Sun elevation based on percentage of day

Configuration
,
1

Hi,

I am trying to create a template sensor which calculates the percent of daylight that has elapsed.
i have some coding skills but this seems to be a bit out of my league.

I’m trying to create a sun elevation card (with picture elements).
To account for the daily change of the amount of daytime i thought a percentage would work to define picture elements for the different sun elevations

example

I found some code snippets here and there and put them together in the template editor… but it doesnt seem to work…

- platform: template
  sensors:
    day_percentage:
      friendly_name: "Percentage of day"
      value_template: >-
        {% set total_daylight = states('sensor.daylight_hours')  %}
        {% set daylight_remaining = as_timestamp(state_attr('sun.sun','next_setting') | float - now().timestamp() | int  ) | timestamp_custom('%H:%M', false)  %}

        {{ (daylight_remaining/total_daylight)*100 }}

Can anyone help me?
thanks

2

Check this

1 Like
3

You were close, but brackets in the wrong place and more type conversions than you needed. Try this line:

{% set daylight_remaining = (state_attr('sun.sun','next_setting')|as_timestamp - now()|as_timestamp)|timestamp_custom('%H:%M', false)  %}

That’s a string, though (like you asked for with timestamp_custom) and your final line then makes no sense. What does {{ states('sensor.daylight_hours') }} return?

4

you should have a look at GitHub - pnbruckner/ha-sun2: Home Assistant Sun2 Sensor which provides several sensors out of the box that you could use.

I use some of them to build templates like:

      daylight_remaining_min:
        friendly_name: Daylight remaining minutes
        value_template: >
          {% set nw = now() %}
          {% set sr = state_attr('sensor.astral_sunrise','today') %}
          {% set ss = state_attr('sensor.astral_sunset','today') %}
          {% if nw < sr %}
            {{((ss - sr).total_seconds()/60)|int}}
          {% elif nw < ss %}
            {{((ss - nw).total_seconds()/60)|int}}
          {% else %}
            0
          {% endif %}
#          {{((as_timestamp(state_attr('sun.sun','next_setting')) - now().timestamp())/60)|int}}
        unit_of_measurement: min

      daylight_remaining_hm:
        friendly_name: 'Daylight remaining hh:mm'
        value_template: >
          {% set nw = now().replace(microsecond=0) %}
          {% set sr = state_attr('sensor.astral_sunrise', 'today') %}
          {% set ss = state_attr('sensor.astral_sunset', 'today') %}
          {% if nw < sr %}
            {{ ss - sr }}
          {% elif nw < ss %}
            {{ ss - nw }}
          {% else %}
            0:00:00
          {% endif %}

creating a percentage sensor should not be too difficult

1 Like
5

It returns the total amount of daylight time.
I’ll give it a try this afternoon and get back to you!
The final line is where the template editor started giving me the error:
TypeError: unsupported operand type(s) for /: ‘str’ and ‘str’

I’m trying to make a percentage… and that is how far I got with the calculations :upside_down_face:

I’ve used the final line before in a different sensor that works…
It might be that i cant do these calculations with time?

example of the working sensor:

- platform: template
  sensors:
    corona_change:
      friendly_name: "Inzidenz Change"
      value_template: >-
        {% set n = states('sensor.sk_koln_newcases') | float %}
        {% set r = states('sensor.sk_koln_newrecovered') | float %}
        {% set d = states('sensor.sk_koln_newdeaths') | float %}
        
        {{ (n - (r+d)) | round(0) }}

Thanks for the help

6

Thanks. Ill look into that!

7

Not with strings like “03:34”, no. You should read and get familiar with this:

Sensors’ states are always strings, even if they look like numbers. You need to turn them into numbers using |int or |float before doing any arithmetic on them.

You’ll probably find it easier to convert all the times you’re working with into UNIX timestamps (seconds since 1970; all documented at the link above), so you end up with seconds of daylight and seconds until sunset.

8

I’ve been searching for this exact type of card and is basically what I’m trying to achieve with the calculations. Thanks!

1 Like