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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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

🔌Full Arduino IDE compatibility

🛠️ATmega328P microcontroller powerhouse

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€ 31.99

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Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Elevate your DIY projects with the ultimate Arduino-compatible powerhouse!

PRECISION ENGINEERING - Clear female header prints for easy wiring and error-free connections every time.
ECO CONSCIOUS CERTIFIED - RoHS compliant, combining performance with responsible manufacturing.
PRO GRADE MICROCONTROLLER - Powered by the trusted ATmega328P chip, the heart of countless innovative projects.
PLUG PLAY ARDUINO IDE READY - 100% compatible with Arduino IDE for effortless coding and project integration.
BLAZING FAST USB COMMUNICATION - Upgraded 16U2 chip ensures rapid data transfer and seamless programming.

The ELEGOO UNO R3 Board features the ATmega328P microcontroller and an upgraded 16U2 USB interface chip for faster data transfer. Fully compatible with the Arduino IDE, it offers clear female header markings for easy wiring and is RoHS compliant, making it a reliable and eco-friendly choice for developers and makers.

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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