Help with template sensor calculation

Configuration
1

Hello,

i will use a esp32 with Tasmota 13.0.0 flashed and a SR04 distance sensor connected to measure the volume of my oiltank. Tasmota works fine and i already have the distance entity of the sensor. In the developer tools i tested the syntax for the calucation but i am not able to put it in the configuration.yaml and get the new entities to work. I use the latest version of Home Assistant running on a VM on my NAS. This is the test from the developer tools which works:


{% set sensor = {
  
  "oilmeter_sr04_distance": 6,
  "oilmeter_100percent": 4050,
  "oilmeter_liter": 3915
  
} %}

sensor.oilmeter_liter
{{ (75*75*(180 - sensor.oilmeter_sr04_distance))/1000*4 }}

sensor.oilmeter_percent
{{ 100 / sensor.oilmeter_100percent * sensor.oilmeter_liter }}

This is my attempt in the configuration.yaml

template:
  - sensor:
    # Füllstand in Liter
      - name: oilmeter_liter
        unique_id: oilmeter_liter
        unit_of_measurement: "L"
        state: >-
            {{ (75*75*(180 - states('sensor.oilmeter_sr04_distance')))/1000*4 }}

  - sensor:
    # Füllstand in Prozent
      - name: oilmeter_percent
        unique_id: oilmeter_percent
        unit_of_measurement: "%"
        state: >-
            {{ 100 / 4050 * states('sensor.oilmeter_liter') }}

I think its “just” a problem with the syntax but even after hours try to find the correct syntax it wont work. Please give me a tip what is wrong. thx in advance

2

you need to correctly format all of your code by using three backticks ``` on the line before and the line after the code portion of your post.

without it it’s hard (or impossible) to find syntax errors.

3

thx for your fast reply. I try to fix it. I dont thinks there is a space or something else to much or less. I think “states” in front of the sensor cause the problem.

4

States are strings. You need to convert them to numbers before you can do math with them:

template:
  - sensor:
    # Füllstand in Liter
      - name: Oilmeter Liter
        unique_id: oilmeter_liter
        unit_of_measurement: "L"
        state: >
            {{ (75*75*(180 - states('sensor.oilmeter_sr04_distance')|float(0)))/1000*4 }}
        availability: "{{ states('sensor.oilmeter_sr04_distance')|is_number }}"
  - sensor:
    # Füllstand in Prozent
      - name: Oilmeter Percent
        unique_id: oilmeter_percent
        unit_of_measurement: "%"
        state: >
            {{ 100 / 4050 * states('sensor.oilmeter_liter')|float(0) }}
        availability: "{{ states('sensor.oilmeter_liter')|is_number }}"
5

Thank you very much. Works!

6

Hopping onto the back of this one, as it seems relevant. I’m trying to create (or modify, don’t mind which) another sensor by adding two days from a sensor containing a date “2023-07-26”.

Is the principle the same, as I don’t think I’m even near being right and don’t understand how I’d apply this to a date.

This is what I’ve currently got in the template too but it fails with TemplateSyntaxError: expected token ‘)’, got ‘string’

{% set tomoz = (states'sensor.tracker_date_tomorrow') + timedelta(days=2) %}

7

Your first bracket is in the wrong place. Probably just a typo.

Again, a reminder that states are strings. Make it a datetime first.

{% set tomoz = states('sensor.tracker_date_tomorrow') | as_datetime + timedelta(days=2) %}

You might need to put | as_datetime | as_local instead depending on the timezone of that sensor’s datetime.

8

That’s perfect, thank you :slight_smile: