Hello.
I am using the HomematicIP HmIP-MOD-OC8 relais board for my garden watering.
The wiring is:
- Relais 1: pump
- Relais 2: 24V supply for my valves
- Relais 3-6: four different valves / watering circuits
In this setup, I always need to pull the relais 1 and 2 together with one of the other “valve relais”.
I currently have 6 switch buttons on my dashboard and do this manually.
(activate 1 and 2, active 3, deactivate 3, activate 4, …, deactivate 6, deactivate 1 and 2)
How should this be done in Home Assistant in a manner that 1 and 2 are always active automatically with one of the other relais?
Thank you.
Best regards,
Marcus
Ah, sorry. Forgot to mention that I was playing with the automations already:
description: ""
trigger:
- platform: device
type: turned_on
device_id: a7dc976d07499e28f54b97a45f15a761
entity_id: switch.hmip_mod_oc8_000d1d89a09874_ch18
domain: switch
condition:
- condition: device
type: is_off
device_id: a7dc976d07499e28f54b97a45f15a761
entity_id: switch.hmip_mod_oc8_000d1d89a09874_ch10
domain: switch
action:
- type: turn_on
device_id: a7dc976d07499e28f54b97a45f15a761
entity_id: switch.hmip_mod_oc8_000d1d89a09874_ch10
domain: switch
mode: single
This is actually working, but this seems extremely cumbersome when I have to consider all the possible switch on/off combinations.
I assume there is a smarter way to implement this 
Ok, I am making slow progress, but things feel still cumbersome. Is this approach correct or am I over-complicating things?
What I have now done:
- created a helper item of type “counter”
- created four, unconditional automations.
- An activation of any of those valves increments my counter variable
- A deactivation of any the valves decrements the counter
- When counter > 0: activation the other two relais
- When counter < 1: 15s delay and deactivation of the two relais
This is working now, but it really feels wrong.
What do you think?