Strange Behavior on DS18B20 Temp sensor and Pull-up Resistor

Hi,

Thanks for answer,
I think i only use one bus on wiring. Because until 3 sensors works with only 1 pull-up resistor.
When i start adding more, have to put more resistors.. but will check it.
Im a newbie. :slight_smile:
Where you saw i use more then one bus and how to spot it?

Best Regards