Arduino
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Acknowledgments
Some parts from Arduino introduction slides by Linz Craig, Nick Poole, Prashanta Aryal, Theo Simpson, Tai Johnson, and Eli Santistevan, licensed under Creative Commons Attribution-Share Alike 3.0 License.
Most Arduino-based circuit images are created using Tinkercad (create an online account to simulate all the examples before trying on real hardware!).
Some images created using Fritzing.
Some images are from Wikipedia.
Some images are copyrighted by their respective owners.