getting started is a breeze.  You just need to decide if you’re going to use it as a library, including it into your existing code, or as a stand-alone utility.  We’ll talk about both in this article, but first and foremost, here’s the source code we’ll be working with:

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The Weather Outside Is Frightful (Or Is It?)

Blistery cold weather is starting to sink in, which ought to ignite an instinctual desire to get your house in order and monitor it so the water pipes don’t freeze and burst. So, we’ll take a timely look at a project setting up some temperature probes in various areas, reading them, and reporting in a custom dashboard. A true home automation expert would take things further by setting up relays to turn on heat tape or even maybe some actuators to control water flow. Maybe next year, but for now, we just want to be able to monitor important areas of our home (in this case a cabin in Montana) and understand temperature patterns over time for better planning. As with most projects, there is more than one solution, especially if it depends on what you have on hand. At the time, the list of things in hand were as follows:

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