QMK
Hardware buy boards and switches solder together print enclosure https://www.ebay.com/itm/292337946151 https://chome.nerpa.tech/usb-host-shield-hardware-manual/ Software https://docs.qmk.fm/#/newbs_building_firmware Future work https://docs.qmk.fm/#/feature_macros https://www.seeedstudio.com/Seeed-XIAO-BLE-nRF52840-p-5201.html Ref https://github.com/marcefanitoli/qmk_firmware https://yaowei.dev/posts/usb-to-usb-converter/ https://thomasbaart.nl/2018/12/01/reducing-firmware-size-in-qmk/ https://geekhack.org/index.php?topic=80421.0 https://geekhack.org/index.php?PHPSESSID=hbqhfsa8pkq2ic6376bgdfb6r0hhu5af&topic=69169.0 https://docs.qmk.fm/#/flashing https://blog.lewys.eu/?p=323 https://docs.qmk.fm/#/feature_layers https://github.com/qmk/qmk_firmware/blob/master/docs/feature_dynamic_macros.md https://jayliu50.github.io/qmk-cheatsheet/ https://config.qmk.fm/#/converter/usb_usb/pro_micro/LAYOUT_all https://www.adafruit.com/product/2756