vortex-core-with-display requirements Vortex keyboard that doesn't have led function esp-01 oled display 128x32 adafruit display library esp01 wifi library esp01 wifi manager library How to build upload ino file from this repository to your esp01. Disassemble your keyboard and attach two cables like above. It suppling 3.3 voltage. Desolder two key buttons(I desoldered control key and alt key that i don't usually use). Do like above pics, and attach two cables that you prepared from the first step, to the esp01. black is ground, red is 3.3v. And assemble your keyboard without keycaps. After that, your keyboard will looks like above picture. lastly, solder your 128x32 oled display on the esp01. Be careful for the length of the cables. Done!