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Pro Micro Atmega32u4 5v16mhz Replace Atmega328 For Arduino Pro Mini With 2 Row Pin Header For Leonardo Mini/type-c Usb Interface - Integrated Circuits - AliExpress
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Amazon.com: SparkFun Pro Mini ATmega328-5V/16MHz Development Board Compatible with Arduino Boards and IDE : Electronics
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SparkFun Arduino Pro Mini ATmega328 - 3.3V/8MHz Development Board Incl 8 Analog Pins and 14 Digital GPIO Pins Over Current Protected Regulated DC Input 3.3v up to 12v Small Footprint for Prototyping
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