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Pro Micro Atmega32u4 3.3v Microcontroller Module 8mhz Spi Interface System Development Board For Arduino Replace Atmega328 - Integrated Circuits - AliExpress
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Arduino Pro Mini DETAILS Microcontroller ATmega168 Operating Voltage 3.3V or 5V Input Voltage 3.35 -12 V (3.3V model) or 5 - 12
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Introduction to Arduino Pro Mini Board (AVR Atmel Atmega328p) Pinout, Schematics and Features - YouTube
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