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.

ASIN	B01EWOE0UU
Best Sellers Rank	#20,105 in Computers ( See Top 100 in Computers ) #267 in Single-Board Computers
Brand	ELEGOO
Built-In Media	1 UNO R3 Development Board, 1 USB cable
CPU Model	Cortex A8
CPU model	Cortex A8
CPU speed	0.02 GHz
Compatible Devices	Arduino-compatible devices
Connectivity Technology	USB
Customer Reviews	4.7 out of 5 stars 4,771 Reviews
Global Trade Identification Number	00746591610715
Installed RAM memory size	32 KB
Item Dimensions L x W x H	8L x 6W x 1H centimeters
Item Weight	0.06 Pounds
Manufacturer	Elegoo
Memory Storage Capacity	32 KB
Memory storage capacity	32 KB
Model Name	ELEGOO UNO R3 Board
Model name	ELEGOO UNO R3 Board
Operating System	Windows 10
Processor Brand	Atmel
Processor Count	1
Processor Speed	0.02 GHz
RAM Memory Installed	32 KB
RAM Memory Technology	SRAM
Total Usb Ports	1
UPC	753070352042 719377200394 746591610715
Unit Count	1.0 Count
Wireless Compability	Bluetooth

ELEGOO UNO R3 Board ATmega328P ATMEGA16U2 with USB Cable Compatible with Arduino IDE Projects RoHS Compliant

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