Hypothetical Project question

[mfalkvidd]

@mrhutchinsonmn do you mean that you want to trigger the pump or the Arduino? (”It” is a bit ambigous in your post)

[mrhutchinsonmn]

I need to trigger the relay on/off (via wireless) that is connected to the power of the pump via an arduino nano.

[mfalkvidd]

@mrhutchinsonmn thanks for explaining. This project definitely sounds doable.

[Grubstake]

@mrhutchinsonmn
I agree with the previous responses.

I know you said wireless, but if feasible I would strongly favor 100 feet of direct-burial irrigation cable and a relay for pump, and a hardware float switch, for simplicity and reliability.

[mrhutchinsonmn]

I am ready to start dinging around with one sensor state controlling a 2nd sensor, using Home Assistant as the controller but I am not finding what I am looking for. I need the state (on/off) of sensor 1 to signal sensor 2 to turn on/off (turn relays on/off) . I am assuming that will require a script setup on Home Assistant to do this.

Just need some examples (sketches) and supporting docs. It was mentioned this could be accomplished with the irrigation project build (which I plan on implementing) but for now, I just want a pinout high on relay-1 to trigger a 2nd relay to also go high (via wireless) .

Maybe this question is for Home Assistant? Not sure.

[skywatch]

A simple test would be to build.....
https://www.mysensors.org/build/binary - For the sending node.

and...
https://www.mysensors.org/build/relay - for the receive end (at the pump).

I can't help with HA as I have never used it, but this setup is as good a start as you will get and you'll learn lots tinkering with it! ;)

[mrhutchinsonmn]

I decided to look at things from the Home Assistant side and found what I was looking for under "automations". This simple script triggers my relay when motion is detected. Obviously, that would be a bad idea for watering a garden but now I understand how to trigger an action based on the state of a sensor.

- id: '1561653332262'
  alias: New Automation
  trigger:
  - entity_id: binary_sensor.relay_motion_105_0
    platform: state
  condition:
  - condition: state
    entity_id: binary_sensor.relay_motion_105_0
    state: 'on'
  action:
  - service: script.1561137758707

Thank you for your assistance!!

[skywatch]

@mrhutchinsonmn Good work! - let us know how it works in the end if you can.

[mfalkvidd]

@mrhutchinsonmn it might be a good deterrent ;-)

[mrhutchinsonmn]

@skywatch What fun!! I figured out how to turn the pump relay on and off, based on the state of the water solenoid relay. This automation.yaml script works :

- id: '1562092064918'
  alias: Relay UP
  trigger:
  - entity_id: switch.relay_4_2
    from: 'off'
    platform: state
    to: 'on'
  condition:
  - condition: state
    entity_id: switch.relay_4_2
    state: 'on'
  - condition: state
    entity_id: switch.relay_2_1
    state: 'off'
  action:
  - alias: ''
    data: {}
    service: switch.turn_on
- id: '1562093186484'
  alias: Relay Down
  trigger:
  - entity_id: switch.relay_4_2
    from: 'on'
    platform: state
    to: 'off'
  condition:
  - condition: state
    entity_id: switch.relay_2_1
    state: 'on'
  action:
  - service: switch.turn_off```

[skywatch]

@mrhutchinsonmn YAY! - What fun indeed! - I am happy that you have made such good progress - now I am sure you'll be thinking of more things you can do ;)

[mrhutchinsonmn]

This script will be more helpful for beginners. The previous script turns on/off all relays. This one controls only the specified relay.

- id: '1562092064918'
  alias: Power Up Relay_2.1
  trigger:
  - entity_id: switch.relay_4_2
    from: 'off'
    platform: state
    to: 'on'
  condition: []
  action:
  - alias: ''
    data:
      entity_id: switch.relay_2_1
    service: switch.turn_on
- id: '1562093186484'
  alias: Power Down Relay_2.1
  trigger:
  - entity_id: switch.relay_4_2
    from: 'on'
    platform: state
    to: 'off'
  condition: []
  action:
  - data:
      entity_id: switch.relay_2_1
    service: switch.turn_off