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#1 DS18B20: sometimes sensor readings are wrong for 1 sample

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opened 2 years ago by Flo · 1 comments
Flo Kra commented 2 years ago

When this happens the DallasTemperature lib returns a temperature reading of exactly 85 °C which seems to be some error code.

As DS18B20 sensors are used to monitor heating feed/return 85°C is a plausible value, so this needs at least some smart filtering.

Also DallasTemperature does not seem to do a CRC check. Maybe better switch to OneWireOG lib instead.

When this happens the DallasTemperature lib returns a temperature reading of exactly 85 °C which seems to be some error code. As DS18B20 sensors are used to monitor heating feed/return 85°C is a plausible value, so this needs at least some smart filtering. Also DallasTemperature does not seem to do a CRC check. Maybe better switch to OneWireOG lib instead.
Flo Kra commented 2 years ago
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fixed with d5d331e05b -> filter 85° readings if last reading was <80 or >90 -> increase precision of OneWire sensors to 12 bit

fixed with d5d331e05b -> filter 85° readings if last reading was <80 or >90 -> increase precision of OneWire sensors to 12 bit
Flo closed 2 years ago
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