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

That average color is fed down to the Arduino over its stock serial connection, where it is output to 3 of the pwm capable outputs. Those outputs are connected to the 2003 Darlington transistor ...

32-bit Cortex-M4 Arduino has revised its UNO board and promised "a long-awaited update on performance and possibilities." The Arduino UNO R4 keeps the UNO family’s standard form factor ...

The little computer measures 3.6″ x 2.1″. For developers, there are also GPIO, UART, and other pins and the same Arduino sockets you’d find with an Arduino UNO.

Features common to Arduino R4 – ‘WiFi’ (€25, below) and ‘Minima’ (€18, right) IO connections are in physically similar positions to Uno R3, and IO remains 5V. USB connector changed to Type-C. 6 – ...

Arduino has announced the new UNO R4 board family for prototyping and learning. The new models feature a faster microcontroller, a USB-C connector, improved power, Wi-Fi and Bluetooth LE, and more.

He said Arduino 101 is comparable to the Arduino Uno, which is based on a microcontroller from Atmel, except the Curie board includes Bluetooth and the six-axis sensor.