The Arduino Uno-compatible board has an MCS-51 (often called 8051 instead) instead of the usual ATmega328P/ATmega168. Specifically, [ElectroBoy] uses the AT89S52 .

Both the Arduino Nano and Uno can be powered via their integrated USB connectors. This automatically supplies regulated 5V power to the board, allowing you to use any USB-supported power source ...

Fred Dart at FTDI has created a new energy efficient Arduino UNO compatible board that is based on the FTDI FT231X USB UART and is capable of delivering 5V at a full 1A without overheating.

Pinoccio is a new Internet of Things-friendly microcontroller designed to get home-brew electronics projects talking to the internet and, usefully, each other. Pinoccios come with or without Wi-Fi ...

An Arduino Uno-compatible home automation board requires no separate power supply as a power source soldered onto the board itself. According to the developer GarageLab, it is supplied directly from ...