/* serial_pin_control_with_breathing - take commands from serial and light or extinguish leds based on it Demonstration of taking serial commands while doing something else. */ int max_led=7; int m ...

The analogWriteFrequency function is defined both in esp32-hal.h (as part of the ESP32 core library) and in analogWrite.h (from the ESP32_AnalogWrite library), causing ambiguity.