https://rtr.ca/hbg3/ I've made this alternative location for documentation and files for the Celestron Homebrew Gadget 3 by Mark Lord. This will be removed if an official GitHub becomes available.
Version history on Mark's website
Check the Wiki for an evolving guide
CloudyNights dew control thread
BIN file for direct flashing This link will always download the latest binary file direct from MLORD - the creator. It is the fastest and less fuss method for getting the code onto an ESP32. See the WiKi for full step by step.