Some of the solutions to the software timing are made up for with the hardware on the specific Arduino he chose to use, including an even system, a speedy EEPROM, hardware timers, and an ADC that ...

Since Arduino-ESP32 2.0.14, using an ADC read operation in ESP32 ULP FSM co processor will cause the ULP to get "stuck". I am including minimal code to reproduce. Expected: wake due to an ULP wake ...