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 ...

The Arduino UNO R4 Minima and the Arduino UNO R4 WiFi. But apart from the obvious wireless connectivity hinted by the name what other differences do the microcontrollers have.

Arduino UNO R4 Minima (store / docs) - base version. Arduino UNO R4 WiFi ( store / docs ) - version with a Wi-Fi/Bluetooth module (ESP32) and a 12x8 LED matrix. This major change will introduce many ...

Arduino UNO R4 WiFi. Arduino UNO R4 specifications: Microcontroller – Renesas RA4M1 Arm Cortex-M4F MCU @ 48 MHz with 32KB SRAM, 256KB flash; Wireless (Arduino UNO R4 WiFi only) – ESP32-S3-MINI-1 ...

Two versions of the new 32-bit Arduino UNO board will be offered: UNO R4 WiFi and UNO R4 Minima with the only difference being the former getting an ESP32-S3 module for wireless connectivity. Arduino ...

This leap forward starts with a new processor by Renesas, a global leader in microcontrollers, analog, power and SoC products. While over 10 million users have enjoyed playing and working with Arduino ...