Amazon.com: AITRIP Pro Micro ATmega32U4 5V/16MHz Module Board, Replace with ATmega328 Pro Mini Compatible with Arduino with 2 Row pin Header 10pack : Industrial & Scientific
Pro Micro & Fio V3 Hookup Guide - SparkFun Learn
Problem with I2C communication between PRO MICRO and NodeMCU V3 - Networking, Protocols, and Devices - Arduino Forum
Introduction to Arduino Pro Micro - The Engineering Projects
KS0503 Keyestudio PRO MICRO 5V 16MHZ Development Board(Black and Eco-friendly) - Keyestudio Wiki
Arduino Pro Mini Pinout, and Specifications(Explained)
Pro Micro : how do I use a serial interface to communicate with a device? - Microcontrollers - Arduino Forum