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
0.2 Ounces
Style
Classic

⚡5V Operating Voltage

🔌USB Mini-B Power & Programming

🧠ATmega328P 16MHz MCU

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Description

🚀 Nano V3.0: Power your ideas with compact precision and pro-level compatibility!

TRIPLE PACK VALUE BUNDLE - Get 3 Nano V3.0 boards with USB cables—perfect for scaling your projects or sharing the innovation.
CROSS PLATFORM COMPATIBILITY - Works flawlessly on Windows, Mac, and Linux with CH340G driver support.
ROBUST A TMEGA 328 P MICROCONTROLLER - 16MHz 8-bit AVR MCU ensures reliable, high-performance embedded projects.
BREADBOARD FRIENDLY COMPACT DESIGN - Fits perfectly on breadboards for rapid prototyping and clean setups.
PLUG PLAY USB POWER PROGRAMMING - Seamlessly power and program via Mini-B USB without extra adapters.

The LAFVIN Nano V3.0 is a compact, breadboard-friendly microcontroller board powered by the ATmega328P running at 16MHz. It features a CH340G USB interface for seamless programming and power via Mini-B USB, supports 5V logic, and offers 14 digital I/O pins plus 8 analog inputs. Fully compatible with Arduino IDE and major OS platforms, this triple-pack bundle is ideal for professionals and makers seeking reliable, cost-effective prototyping tools.

Specifications

ASIN	B07G99NNXL
Best Sellers Rank	#637 in USB Cables
Brand	LAFVIN
Compatible Devices	Personal Computer
Customer Reviews	4.5 4.5 out of 5 stars (2,245)
Hardware Interface	USB
Item Weight	0.2 Ounces
Manufacturer	LAFVIN
Mfr Part Number	LA-020
Model Number	8541582500
Operating System	Linux,Mac,Operating,Windows
Style Name	Classic
UPC	781520418697
Unit Count	3.0 Count

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€ 29.10

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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TrustScore 4.5 | 7,300+ reviews

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