This site uses hands-on experiments to show the basics of how real things in the real world are controlled with computers. That means it's about most of the computers in the world. Most computers don't sit on desks, but are used to control things that don't look anything like a computer, such as factories, spacecraft, toys and appliances. This site provides the opportunity to learn basic control and embedded system concepts while taking advantage of the low cost and conveneince of using a PC as a platform.
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References: https://www.learn-c.com/