Lambda for delay switch

ESPHome
1

Hi,
I have no programming background and I am really struggling with esphome lambdas.
What I want to do:
This is part of my irrigation project - in HA I want to be able to define for how long drip irrigation should be on for - for that I want to use input number helper, and use that in esphome as a switch delay value

This is what I have so far:

sensor:
  - platform: homeassistant
    name: Irrigation Duration
    entity_id: input_number.esphome_irrigation_delay_duration
    id: ha_irrigation_duration
  - platform: template
    name: Delay Minutes
    id: delay_minutes
    lambda: |-
      if (id(ha_irrigation_duration).state == 15.0) {
        return 15.0 * 60;
      } else {
        return id(ha_irrigation_duration).state * 60;
      }


switch:
  - platform: gpio
    name: "FlowerBed"
    id: relay1
    pin: 19
    on_turn_on:
      then:
        - lambda: |-
            // Turn off the relay after the delay
            id(relay1).turn_off();
            // Delay the turn off of the relay
            delay(id(delay_minutes).state);

this compiles fine but it seems to crash my nodemcu32 device: here is the log file:

[10:20:35][C][homeassistant.sensor:030]: Homeassistant Sensor 'Irrigation Duration'
[10:20:35][C][homeassistant.sensor:030]:   State Class: ''
[10:20:35][C][homeassistant.sensor:030]:   Unit of Measurement: ''
[10:20:35][C][homeassistant.sensor:030]:   Accuracy Decimals: 1
[10:20:35][C][homeassistant.sensor:031]:   Entity ID: 'input_number.esphome_irrigation_delay_duration'
[10:20:56][D][homeassistant.sensor:024]: 'input_number.esphome_irrigation_delay_duration': Got state 2.00
[10:20:56][D][sensor:127]: 'Irrigation Duration': Sending state 2.00000  with 1 decimals of accuracy
[10:21:05][D][switch:013]: 'FlowerBed' Turning ON.
[10:21:05][D][switch:056]: 'FlowerBed': Sending state ON
[10:21:05][D][switch:017]: 'FlowerBed' Turning OFF.
[10:21:05][D][switch:056]: 'FlowerBed': Sending state OFF
WARNING 192.168.1.7: Connection error occurred: [Errno 104] Connection reset by peer
INFO Processing unexpected disconnect from ESPHome API for 192.168.1.7
WARNING Disconnected from API
INFO Successfully connected to 192.168.1.7

The device starts OK, when I change the value of the input number in HA that is being picked up by the device, when I turn the switch On in HA I can hear the relay click and 1-2 seconds later the switch becomes greyed out in HA and the device reboots.
Any ideas what is going on here and how to fix this?
Thanks

2

Not directly, but a few of things:

  • lambda delays are in milliseconds, and I’ve not seen the syntax you’re using before;
  • why do you think the turn_off will happen after the delay when you’ve written it before?
  • why the if statement in the Delay Minutes template?
  • did you ask ChatGPT to generate this code?

Perhaps try this, assuming your oddly-named delay_minutes template is actually a value in seconds:

sensor:
  - platform: homeassistant
    name: Irrigation Duration
    entity_id: input_number.esphome_irrigation_delay_duration
    id: ha_irrigation_duration
  - platform: template
    name: Delay Minutes
    id: delay_minutes
    lambda: return (id(ha_irrigation_duration).state) * 60;
 
switch:
  - platform: gpio
    name: "FlowerBed"
    id: relay1
    pin: 19
    on_turn_on:
      then:
        - delay: !lambda "return (id(delay_minutes).state) * 1000;"
        - switch.turn_off: relay1
3

Thank you, that is working exactly as I want it.

1 Like
4

is there a way in esphome to create a sensor that would show the time that is left on that timer when the relay is switched on?

5

Probably, but I’d do it in HA myself. This (untested) should evaluate when the switch changes state and at the top of each minute:

template:
  - sensor:
      - name: "Irrigation minutes remaining"
        icon: mdi:timeline-clock-outline
        unique_id: b25c9ee4-42fc-4c77-ae09-7247db316dfb
        unit_of_measurement: 'min'
        state: >
          {% if is_state('switch.flowerbed', 'off') %}
            0
          {% else %}
            {% set elapsed = (now()|as_timestamp -
                              states['switch.flowerbed'].last_changed|as_timestamp(0)) / 60 %}
            {% set total = states('input_number.esphome_irrigation_delay_duration')|int(0) %}
            {{ (total - elapsed)|round(0) }}
          {% endif %}