@drjakob I am trying to use it also but it appears to be "down" - based on other posts someone at M5STACK needs to reset their server and delete things in queue?
Don't use it on port A use it only on port B.
Confirmed, the motor doesn't work properly.
I am sure that the unit only works as on or off as it only has an on/off transistor not a PWMable transistor.
