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Amazon.com: 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
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Introduction to Arduino Pro Mini Board (AVR Atmel Atmega328p) Pinout, Schematics and Features - YouTube
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