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 Elegoo Nano!

BREADBOARD FRIENDLY - Maximize your workspace with a compact design that fits seamlessly.
USER FRIENDLY SETUP - Easily download drivers and get started in no time.
ENHANCED CONNECTIVITY - More analog inputs for your creative projects.
VERSATILE POWER OPTIONS - Power it your way: USB, unregulated, or regulated supply.
COMPATIBLE WITH ARDUINO ECOSYSTEM - Join a community of innovators with this versatile board.

The ELEGOO Nano V3.0 is a compact, breadboard-friendly microcontroller board featuring the ATmega328P and CH340 chips. It offers versatile power options, enhanced analog inputs, and compatibility with the Arduino ecosystem, making it an ideal choice for both beginners and experienced makers.

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Processor	16 MHz
RAM	SRAM
Wireless Type	802.11b
Brand	ELEGOO
Series	Nano
Item model number	EL-CB-005
Operating System	FreeRTOS
Item Weight	0.1 ounces
Product Dimensions	1.9 x 0.4 x 0.7 inches
Item Dimensions LxWxH	1.9 x 0.4 x 0.7 inches
Color	Nano 3.0 x 3 without cable
Processor Brand	Microchip Technology
Number of Processors	1
Manufacturer	ELEGOO
ASIN	B0713XK923
Is Discontinued By Manufacturer	No
Date First Available	May 3, 2017

ELEGOO 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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