One more try .. I connected only the PWM pin 5 from the Atom with the PWM kit and powered the Atom via USB with no output. But from the layout it should be enough to have only the PWM signal?
And one more thing. If I power the Atom S3 via an USB cable it´s working. Can this be an powering issue?
If sombody want´s to test it .. https://uiflow2.m5stack.com/?pkey=c091fb79f13c4a1f956c407157c7e8fe .. Atom S3 Lite on PWM kit