Does anyone know how to update the bootloader on these boards?

use the ATmega328p (old Bootloader) setting. works good for me

I am unable to upload a sketch to all 3 boards.. even when switching to old bootloader, are they bad boards?

I purchased 2 sets of 3ea LAFVIN boards assembled with headers and USB cables August 2020. Using Arduino IDE 1.8.5 could not upload sketch to Nano. Changed Tools->Board=Arduino/Genuino Uno and was able to upload sketch. The Nano thinks it is a Uno. I do not know if there are any other differences.

What voltage battery for these?

Variable. Can connect to USB via mini-USB connecor. Higher voltages up to 9V can connect to power pins

"irremote library by sherriff" compatibility.... having eliminated most other issues, i suspect incompatibility. any btdt or advice?

Sometimes these ship without bootloaders. You will have to flash it yourself if that’s the case. This can be done with a known good Arduino.

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Nano V3.0, Nano Board ATmega328P 5V 16M Micro-Controller Board Compatible with Arduino IDE (Nano x 3 with USB Cable)

Product ID: 72633833

Details

Brand
LAFVIN
Compatible Devices
Personal
Hardware Interface
USB
Item Weight
5.67 g
Style
Classic

⚡16MHz clock speed

💻USB CH340G interface

🔌5V power supply

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Description

🚀 Elevate your DIY projects with the Nano V3.0 – power, precision, and portability in one sleek board!

TRIPLE PACK VALUE - Get 3 Nano V3.0 boards with USB cables—ideal for prototyping or team collaboration.
POWERFUL A TMEGA 328 P MCU - Runs at 16MHz for smooth, reliable microcontroller performance.
PLUG PLAY USB CH 340 G CHIP - Fast and stable USB connection replacing older FT232RL standards.
COMPACT BREADBOARD FRIENDLY - Smaller than classic boards, perfect for sleek, space-saving projects.
SEAMLESS CROSS PLATFORM COMPATIBILITY - Works flawlessly on Windows, Mac, and Linux for ultimate flexibility.

The Nano V3.0 by LAFVIN is a compact, breadboard-friendly microcontroller board featuring the original ATmega328P running at 16MHz with a 5V power supply. It uses the upgraded CH340G USB interface for seamless programming across Windows, Mac, and Linux. Sold in a convenient 3-pack with USB cables, it offers reliable performance compatible with the Arduino IDE, perfect for professional-grade prototyping and development.

Specifications

ASIN	B07G99NNXL
Best Sellers Rank	#759 in USB Cables
Brand	LAFVIN
Compatible Devices	Personal Computer
Customer Reviews	4.5 4.5 out of 5 stars (2,258)
Hardware Interface	USB
Item Weight	5.67 g
Manufacturer	LAFVIN
Mfr Part Number	LA-020
Model Number	8541582500
Number of Items	3
Number of Packs	3
Operating System	Linux,Mac,Operating,Windows
Style Name	Classic
UPC	781520418697
Unit Count	3 Count

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C$1681

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Nicaragua.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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