Hi there,

according to the specification of the DS18B20 sensor,

The power-on reset value of the temperature register is +85°C (Page 6).

So, we might think about checking for this value (0550h) and masking it appropriately in order to prevent propagating this reading accidentally as a valid one.

See also https://community.hiveeyes.org/t/untersuchung-und-verbesserung-des-timings-bei-der-ansteuerung-der-ds18b20-sensoren-unter-micropython/2309/77.

With kind regards,
Andreas.