Is this the same thing as an arduino?

Arduino is just a specification for a microcontroller. Although there is an official "Arduino Brand" this model does 100% of what that model does for $5 less. I have a kit that connects every GPIO pin of Arduino, and it connected fine. So for all intents and purposes, this is "the same thing as an arduino."

Ordered two of these and get the same error message: avrdude: ser_open() : can't open device "\\.\COM4": the system cannot find the file specified.

When this happens, I've fixed it by closing the Arduino IDE, unplugging my USB cable from the UNO, plugging it back in, and restarting the IDE. (Save the file before closing the IDE, if desired.) This has always corrected the issue for me, even when the IDE shows an Arduino on COM4 and it's selected yet still seems unavailable.

Does this use the CH340 ?

No. And no. He wants to know the USB chip, not the MCU chip. The USB chip is a CP2021 or whatever, it isn't the CH340.

is the Elegoo compatible with the official Arduino program? (1.8.1 to be exact)

While I have not updated to 1.8.1 yet, I have used it with previous versions with no issues, so I see no reason why it should not work with the latest. I have used 3rd party programs and libraries as well.

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ELEGOO UNO R3 Board ATmega328P with USB Cable(Arduino-Compatible) for Arduino | Compatible with Arduino IDE Projects, RoHS Compliant

ELEGOO UNO R3 Board ATmega328P with USB Cable(Arduino-Compatible) for Arduino | Compatible with Arduino IDE Projects, RoHS Compliant

Product ID: 27763963

Details

Brand
ELEGOO
Connectivity Technology
USB
Memory Storage Capacity
32 KB
Model Name
ELEGOO UNO R3
Ram Memory Installed Size
32 KB

⚡16U2 chip for faster USB transfer

🔌100% Arduino IDE compatibility

🛠️ATmega328P MCU for reliable control

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Description

🚀 Elevate your maker game with Elegoo UNO R3 — where pro reliability meets unbeatable value!

ECO FRIENDLY COMPLIANT - RoHS certified for a greener footprint without compromising on quality or reliability.
PRO GRADE MICROCONTROLLER - Powered by the trusted ATmega328P chip, ensuring rock-solid performance for complex builds.
BLAZING FAST USB TRANSFERS - Upgraded 16U2 chip delivers seamless, high-speed data flow for your projects.
PLUG PLAY ARDUINO IDE READY - Zero hassle integration with the official Arduino environment—code, upload, and create instantly.
PRECISION ENGINEERED CONNECTORS - Clear-labeled female headers make wiring intuitive and error-free every time.

The ELEGOO UNO R3 Board features an upgraded 16U2 USB interface chip for faster data transfer and enhanced memory, paired with the industry-standard ATmega328P microcontroller. Fully compatible with the Arduino IDE and RoHS compliant, this board offers precise, clearly labeled connectors for easy wiring and reliable performance, making it a top choice for both hobbyists and professionals seeking a cost-effective, high-quality Arduino clone.

Specifications

ASIN	B01EWOE0UU
Best Sellers Rank	#10 in Single Board Computers (Computers & Accessories)
Date First Available	April 28, 2016
Is Discontinued By Manufacturer	No
Item Weight	0.96 ounces
Item model number	EL-CB-001
Manufacturer	ELEGOO
Product Dimensions	3.15 x 2.36 x 0.39 inches

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