The Elegoo UNO R3 is a fully Arduino-compatible development board packed with an ATmega328P chip and a USB cable included.
What Is the Elegoo UNO R3?
The Elegoo UNO R3 is a microcontroller development board designed for makers, students, and electronics enthusiasts. It is built around the ATmega328P microcontroller — the same chip used on the official Arduino UNO R3 — and is fully compatible with the Arduino IDE, making it a seamless drop-in alternative for projects of all kinds.
Upgraded Hardware for Better Performance
One of the board's key improvements is the adoption of the ATMega16U2 as the USB-to-serial interface chip, replacing the older ATMega8U2. This upgrade delivers faster data transfer rates and expanded memory capacity. The female header connectors also feature clearly printed I/O labels, making wiring more straightforward for beginners and experienced users alike.
Flexible Pin Layout and Shield Compatibility
The UNO R3 places SDA and SCL pins adjacent to the AREF pin, and adds two extra pins near the RESET pin — including an IOREF pin that lets shields adapt to the board's operating voltage. This design ensures compatibility with all existing Arduino shields while also supporting newer shields that take advantage of these additional pins.
Power Options and Protection
The board accepts power either via USB (5V) or through a DC barrel jack (7–12V), giving users flexibility depending on their project setup. A built-in PTC resettable fuse helps protect the board from damage caused by accidental short circuits or incorrect wiring.
Who Is It For?
Whether you're just starting out with electronics or prototyping a more advanced project, the Elegoo UNO R3 with USB Cable offers a reliable, RoHS-compliant platform. Its broad shield compatibility and Arduino IDE support make it a versatile foundation for countless DIY and educational builds.
