Adding offset to sensor data

Configuration
#1

Hello,

I already used the search function and also found the thread https://community.home-assistant.io/t/add-temp-offset-with-sensor-template/16114.
But I don’ t get it working.
How can I add a offset to my sensor data?
How can I hide the sensor DHT22 and only show the sensor value from the template?
From where do I get these entity_id, I found them in the database, is it the right way to get the names?

sensor:
  - platform: dht
    sensor: DHT22
    pin: 4
    monitored_conditions:
      - temperature
      - humidity
  - platform: template
    sensors:
      dht_sensor_humidity:
        value_template: '{{states.sensor.dht_sensor_humidity.state | float + 4}}'
        friendly_name: 'Test'
Sensor Value Offsets
#2

You can get entity_id’s by clicking the “States” button under Developer Tools in the Home Assistant sidebar.

Find the entity_id for your DHT22 Humidity. It should show the current humidity level under the “State” column.

In your example, replace

value_template: '{{states.sensor.dht_sensor_humidity.state | float + 4}}'

with the name of the DHT22 Hudity Sensor’s entity_id.

value_template: '{{states.sensor.XXXXXXXXX.state | float + 4}}'

#3

Thank you for your reply, the entity_id is right. But it seems not to work. The following should work, but it does not.
value_template: '{{states.sensor.dht_sensor_humidity.state | float + 4}}'
If I enable the template, it seems like it generates too much data or something wents wrong as the raspberry gets really slow if I add the template.

I’ ll try something similar tomorrow with a dummy sensor.

#4

You are adding 4 to itself.

  - platform: template
    sensors:
      dht_sensor_humidity:
        value_template: '{{states.sensor.dht_sensor_humidity.state | float + 4}}'
        friendly_name: 'Test'

With this code, you have created a template sensor, and you are taking the value from the template sensor that you just defined and adding 4 to it.

What you want to add 4 to is the DHT sensor which is defined previously. You should be able to find the entity id of that sensor in the developer tools.

#5

Thank you. Now I found a solution. Hopefully the following information will also help others.

To hide the original sensor data (which is defined in sensors) use customize. Syntax for customize is sensor.enitity_id:

homeassistant:
  customize:
    # Add an entry for each entity that you want to overwrite.
    sensor.dht_sensor_humidity:
      hidden: true

Sensor section: Define the sensor (in my case dht).
Create a new entitiy_id with platform: template and the name sensor.dht_sensor_humidity_offset which includes the offset (in this example 4).

sensor:
  - platform: dht
    sensor: DHT22
    pin: 4
    monitored_conditions:
      - temperature
      - humidity
  - platform: template
    sensors:
      dht_sensor_humidity_offset:
        value_template: '{{states.sensor.dht_sensor_humidity.state | float + 4}}'
        friendly_name: 'Test'
3 Likes
#6

Guys, sorry for digging this very old post but need your help: I’ve got a humidity sensor which is definitely not properly calibrated and wanted to assign to its output a -8 (%) offset.
I’ve learned from your posts and basically added following lines to my configuration.yaml.

   - platform: template
     sensors:
       sonoff_th16_01_am2301_humidity:
         value_template: '{{states.sensor.sonoff_th16_01_am2301_humidity.state | float - 8}}'
 friendly_name: 'Test'

The strange thing is that, when I try to graph the new sensor values, it is shown as an history chart instead…

CaptureHUMIDITY
Light blue line (“camera bambine”) is the value I would like to correct and the history on top is the corrected value (offset -8).
Any idea?
Thanks, cheers.

#7

Add

           value_template: .......
           unit_of_measurement: '°'
#8

I use the following code. it uses the state() rather than states.senso…

which means less errors on start up.

I also define the device class to set the icons and etc, the same as all the other temp sensors.

I haven’t calculated the offset yet, in the below example. but you just adjust the 0.0 as required.

  - platform: template
    sensors:
      family_room_temperature:
        friendly_name: "Family Room - Temperature"
        value_template: "{{ states('sensor.motion_family_temperature_raw') | float + 0.0}}"
        device_class: temperature
        unit_of_measurement: '°C'
2 Likes
#9

It would be nice to have a feature that applies the offset only under certain conditions.

I have all lights energy consumption calculated according to some measurements but then I gather power/energy data from plug and the digestor has lights and ventilations, thus the lights are included through the plug, which I’d like to deduce from the digestor power consumption as I calculate them indirectly based on data/brigthness etc as all the flat, not directly as through meteres in plugs.

#10

If you go to developer tools, then template and “reset to demo template”. There’s some example there with IF statements that you could use to accomplish this.