My smart irrigation approach is now working.
Devices:
- MQTT Weatherstation
- MQTT Waterpump
- MQTT Flowrate Sensor
I use the Sparkfun Weatherkit as weatherstation and measure the rainfall over 24h.
At 22:00 hrs I start my irrigation automation. It checks how much rain has fallen and calculates the difference between a set value and the rainfall of the last 24h. I convert it to a duration. The coefficient for this conversion is determined by averaging the flow rate of the waterpump over a single irrigation cycle.
I then store this duration and scripts use this input_number as input for a delay statement. Thus, each sprinkler is active for a specific fraction of the residual cycle duration.
Automations:
- alias: Count_Rain_Ticks
id: irrigation1
trigger:
- platform: mqtt
topic: garden/weatherstation/rain
action:
- service: counter.increment
entity_id: counter.rain_tick_cnt
- delay:
seconds: 1
- service: input_number.set_value
target:
entity_id: input_number.current_rainfall
data:
value:
"{{ states('counter.rain_tick_cnt') | float * 0.2794 | float }}"
- alias: Reset_Rain_Counter
id: irrigation2
trigger:
- platform: state
entity_id: counter.executed_irrigation
to: '2'
action:
- service: counter.reset
entity_id: counter.rain_tick_cnt
- service: counter.reset
entity_id: counter.executed_irrigation
- service: input_number.set_value
target:
entity_id: input_number.current_rainfall
data:
value: 0.0
- alias: Bewässerung Hinten
id: irrigation3
trigger:
- platform: time
at: '22:00:00'
condition:
condition: and
conditions:
- condition: time
weekday:
- mon
- tue
- wed
- thu
- fri
- sat
- sun
- condition: numeric_state
entity_id: input_number.current_rainfall
below: 1.0
action:
- service: input_number.set_value
target:
entity_id: input_number.total_irrigation_duration_back
data:
value: >
{% set total_rainfall = states('input_number.current_rainfall') | float %}
{% set total_irrigation_volume = ( 1.0 - total_rainfall ) | float * 237.0 %}
{% set irrigation_cycle_time = total_irrigation_volume | float / 0.1562 %}
{% if total_irrigation_volume > 50.0 %}
{{ irrigation_cycle_time }}
{% else %}
0.0
{% endif %}
- delay:
seconds: 1
- service: script.irrigation_back
Script (reduced):
irrigation_back:
alias: "Hinten Bewässerung"
sequence:
# Pump on
- service: switch.turn_on
entity_id: switch.waterpump_garden_back
# Sprinkler 1 on
- service: switch.turn_on
entity_id: switch.waterhub_back_valve_3
- delay:
seconds: "{{ states('input_number.total_irrigation_duration_back') | float * 0.0625 }}"
- service: switch.turn_off
entity_id: switch.waterhub_back_valve_3
# Sprinkler 2 on
- service: switch.turn_on
entity_id: switch.waterhub_back_valve_4
- delay:
seconds: "{{ states('input_number.total_irrigation_duration_back') | float * 0.0625 }}"
- service: switch.turn_off
entity_id: switch.waterhub_back_valve_4
# Pump off
- service: switch.turn_off
entity_id: switch.waterpump_garden_back
- service: counter.increment
entity_id: counter.executed_irrigation
It is still not complete. I want to take the season and temperature for the number of irrigation cycles into account.
If some is interested in more details, I am happy to share.
Best
Ck
