sensors offset/calibrate suggestion

segalion commented 5 years ago

I open this suggestion here instead on forum proposals, because I think is a suggestion more suitable for developers than for common users. I would like to make some proposals:

Include a 'offset' optional parameter inside sensor object (so all sensor inheritance them), only to "correct" the basic meassurements without need of create a custom template. Imagine you has some ammount of temperature sensors... that you prevously calibrate... you could parametrize some 'offset' for them, so you can easlily calibrate the temperature (i.e. +0.7ºC. or -0.25ºC). Its really usefull for all sensor, and it doesnt increase sensor base complexity.
one-wire prococol could be the id as parameter of name instead of actual opposite: from actual:
```
names:
id: name
```
to the proposed:
```
names:
  name: id
```

With this, you can easily interchange one-wire sensor, or even traslate "id_sensor" to a secrets.yaml to interchange systems...

If you like the callibration (needed usually in lots of analog sensor with probes like pH or ORP electrodes) could be great create a standar calibrate sensor, with those parameter:

sensor:
  platform: calibrate
  entity_id: sensor.to_calibrate
    calibrate:
      from:
      to:
    calibrate_low:
      from:
      to:
    calibrate_high:
      from:
      to:

To get up three-level calibration.

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gingerlime commented 3 years ago

+1 I think it can be a useful feature. Wonder if anybody knows of a workaround to adjust sensors that cannot be calibrated? (e.g. I have a ruuvitag with humidity skewed downwards by around 8%, and there's no way to calibrate the firmware itself).

milleker commented 3 years ago

I've run into this lately with humidity sensors that I want around as perfect to 70% as possible. Sure, I know the offsets, but would really love to be able to get them dialed in natively. I also have some problematic temperature sensors as well that could use this treatment.

I'm going to look at seeing if there's a way to set a script and variable to just add the offset to that in the meantime.

GrinGrin commented 3 years ago

+1 ! I use Oregon Scientific sensors and the barometer show lower value. Previously I used Domoticz and the barometer sensor show a specific field for this type of correction.

Also, if you search for "barometer sensor elevation correction", you'll find a lot of articles about that physical fact as atmospheric pressure is lower when altitude rise.

Here I'm at 188m above the sea (~617 feet) and previously needed to add an offset of 21 hPa to get the same value as the national meteo service for my location.

home-assistant / core

sensors offset/calibrate suggestion #25703