Arduino UNO Compatible USB Board R3

This is the new Arduino Uno R3 compatible. The following enhancements have been made:

• Selectable voltage of 3.3V/5V: Arduino Uno R3 can only work for 5V. This Arduino Uno compatible USB board can select to be 3.3V or 5V.
• When use wall adapter, it can supply up to 5V 2A compared to the original 500mA of Arduino Uno.
• It supports 7-23V wall adapter input.
• Both female and male headers.
• Original Arduino Uno has ADC router issue, this board improves the layout and better ADC noise immunity.