How can I run my sprinkler script only on even-number days?

Configuration
#1

I am violating the “if it ain’t broke, don’t fix it” rule and moving my sprinkler controls from Node Red to Home Assistant.
(I break that rule often). I have the functions mostly finished and learned a bit about automations, scripts and helper entities along the way. (Not that that means I won’t continue to ask stupid questions in the future).

But, I have run into a wall. My town requires that my lawn irrigation can only be run on even-numbered days.
So, how can I run my sprinkler script only on even-number days?

#2

The following template reports true when the current day (of the month) is an even number. Depending on how you have constructed your automation, it can be used in a Template Condition or in a Template Trigger (along with the scheduled time).

{{ now().day % 2 == 0 }}
1 Like
#3

Adding, even seems a bit odd/off… when you run on say 30th July, then the next would be 2nd August…so maybe you mean every 2nd day?

#4

I use garbage collection from hacs.

This is my watering schedule

  - name: Watering Days 
    frequency: "weekly"
    collection_days: 
    - tue 
    - thu
    - sun
    first_month: "apr"
    last_month: "oct"

I then trigger and use the following conditions

  trigger:
  - platform: time
    at: input_datetime.irrigation_valve_on_morning
  - platform: time
    at: input_datetime.irrigation_valve_on_evening
  - platform: time
    at: input_datetime.irrigation_valve_off_morning
  - platform: time
    at: input_datetime.irrigation_valve_off_evening
  condition:
  - condition: state
    entity_id: sensor.watering_days  <--- From garbage collection
    state: '0'
  - condition: state
    entity_id: input_boolean.run_irrigation
    state: 'on'
1 Like
#5

Nope, even/odd based on your address. So with a few 31 day months in the summer, we lose.

#6

Thanks, this looks like it will work.

#7

Kind of had the same problem and it grew into an integration. Check it out - it does odd/even days, days of week, days of month, months of year. GitHub - rgc99/irrigation_unlimited: ♒Irrigation controller for Home Assistant. Good luck.

#8

You’re welcome!

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