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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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)

Product ID: 353291701

Details

Brand
ELEGOO
CPU speed
16 MHz
Installed RAM memory size
2 KB
Memory storage capacity
32 KB
Model name
ELEGOO Nano

⚡16 MHz clock speed

📏Compact 18x45 mm footprint

🔋7-12V auto power selection

Description

🚀 Tiny board, massive potential—power your next breakthrough with ELEGOO Nano V3.0!

TRIPLE PACK VALUE - Get three Nano V3.0 boards in one kit—perfect for multitasking or sharing your innovation with your team.
EXPANDED ANALOG INPUTS - Access 8 analog I/O pins for versatile sensor integration beyond standard Arduino boards.
FLEXIBLE POWER OPTIONS - Seamlessly switch between USB, 7-12V unregulated, or 5V regulated power sources with automatic voltage selection.
BREADBOARD READY COMPACT DESIGN - Maximize your prototyping space with a sleek 18x45 mm form factor that fits perfectly on any breadboard.
ROBUST A TMEGA 328 P MICROCONTROLLER - Harness 32 KB flash memory and 2 KB SRAM for smooth, reliable Arduino projects.

The ELEGOO Nano V3.0 is a compact, breadboard-friendly microcontroller board powered by the ATmega328P chip, offering 32 KB flash memory, 8 analog inputs, and flexible power options including USB and 7-12V external supply. This triple-pack kit is ideal for professional makers and engineers seeking a reliable, space-saving Arduino-compatible solution for rapid prototyping and development.

Specifications

ASIN	B0713XK923
Best Sellers Rank	#169,400 in Computers ( See Top 100 in Computers ) #2,782 in Single-Board Computers
Brand	ELEGOO
Built-In Media	Mini-B USB cable
Compatible Devices	Arduino Nano V3.0, various devices with Mini-B USB, and devices compatible with the Mini or Basic Stamp pin layouts (such as certain boards from Arduino, Adafruit, or SparkFun)
Connectivity Technology	GPIO, I2C, USB
Customer Reviews	4.6 4.6 out of 5 stars (1,768)
Item Dimensions L x W x H	45L x 18W x 10H millimeters
Item Weight	0.1 Ounces
Manufacturer	ELEGOO
Memory Storage Capacity	32 KB
Mfr Part Number	EL-CB-005
Model Name	ELEGOO Nano Board
Model Number	CA-EL-CB-005
Number of Items	3
Number of Packs	1
Operating System	FreeRTOS
Processor Brand	Microchip Technology
Processor Count	1
Processor Speed	16 MHz
RAM Memory Installed	2 KB
RAM Memory Technology	SRAM
Total Usb Ports	1
Unit Count	3.0 Count
Wireless Compability	802.11b

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