ESP32 based LoRa Communicator
SD card must be FAT32 formatted and pre-loaded with blank .txt files titled "0.txt" through "9.txt", as well as one "CS.txt".
Non-keyboard parts:
https://www.amazon.com/gp/product/B07Q576VWZ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B07NB3BK5H/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B073C2ZNVV/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B01HHOAQ5A/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B015R62YHI/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B01K1RWAFY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B01HXU1PKS/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B01AHYS7K8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B0784FPF8J/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Keyboard build schematic, parts list, code, and instructions from ElectroNoobs: