This will be a walkthrough on how I made my own custom keyboard, starting from complete beginner in PCB design software, keyboard design, etc. The keyboard’s code and everything related to it can be found here. > fzf old keyboards # My first split was Mitosis, a 46 key split wireless keyboard based on nRF51822, a Bluetooth-enabled microcontroller, which was used for communication between the two halves and the receiver that was eventually connected with the host.