Probably you have noticed that Arduino is spread worldwide. It would be ridiculous to see one manufacturer producing them. The Arduino group produces original board that are named Arduino. This is their trademark. But being open source product, Arduino become popular popular in almost all workshops and so demand is huge. Since building plans are open other electronics manufacturers started building Arduino compatible boards. These are same Arduino boards, but with Arduino name and logo removed. Other than that is 100% compatible to standard Arduino that works with software tools, extensions and modules. Arduino compatible Uno R3 Rev3 development board is one of most known boards. Because this form factor is the first Arduino step in to community. It became reference shape for majority shields and and other products. Even today powerful boards that have an Arduino functionality in them still carry this pin arrangement to accept shields. UNO evolved…
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