Issue: math operations on value sensor trought template

ESPHome
1

Hello there,
I need to measure a differential voltage from an ADC reading through ESPHOME.
The two single voltage potentials are read by means of 2 adc channel
which are:

sensor.clim_AD2_1 
sensor.clim_AD2_2

I would obtain an entity with the difference of this two value in order to get the difference potential
The helper " Combine the state of several sensors" offer just the “add” math operation
So I found this topic with similar issue
https://community.home-assistant.io/t/math-operations-with-a-sensor-value/421054/3

captive_portal:
template:
  - sensor:
      - name: "clim"
        unit_of_measurement: "V"
        state: >
          {% set clim = states('sensor.clim_AD2_2') | float - states('sensor.clim_AD2_1') | float  %}
          {{ clim }}

But it still doesn’t work…I get this error

Failed config

template: [source /config/esphome/clim.yaml:122]
  
  Component template cannot be loaded via YAML (no CONFIG_SCHEMA).
  - sensor: 
      - name: clim
        unit_of_measurement: V
        state: |-
          {% set clim = states('sensor.clim_AD2_2') | float - states('sensor.clim_AD2_1') | float  %} {{ clim }}

Surely it is a dummy syntax or config mistake
Somebody has any suggestions?

2

You are using Home Assistant’s Jinja templates in ESPHome… which will not work.

ESPHome’s Lambdas, aka “Templates”, are completely different. Post your ESPHome device configuration.