Many of my sensors show a temperature of 85 degrees during deploy, it is interesting that they do it for a different period of time. What caused this?
Hi @devifast
A simple search :
The power-on reset value of the temperature register is +85°C
This seems to indicate, this is the state the sensor is in after it has been reset, so a deploy will support this theory.
Source : https://www.analog.com/media/en/technical-documentation/data-sheets/DS18B20.pdf
I am not an electronics engineer, but its the best I can do.
How did you wire them?
As Marcus says, this indicates that the sensor has been reset. Just add a Switch node that blocks that value.
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Understood.
Hi,
I am not sure what you have this attached to, to get the temperature value, but I hope you are waiting 750ms before the first reading of the data from the DS1820 ?
Normally the 1-wire driver will cope with that.
Thanks for the reply. The reading interval is 10 seconds. It will probably turn out to be a bad sensor.
There are a LOT of cheap fake DS18b20's on offer unfortunately. Best to buy from a reputable dealer.
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That applies to lots of sensors, and devices not just 18b20
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