In fact, the original Uno has already been retired. That said, we'll be focusing on the Uno R3 ... power supply here, but the recommended voltage and current ratings are 7 to 12V and 1A only. The ...

Microcontroller demo boards such as the Arduino UNO are ubiquitous on Hackaday ... and moved on to the power supply to make it self-sustaining, then onto the communication circuit, and finally ...