I have never been able to get my head around the concept of 'channels'. E.G. In this ESP32 example sketch What is the point behind multiple channels associated with a digital pin? ledcSetup(LEDC_CHANNEL_0, LEDC_BASE_FREQ, LEDC_TIMER_13_BIT); ledcAttachPin(LED_PIN, LEDC_CHANNEL_0); /* LEDC Software F...

With Arduino there is only one SPI interface and when using the SPI library you don't have to specify which pins as the library is hard coded to use the only SPI pins there are. But ESP32 has 4 SPI interfaces, one of which is used to flash the chip, but there are two other SPI interfaces that are ex...