@felmue thank you Felix, that is very helpful and explains. Will check out other pin. Thanks!

I am using OneWire on Pin19 as digital inputs 1,2,3,5,16,17 used. Now I see conflict when initializing SD card. Is File management / SD card management also using Pin 19? Other pin I could use beyond those occupied already?

@felmue thank you very much for your help!

I wanted to measure temperatures with DS18B20 and M5stack using OneWire. Which pin do I need to connect the DATA wire (yellow)?