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Download the high resolution schematic here > Official Arduino UNO R3 Schematics
As I am working on robotics and I required an open-source computer hardware and software company, project and user community that designs and manufactures microcontroller-based kits for building digital devices and interactive objects that can sense and control the physical world. Arduino Uno is one of the product that helps me to do so. I have searched in various sites to purchased it. On the basis of best reviews on the sites I favored to purchased it from rc89 which provide the components of robotics. I have purchased it few weeks earlier and there is no any problem has seen in its performance.