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

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

Product ID: 257519460

Details

Brand
LAFVIN
Compatible devices
Personal
Hardware interface
USB
Item weight
0.2 Ounces
Style
Compact

⚡5V operating voltage for stable power

🔌CH340G USB interface for seamless connectivity

🧠ATmega328P MCU for reliable Arduino compatibility

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Description

🚀 Elevate your DIY projects with the ultimate Arduino Nano trio—compact, powerful, and ready to innovate!

FULL I O ARSENAL - 14 digital I/O pins, 8 analog inputs, and 6 PWM outputs to handle complex sensor and actuator arrays.
TRIPLE PACK ADVANTAGE - Get 3 Nano V3.0 boards with USB cables—ideal for multitasking or collaborative projects.
PLUG PLAY POWERHOUSE - Runs flawlessly on Arduino IDE with native CH340G USB support for Windows, Mac, and Linux.
VERSATILE POWER OPTIONS - Supports USB power, external 5V-12V DC, and 9V battery for ultimate flexibility on the go.
COMPACT BREADBOARD FRIENDLY DESIGN - Smaller than Arduino UNO, perfect for sleek, space-saving prototyping setups.

The LAFVIN Nano V3.0 is a compact, breadboard-friendly microcontroller board featuring the original ATmega328P MCU and CH340G USB interface. Fully compatible with Arduino IDE and major operating systems, it offers versatile power options and a rich set of I/O ports. This 3-pack bundle includes USB cables, making it perfect for professional-grade prototyping and collaborative development.

Specifications

ASIN	B07G99NNXL
Best Sellers Rank	#165,842 in Computers ( See Top 100 in Computers ) #10,842 in USB Cables
Brand	LAFVIN
Compatible Devices	Personal Computer
Customer Reviews	4.6 4.6 out of 5 stars (2,103)
Hardware Interface	USB
Item Weight	0.2 Ounces
Manufacturer	LAFVIN
Mfr Part Number	LA-020
Model Number	8541582500
Operating System	Linux
Style Name	Compact
UPC	781520418697
Unit Count	3 Count

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¥7096

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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