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 triple the expansion power!

COMPACT LIGHTWEIGHT - At just 68g total, these shields fit perfectly into any project without bulk.
PLUG PLAY SIMPLICITY - USB connectivity ensures hassle-free setup with your Arduino Nano boards.
TRIPLE EXPANSION POWER - Includes 3 Arduino Nano IO Shields to supercharge your prototyping workflow.
PRO GRADE COMPATIBILITY - Designed specifically for Arduino AVR ATMEGA328P processors for reliable performance.
FUTURE READY INTEGRATION - Supports Linux OS environments and microcontroller projects for versatile development.

The HiLetgo 3pcs Arduino Nano V3.0 IO Shield pack offers three compact, lightweight expansion boards designed for seamless USB connectivity and full compatibility with Arduino AVR ATMEGA328P processors. Perfect for professional developers and makers looking to accelerate prototyping and integrate easily with Linux-based microcontroller projects.

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Brand	HiLetgo
Manufacturer	HiLetgo
Model number	3-01-1454
Item Weight	68 g
Package Dimensions	10.79 x 7.7 x 3.61 cm; 68 g
Item model number	3-01-1454
Processor brand	Atmel
Number of processors	1
Memory Technology	DDR2
Wireless Standard	802.11n
Number of USB Ports	1
Connectivity Technology	USB
Operating System	Linux
Compatible Device	Arduino Boards, Microcontrollers
Included Components	3 * NANO IO Shields for Arduino
Are batteries included?	No

HiLetgo 3pcs 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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