When you go to elegoo.com and download the .zip for their nano with the ch340, there are a bunch of ch340 drivers. what are these for?

They are for different operating system, say win10 or Mac. Pls. download ans install the driver according to your system.

Does this have bootloader installed ?

I'm surprised by the previous answers - the instructions plainly tell you to install a bootloader. Without the bootloader it may sort of work, but I found that even a simple program would not run properly. So, I recommend resetting, loading the bootloader and then loading your program.

What is the max voltage to power it through vin pin? have used 12v no problem. want to try 16v. description at top says 6-20v, but later says 7-12v.

I have used 16v no problem but 12v is best. Have not used 16v for long duration however. Try it. If damaged it is only $4 lost

Can it be programmed thru the micro-USB port or do you need a special cable connected thru the 6-pin (2x3) header?

They can indeed be programmed through the USB. I haven't even soldered the six pin header on yet. (This package contains 3, and none of the pins are soldered on.) You do need a driver for the USB chipset, but it's easily found on Elegoo's website, and works just great. I really like mine.

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🚀 Elevate Your Projects with the Nano Powerhouse!

BREADBOARD FRIENDLY - Maximize your workspace with a compact design that fits seamlessly on any breadboard.
ENHANCED CONNECTIVITY - More analog input pins than the competition, making your projects more versatile than ever.
UNLEASH YOUR CREATIVITY - Perfect for both beginners and experts, dive into the world of Arduino with ease!
VERSATILE POWER OPTIONS - Power it your way: USB, 7-12V external supply, or 5V regulated—automatically selects the best source.
ROBUST COMMUNITY SUPPORT - Join a thriving community with tutorials and resources to guide your Arduino journey.

The ELEGOO Arduino Nano V3.0 is a compact, breadboard-friendly microcontroller board featuring the ATmega328P and CH340 chips. Weighing just 2.83 grams, it offers 32 KB of memory and multiple power options, making it an ideal choice for both novice and experienced makers. With enhanced analog input capabilities and a user-friendly design, this board is perfect for a wide range of electronic projects.

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Brand	ELEGOO
Series	Nano
Item Height	0.7 Inches
Item Width	0.4 Inches
Product Dimensions	4.83 x 1.02 x 1.78 cm; 2.83 g
Item model number	EL-CB-005
Processor Brand	Atmel
Processor Speed	16 MHz
Processor Count	1
Wireless Type	802.11b
Operating System	FreeRTOS
Are Batteries Included	No
Included Components	[Mini-B USB cable]
Item Weight	2.83 g

ELEGOO for Arduino Nano V3.0, Nano Board CH340/ATmega328P Without USB Cable, Compatible with Arduino Nano V3.0 (Nano x 3 Without Cable)

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