I have create two Git repositorys to teach myself how to use the classic Arduino IDE with Teensy and ESP32 microcontrollers.
You may find that helpful in exploring Teensy/ESP32 and the Arduino IDE yourself.
Here are the links to the respective repositories:
This is a non-profit, free and open source project.
The information on this web site and the documents downloadable from here have been carefully reviewed and is
believed to be reliable, but I do not assume any liability arising out of the application or use of any
documents, programs or circuit described herein.
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other sources I'm refering to.