Smart home consultation new construction wireless

Maybe pull a bus cable to the 2 locations as "preparation"?

Doesn't really make sense if you don't connect the rest to the bus as well.

The PI, well. I’m also burned by that. Back then I had the PI with FHEM and the EQ Max thermostats, plus the 433MHz remote outlets. That was (sorry) garbage. Then the SD card died after half a year and everything was gone. No, never again.

Therefore I try to avoid it as much as possible. Openhab is already "DIY solution" enough. I don’t want to cobble together 5 other interfaces with the PI on top of that.

In an "emergency" it’s just classic wired and I remove the radio components. If the Synology or something crashes I can still operate 95% with switches. That was very important to me (or my wife ).

When I read something like this, I always wonder why DIY solutions are even considered?

When I read something like that, I always wonder why the DIY solutions are even considered?

It was not meant the way you understood and interpreted it.
If something in the entire system doesn’t work, I can still use switches. In an emergency, basically. You can’t do that if you don’t have a switch for the blinds, as suggested a few posts earlier.
If a component fails, I can simply rewire the spot and it keeps running, at least for the time being. In an emergency, basically.

I rather see the PI as a "DIY solution" to control the controlled residential ventilation or similar, and partly also openHAB, yes. Once it’s running, it’s good and stable, but until then you really have to deal with it, especially during the initial setup, and solve one or the other problem.
openHAB is certainly not the Mercedes like KNX, but something between a DIY solution and KNX. Hence the quotation marks...

But to be honest, I haven’t dealt intensively enough with KNX to also be able to:

Doesn’t really make sense if you don’t also connect the rest to the bus.

judge 100% accurately.
With the (prepared) cable and KNX gateway, you could theoretically still integrate it into a central unit of your choice if you need it.

I have already understood it exactly the way you mean. Makeshift solutions rarely have a fallback level. So why bother with them at all, spend money and always have to live with the thought that the system will eventually (most likely completely) fail? Your example with the Pi precisely shows this case and you are by far not the only one with that experience.

With the (prepared) cable and KNX gateway you could theoretically still integrate it into a control center of your choice if you need to.

KNX is only cheap when implemented correctly. Building an island here or there does not get you anywhere because you have to bear all system costs like this.

By the way, KNX and Openhab cannot be compared either because they are located on different layers of the OSI model.

By the way, KNX and Openhab cannot be compared because they are on different layers of the OSI model

Yes, you're right. openHab with Z-Z-Wave or similar would have been more correct.

DIY solutions rarely have a fallback layer

I agree with you on that too, at least not to the extent that you could call it a real fallback layer. For me, the operability of blinds and lighting must always be ensured, that is my fallback layer. This is fulfilled with the Z-Z-Wave actuators.
If the logic/control center, the Z-Z-Wave stick, or the NAS fails. Well, okay, that's unfortunate. But the light/blinds still work.
For me, in a single-family house, it's also okay if the motion sensor no longer turns on the light.
If there is no button, it's already unfortunate if the kids have to sleep in the light.

"For a small amount of money," as it is, it is sufficient. Of course, I would like to have KNX, but I don't want (or maybe can't) afford it.

But even with KNX there are probably single points of failure... power supply for the bus broken, the MDT glass switch breaks, logic server crashes, etc. But as I said, I haven't dealt with it enough.
This is not meant to become a KNX vs.. thread again.

For me, it's also okay in a single-family house if the motion detector no longer turns on the light. If there's no button, it’s already annoying when the kids have to sleep in the light.

Regardless of what is used, there must be a certain concept behind it. There are experience values and proven solutions for this. Automation in single-family houses is by far not such a newfangled phenomenon as, for example, suggested by commercials.

For me, it's also okay in a single-family house if the motion detector no longer turns on the light. If there's no button, it’s already annoying when the kids have to sleep in the light.

If someone has to sleep in the light, it simply means that the given task was only partially fulfilled. Here lies the root of all prejudices against automation in single-family homes. "What do I do if the light no longer turns on by itself, or what do I do if the fingerprint sensor no longer works?" In well-thought-out installations, this is never a problem; there are always at least one or two other options. DIY solutions usually do not belong here. In those cases, "it somehow works," and in case of a defect, the house turns into a pumpkin. Of course, this does not contribute to building trust, and the WAF is often in the basement. And yes, this is not meant to be a KNX vs. thread. Just a remark to explain this to you. The only single point of failure is the power supply. But these are designed with so much reserve that a failure is almost impossible. For example: my main power supply is from 1999 and still runs reliably and without problems. Anyone who wants to be on the safe side or is a bit paranoid can keep a second power supply on the shelf, or even install it directly into the system so that it immediately and almost seamlessly takes over in the event of a failure, as if nothing had happened (like emergency power generators in hospitals, for example). Everything else you listed can safely fail (although also a rather unlikely scenario), typically only resulting in higher-level functions (logics, etc.) and manual operation failing at this point. The basic framework, i.e., lighting, shutters, heating, etc., still works even if servers or touch sensors stop functioning.

I myself use Openhab on a Pi and (so far exclusively) Fibaro Z-Wave actuators... So far everything works perfectly (lights, blinds, irrigation system, outdoor awning, few motion detectors (I'm not a fan)), no failures, no crashes, I have never experienced a signal not arriving, infinitely flexible with a view to the future... can only recommend it. I am truly no IT expert, but I found the whole setup etc. quite easy and quite affordable to implement.

Troubleshooting in case of problems is just simple... Check 1: Is the Pi still running? Check 2: Decentralized actuator ... super easy to find, because it's exactly where it is needed.

Heating and controlled residential ventilation in the smart home... that will not happen with me anyway, because it only costs efficiency without real added value.