ᐅ Just a few sensors, readable via the internet? DIY?

Smart home, home automation – this is not a priority for the house to be built. However, since the house will not be continuously occupied during the first few years, the idea arose that it could be useful to remotely check some data at any time via the internet: temperature and humidity. Out of curiosity and possibly to be able to send someone to ventilate the house.

So something very simple. Maybe even a DIY solution, as the common all-in-one systems seem oversized to me.

After days of research, I have reached a point where I have read about many components but still lack an overall understanding.

There will be a Fritzbox router in the house and, next to it, a NAS (Synology). One of the usual systems—FHEM, OpenHAB, or ioBroker—could run on the NAS. This could provide external access to the data.

I have also read about using Arduinos and/or DHT22 sensors, which could measure temperature and humidity for me.

How do the measured values get to the NAS? What else is needed in between?

Network cables? Power over Ethernet (PoE) – could the sensor be powered this way without a separate power supply? (Okay, that’s a question for the Arduino forum.)

Does all this fit together somehow? Or won’t I get anywhere this way and need something completely different?

Best regards, Jens

1,2,3 NEST thermostats (or other comparable models) and everything you described would be resolved. No extensive knowledge required and fairly reliable.

You can also achieve this with Netatmo as a non-permanently installed system for a low cost.

Or Homematic. The Raspberry Pi CCU + wireless wall thermostats (temperature + humidity) in the desired rooms.