Thank you, ajb2k3.
So if I need to include a custom block, it cant be used in M5flow? The strange thing is that the custom block works - I just cant upload the UI flow program after it was saved.
I need a simple way to get a 1-wire temperature sensor (DS18B20) connected and later implement a simple PID temperature control. Any suggestions of how i interface with DS18B20 using M5flow? I really hope I can keep working with M5flow as this makes programming much easier for kids.