Just to circle back on this.
I also tried setting the frequency to be a whole multiple of the clock frequency and it still produced jitter.

My conclusion is that, at the frequencies I am working, the ESP32 is not capable of producing a jitter free PWM output.

I tried a few external clock sources ...

Yes I realise it's an Arduino specific call, but what I am saying is that it is mapped to the ESP LEDC calls, so I don't believe that the issue I am experiencing is because I'm using Arduino.

Do you have any feedback on this ... Maybe I have misunderstood, but you seem to be suggesting that the ...

Thanks for the response.

I don't believe the issue is anything to do with using the Arduino IDE, as the "ledc" functions map to the native LEDC functions in the ESP ... as far as I can tell.

The frequency returned from the ledcSetup() function is not the frequency I set, but is instead slightly ...

Hi all,
I am trying to produce a square wave output from the ESP32-WROOM, but the resulting output jitters, rather than being stable.

The desired frequency is around 134.2kHz and I am using the code below to produce it. I am checking the output on an oscilloscope and it appears that the frequency ...