XCSOURCE UNO R3 ATmega328P ATmega16U2 2015 Version Board + Free USB Cable For Arduino DIY TE111 Open circuit diagram of the original design, the development of software interface for free download, can also be in accordance with the requirements and their modified, download the program is simple and convenient. Can simply use sensors, all kinds of electronic components connection (such as: LED lights, buzzer, buttons, photoresistance, etc), make all sorts of interesting work, Microprocessor controller (ATMEGA328), using high-speed development interface and the environment are very simple and easy to understand, very suitable for beginners to learn.