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Sensirion SHT3X Weatherproof

A temperature and humidity sensor in a weatherproof capsule

Image Credit: Sensirion

Modify temperature and relative humidity offset

External sensors offsets can be modified via the control command.

To check available commands (note that you can change sht31 or sht35):

SCK > control ext sht31
Temperature: 
Available commands:
* cal: [float - clear] Sets temperature offset with respect to current offset or clears it

To check the offset currently implemented:

SCK > control ext sht31 temp cal
Current temperature offset: -1.00 (degC)

SCK > control ext sht31 hum cal
Current humidity offset: 3.50 (rh)

Default offsets

The default offsets for external sensors are always 0degC and 0%rh. You can always modify them to suit your needs, or revert back to the default with control temp cal clear or control hum cal clear.

To modify, you can issue the control ext sht31 temp cal command followed by a the offset to add in float notation (for instance -10.0):

Check the calibration and read the current value:

SCK > control ext sht31 temp cal
Temperature: cal
Current temperature offset: -1.00 (degC)
SCK > read ext sht31 temp
Temperature: 25.95 C

Set the temperature offset to -10.0 degC. Note that for the previous reading, there was already an offset of -1.00 degC, so now the offset will be -11.0 degC:

SCK > control ext sht31 temp cal -10.00
Temperature: cal -10.00
SCK > control ext sht31 temp cal
Current temperature offset: -11.00 (degC)
SCK > read ext sht31 temp
Temperature: 15.96 C

To revert to the previous value:

SCK > control ext sht31 temp cal clear
Set default offset: -1.00 (degC)
SCK > control ext sht31 temp cal
Current temperature offset: -1.00 (degC)
SCK > read ext sht31 temp
Temperature: 26.09 C

Additional, for relative humidity:

control ext sht31 hum cal
Current humidity offset: 3.50 (rh)
SCK > read ext sht31 hum
Humidity: 63.06 %

SCK > control ext sht31 temp cal
Ext SHT31 Temperature: cal
Current temperature offset: 0.00 (degC)

SCK > control ext sht31 temp cal -2.00
Ext SHT31 Temperature: cal -2.00
Temperature offset set to -2.00 degC

SCK > control ext sht31 temp cal clear
Ext SHT31 Temperature: cal clear
Set default offset: 0.00 (degC)