This 12X scale model Arduino runs on an actual Arduino

When you need a way to fit a microcontroller into a small space, the Arduino Nano is a great choice. If you need significant IO, the Mega is a go-to option. But if you need something physically very large, with the power and look of an Uno, the “Arduino Giga” by Zach Hipps of byte sized may […]

SparkFun Teensy LC ARM Cortex M0+ - compatible Botland - Robotic Shop

SparkFun Qwiic Pro Micro - USB-C (ATmega32U4) - Compatible with Arduino development board 5V/16MHz microcontroller AP2112 3.3V Voltage Regulator Castellated PTH pin pads Reset button Maximum 6V input : Electronics

DS3231 (Real Time Clock) with Arduino - zkl doc

μduino May Be the World's Smallest Arduino Board (Crowdfunding) - CNX Software

Comparison of single-board microcontrollers - Wikipedia

Brushless 12 Click

2-Part ProMini Logger that runs >1 year on a Coin Cell

Adafruit METRO 328 - Arduino Compatible - with Headers [ATmega328] : ID 2488 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits

Pressure 19 Click

PD Micro

DIY — Arduino Official Store