Editing Arduino Pro Micro (section)

==Clones==
* See the [[:Category:Pro Micro|Pro Micro]] category for controller boards that are pin-compatible.
* See the [[:Category:ATmega32U4|ATmega32U4]] category for controller boards with the same microcontroller (but different pinout).

Beware that there are clones that differ from the original in incompatible ways:

;Longer circuit board
:Pin-compatible alternatives for the keyboard community may be longer for extra functionality, such as fitting a USB-C port (which is larger), more pins, buzzer (for "click") and/or circuitry for a Bluetooth transceiver. They will not fit all keyboard PCBs or cases.

;Wider circuit board
:Wider, with the rows of pins one or two positions farther apart.<ref name="40pcclones">40 Percent Club—[http://www.40percent.club/2018/08/another-black-pro-micro-thats-not-right.html Another black Pro Micro that's not the right size.]. Dated 2018-08-08. Retrieved 2019-09-03</ref> These will not fit a (keyboard) PCB made for the proper hole spacing.

;Shorts VBUS to Vcc
:Some 5V clones have no 5V voltage regulator and diode or connect the regulator only to the RAW pin. This can be a problem for some [[Ergonomic keyboard#Split|split]] keyboards with a Pro Micro in each half of which only one is connected to the host: voltage on the VBUS input is usually used to determine which side should be master and which should be slave.

;8 MHz crystal
:Both 5V and 3.3V Sparkfun Pro Micros have a 16MHz clock crystal. The max clock for 3.3V is 8 MHz, and software intended to run on Pro Micros at 3.3V could set the prescaler to halve the input frequency — and then instead run at 4 MHz.

;Wrong pinout
:Pro Micro clones with USB-C have been spotted where the PB1 and PB3 pins have been swapped.<ref name="tztclonereddit">Reddit /r/MechanicalKeyboards: [https://www.reddit.com/r/MechanicalKeyboards/comments/qi1k2f/beware_of_the_usbc_pro_micro_clones/ BEWARE of the USB-C Pro Micro Clones]. Dated 2021-10-28. Retrieved 2021-11-01</ref>