What I need to buy (electronics) for make a numpad + calculator with LCD

[mamcx]

I will buy a TKL + numpad. I wish to make the numpad to act as a calculator with a LCD display. I already have the keys, keycaps. But not know what kind of electronics I need.

For the TKL I order a tennsy 2.0. Not know what to buy for the numpad + lcd, etc.

[iamtootallforthis]

Don't know if you have seen this but https://mechanicalkeyboards.com/shop/index.php?l=product_detail&p=2249

[mamcx]

Oh, yes. Something like that was my inspiration. However, I wanna build my own (and already ahve invested in keys, keycaps, etc, only lacking in the electronic side)

[blawb]

If you do it with a teensy or pro micro, then you could make it a fully functional numpad as well as a calculator. You already have caps and switches, so you need a case (a plate at least), diodes, teensy or pro micro, and an LCD screen. There's a ton of options for LCD screens out there. There's also already libraries to come the scene so the more difficult closing is done for you. I would also recommend getting a dip switch to switch between calculator mode and regular numpad mode of you want access to both modes.