What are the dimensions for the mounting holes? Center to center and clearance to the nearest board edge

center 2 center 45mm the edge of the hole is 2mm from the edge of the board hole is 3mm dia

Will this work with a canaduino stm32?

I don't believe so for that board. This adapter just brings the pins out to screw terminals, so technically, any board with 15 pins or fewer at .1" spacing and .6 width between rows, would work. The nomenclature would be incorrect then, but it would work electrically.

Will this work with esp8266 node mcu?

This adapter will work with any board that has 15 or fewer pins on each side at .1" spacing and .6" between rows. The nomenclature on the adapter would be wrong, but it will work electrically.

It seems there is no i2c on the a4 and a5 pins. can anyone say where are the i2c pins?

On the Nano, A4 is SDA, and A5 is SCL. If it's not working for you, try swapping the wires on one end. I've had devices that weren't labeled properly and had to do that. I'm using this Nano currently with a i2c real time clock and LCD, and they work fine.

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🚀 Elevate your Arduino game with instant I/O power!

ROBUST BUILD - Durable PCB ensures reliable connections and long-lasting performance in any environment.
PLUG PLAY DESIGN - Quickly connect sensors and modules without soldering—perfect for rapid prototyping.
SEAMLESS EXPANSION - Effortlessly extend your Arduino Nano’s I/O capabilities with this sleek shield.
COMPACT EFFICIENT - Space-saving design fits perfectly on your desk or inside your project enclosure.
UNIVERSAL COMPATIBILITY - Works flawlessly with Arduino Nano V3.0 and ATMEGA328P boards for versatile projects.

The HiLetgo 3pcs Arduino Nano V3.0 IO Shield is a set of three compact expansion boards designed to enhance the input/output capabilities of Arduino Nano and ATMEGA328P microcontrollers. Featuring plug-and-play terminal adapters, these shields simplify wiring and prototyping, supporting both 3.3V and 5V logic levels for versatile project applications.

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RAM	LPDDR2
Wireless Type	802.11n
Brand	HiLetgo
Series	NANO V3.0
Item model number	3-01-1454
Operating System	Windows/macOS/Linux
Item Weight	2.39 ounces
Package Dimensions	4.25 x 3.03 x 1.42 inches
Number of Processors	1
Manufacturer	HiLetgo
ASIN	B073JGV87F
Date First Available	August 16, 2019

HiLetgo3pcs Arduino Nano V3.0 3.0 Controller Terminal Adapter Expansion Board Nano IO Shield Simple Extension Plate for Arduino AVR ATMEGA328P

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