In your ESP32 Thing (USB-C) Hookup Guide, under "Installing Board Definitions in the Arduino IDE you list the https:raw.githubusercontent.com/expressif/arduino-esp32/gh-pages/package_esp32_index.jason file .
When I add this entry to Preferences → Additional Boards Manager URLs and the .json file is installed… There is no entry for the SparkFun ESP32 Thing Plus C. There are only entries for the SparkFun ESP32 Thing, SparkFun ESP-32 Thing Plus and other SparkFun ESP32 variations.
This is contrary to what is shown in the screenshot titled “Selecting the SparkFun ESP32 Thing Plus C from the Tools drop down menu in the Arduino IDE.”.
Is there a different .json file that is needing to be referenced?
However, the changes to the Arduino board add-on are not immediate as this depends on Espressif’s release schedule. Checking with the team that worked on the development board and tutorial, it should be available on the next release. =) We can provide the board add-on if you would like to manually add the board to the variants.
As stated in the tutorial, you can use the ESP32 Dev Module in the meantime. There just may not be certain pins defined:
…Alternatively, users can also select the ESP32 Dev Module; however, they may loose some pin assignments (i.e. LED_BUILTIN).