If any one wants to create a mechanical keyboard and use the controller board of the logitech k120 , there are some extra keys on the keymap that are not present on the actual keyboard but was present in the matrix , like the shortcut keys and the volume up and down keys , as well as the power and sleep keys.
This is really cool, thanks! Can you solder to the pins on those controller boards? They look black
Yea the black thing is just graphite on top of copper pad , on the first pin i have scraped it off and the copper is visible so just need to scrape the graphite off and good to solder :)