At the beginning of this book, we noted that the Arduino is an open source hardware and software platform. All the original hardware design files are released under the Creative Commons Attribution Share-Alike license. This license allows both personal and commercial derivatives of all the Arduino boards if they credit Arduino and release their design under the same license. This has led to many lower price generic boards.
If you search for an Arduino board on most online retailer sites, the majority of the boards will not actually be genuine Arduino boards. If you look at the Arduino Uno board in the following photograph, you will notice an infinity sign with a plus (+) and minus (-) in it. That is the official Arduino logo ...
