Pro Micro pinout
![Pro Micro pinout](https://golem.hu/pic/pro_micro_pinout.jpg)
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.
![](https://europe1.discourse-cdn.com/arduino/original/4X/4/0/4/404bf84dbc6f63b36f434b61140e5a08366b77fd.png)
Using 24 inputs of an Arduino Micro? - Microcontrollers - Arduino Forum
![](https://mechboards.co.uk/cdn/shop/products/pro-microanobrcp0415753-799790.jpg?v=1704519596)
Pro-Micro – Mechboards
![](https://nullbits.co/static/img/bitc_pro_pinout.png)
Bit-C PRO
![](https://keeb.io/cdn/shop/files/FullSizeRender_860x.heic?v=1699572443)
RP2040 Pro Micro 16MB/128Mbit USB-C Controller – Keebio
![](https://www.tinkerboy.xyz/wp-content/uploads/2018/06/IMG_1685-1.jpg)
Pro Micro: Arduino Pinout - tinkerBOY
![](https://a2delectronics.ca/wp-content/uploads/2018/05/Arduino-Pro-Micro-32u4.jpg)
Arduino Pro Micro 32U4 - A2D Electronics
![](https://www.robotshop.com/cdn/shop/products/pro-micro-arduino-compatible-microcontroller-1_1_f0f29962-79d2-4aba-916f-2af910ea06a1_800x.jpg?v=1701226134)
Pro Micro 5V/16MHz Arduino Compatible Microcontroller - RobotShop
![](https://1.bp.blogspot.com/-8O8OpY9of74/WnC4qyLVQpI/AAAAAAACNhA/-Gn6YHP4WdggENojT_GyBl1JgHw-z3MlQCLcBGAs/s1600/MVIMG_20180130_080416.jpg)
40% Keyboards: Pro Micros
![](https://www.pikatea.com/cdn/shop/files/IMG_0754.jpg?v=1704317015)
RP2040 Pro Micro MCU
![](https://europe1.discourse-cdn.com/arduino/original/4X/e/d/6/ed6396ea44ec7c21e478a31835cbe1a05bbf2b30.png)
Arduino Pro micro - micro usb connector detached - IDE 1.x - Arduino Forum
![](http://kmkfw.io/assets/images/pro_micro_pinout-dda893f2750aa0d840b62acc142d76d2.png)
Quickpin
![](https://cdn.sparkfun.com/assets/parts/9/3/2/6/12640-01a.jpg)
Pro Micro - 5V/16MHz - DEV-12640 - SparkFun Electronics
![](https://preview.redd.it/41opo6sv56c81.png?width=640&crop=smart&auto=webp&s=a4a6ac443fae3954353657f0a42125aba2bda697)
STeMCell - STM32 based pro micro pinout : r/ErgoMechKeyboards
![](https://content.instructables.com/FAL/NTDV/JGWJ5O90/FALNTDVJGWJ5O90.png?auto=webp&fit=bounds&frame=1&height=1024&width=1024auto=webp&frame=1&height=150)
Fixing an Arduino Pro Micro: the USB Port Came Off !! : 17 Steps - Instructables