Hello, @jackobocze.
REXYGEN Community Forum is predominantly an english speaking forum.
Please, refrain from using languages other than english. By doing so your comments and contributians can be useful to much larger field of users of this forum.
In the future we would like to keep this forum english only and that could cause comments and contributions written in other languages to be deleted without prior notice.

@reitinge

Již jsem problém vyřešil, problém byl v tom, že jsem napájel pouze Raspberry přes micro-usb, nikoliv Monarco HAT.

Vše funguje tak, jak má.

An update to the above. I'm now very sure I had a bad batch of sensors, it turns out I'm not alone. Over people have seen the same thing having bought sensors from certain websites.

Be careful when buying 1-Wire sensors as it seems there are cheaper, not so reliable ones flooding the market.

Cheers

Mike