How to add a "Max Thermostat"?

[jensliebau]

Hi,

has one of you already added a "MAX! Heizkörperthermostat+" to homebridge-openhab2-complete?

Unfortunately I do not understand how to map the channel/items to homebridge config. :-(

Current state:

• The Thermostat is working nicely within openhab2

The Thermostat has following channels:

• Valve Position (Number)
• Low Battery (Switch)
• Mode (String) // can be "auto", "manual", "boost", "holiday")
• Current Temperature (Number:Temperature)
• Setpoint Temperature (Number:Temperature)
• Thermostat Locked (Contact) // you can disable manual modification of settings on the hardwaredevice

Note:

• The Thermostat is attached to a heater element.
• There is a central boiler that heats a heating circuit.
• There is NO on/off switch on the Thermostat. But you can close and open the valve (0% to 100%) by selecting a Setpoint Temperature.
• There is a button on the Thermostat that you can use to switch from auto to manual mode (auto has some preset heating curve)
• There is no option to cool the room with this device.

From the docs I assume this is the minimal necessary config for a "thermostat". Unfortunately there are two Items i don't know how to connect (heatingItem , modeItem)

{
    "name": "Livingroom Thermostat",
    "type": "thermostat",
    "currentTempItem": "Itemname-within-OpenHAB",    <- connected to Current Temperature  (Number:Temperature)
    "targetTempItem": "Itemname-within-OpenHAB",     <- connected to Setpoint Temperature (Number:Temperature)
    "heatingItem": "Itemname-within-OpenHAB",        <- what shoud I connect here?
    "tempUnit": "Celsius",
    "modeItem": "Itemname-within-OpenHAB",           <- how can I convert Channels-Mode to this ?
    "minTemp": "0",
    "maxTemp": "30",
    "minStep": "0.5"
}

I would be happy to receive advice on the solution

[steilerDev]

Hi @jensliebau,

modeItem is not relevant in your use-case, this is only to expose modes of operation (Heating, Cooling, Auto), therefore I would omit it.

heatingItem is the item, showing if your heater is currently heating the room or not. I would create a virtual item in openHab that changes based on your Valve Position. Something along the lines of this:

default.items
Contact HeatingItem

default.rules
rule "heatingItem"
when
    Item <ValvePosition> changed
then
    if(triggeringItem.state > 0) {
        HeatingItem.postUpdate(OPEN);
    } else {
        HeatingItem.postUpdate(CLOSED);
    }
end

I hope this helps, otherwise feel free to re-open.

[jensliebau]

After adding virtual "HeatingItem" and omitting "modeItem" the thermostat does show in Home.app. Thanks a lot!

I do have some additional questions.

Max temperature

I've set

"minTemp": "0",
"maxTemp": "30",
"minStep": "0.5"

What happens: Nevertheless I can select temperatures up to 35° C in Home.app. Every Value above 30.0 results in the thermostat showing "OFF" which is a equivalent of "0.0". Steps are 1.0 not 0.5

Is maxTemp working as expected?

Mode Is ist possible to hide "Cooling" in Home.app? Cause the device cant't be used to cool the cool?