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, 32KB Flash Memory, 16Mhz Clock Speed, 14 Digital I/O Pins, 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

⚡16MHz clock speed

💾32KB flash memory

🔌14 digital I/O pins

4182 kr

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Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Elevate your maker game with ELEGOO UNO R3 – where precision meets power!

BLAZING FAST 16 M HZ CLOCK - Experience seamless project execution with industry-standard speed.
GENEROUS 32 KB FLASH MEMORY - Store complex code effortlessly for advanced Arduino IDE projects.
UPGRADED 16 U 2 USB INTERFACE - Enjoy faster data transfer and enhanced reliability over older models.
VERSATILE 14 DIGITAL I O PINS - Connect multiple sensors and modules for limitless creativity.
100 ARDUINO IDE COMPATIBILITY - Plug-and-play with the world's most popular development environment.

The ELEGOO UNO R3 Board features an ATmega328P microcontroller running at 16MHz with 32KB flash memory, 14 digital I/O pins, and an upgraded 16U2 USB interface for faster data transfer. Fully compatible with Arduino IDE and RoHS compliant, it offers a reliable, professional-grade platform for all your development board needs.

Specifications

ASIN	B01EWOE0UU
Best Sellers Rank	#8 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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