Pro Micro pinout

The Arduino Pro Micro is cheap (~3$) and perfect for small boards (less than 81 keys). With a little hack though, it can drive a keyboard with up to 100 keys.

ATmega32u4 Pinout, Specification & Datasheet

Pro Micro RP2040 Clone by Tweety's Wild Thinking

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Pro Micro: Arduino Pinout - tinkerBOY

Arduino pro micro pinout instalación - Pasión electrónica

ATmega32U4 Pro Micro Controller Board for Arduino Pro Micro Type-C USB 5V US

Pro Micro ATMEGA32U4 Arduino Pins and 5V, 3.3V Explained - Robojax

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Pro Micro 5V/16MHz Arduino Compatible Microcontroller - RobotShop

Arduino Pro Micro - ePro Labs WiKi

AITRIP 2PCS Pro Micro ATmega32U4 5V 16MHz Type-C Development Module Board with 2 Row pin Header Compatible arduino Leonardo Replace ATmega328 Pro Mini : Industrial & Scientific

USB-C Pro Micro issues

Arduino Pro Micro Pinout: Connection Pins for the ATmega32U4-Based Microcontroller

Pro Micro & Fio v3 Hookup Guide by SparkFun Electronics Datasheet