Hi @StefanL38, the code appears to be stuck flashing just once for the blue (on and off) when the button is pushed the first time then the second button push stops the blue flashing but the strobe effect does not function. I have tried to work through the myStateMachine case's but am not having much luck getting anything to work any better. I have found your article A Demo-Code explaining the switch-case state-machine and how to do things (almost) in parallel