Maximum keys allowed for Pro Micro?

[zer09]

Hello I am existed, I will try to make my first custom keyboard  . and I am sourcing for parts now.

I just want to ask if the Pro Microhttps://www.aliexpress.com/item/ATmega32U4-5V-16MHz-Module-New-Pro-Micro-for-arduino-with-2-row-pin-header-For-Leonardo/32708975582.html can handle 5 x 10 matrix? and also if it is possible to add some LED indicator? and can i use QMK for it?

That a quite a lot of question, but I will appreciate for any help will come.

Thank you.

[tris0908]

The pro micro has 18 usable pins. So it could handle the 5x10 matrix you would want since it will only use 15 pins. As for the LED indicator, i have no prior experience adding one. Try searching the forums for info on adding LED indicators. QMK will work fine with the pro micro.

Sent from my SM-G935F using Tapatalk

[TalkingTree]

and also if it is possible to add some LED indicator?

LED indicators usually require a dedicated pin.

and can i use QMK for it?

Being the Pro Micro an Atmel ATMega32u4 based board, you surely can use QMK.

[Findecanor]

The LEDs are usually put on the PWM-capable pins on port B (PB5, PB6, PB7). PB7 is not available on the Pro Micro. You should also connect each LEDs in series with a resistor.

BTW. Arduino has a werd pin-numbering that does not correspond to the actual port and bit. Do check Deskthority Wiki page on Arduino Pro Micro for a chart. There is some other useful info there as well.

[zer09]

Thank you so much for the replies.