Could you please expand a little on the setup of a hub/gateway in your project? I found the Arduino sketches for three sensors but it was not clear to me how one would go about the gateway those sensors would connect to.
thanks a lot. I am looking for the longest time to get temperature sensors for the various radiators of our house's heating system (temperature of pipes entering/leaving each radiator plus room temperature, wall temperature). I found no suitable ready-made Zigbee sensors and developing my own seemed like a daunting task. Your setup looks like a very realistic option for my project.
That's a cool use case. You should be able to use several DHT22 sensors per unit without too much trouble. If I were you, I'd consider mounting the unit on the wall near your radiator, then running some flexible 3 wire cable to all your various sensors.
I'd say the strength of my project is that it's fully open source and designed for casual hackers. The code is only a few hundred lines, and the hardware is all cheap commodity stuff.
The downside is that you'll need to get your hands dirty to set it up. But, there's a big upside in that you'll never get locked in to a proprietary service.
every day usage: If you also have a PV system you can decide when to run the dish washer, laundry machine, dryer, ... and how many of these "bursty" appliances can possibly run in parallel w/o consuming energy from the grid
analysis/optimize energy consumption, e.g.:
* we moved the freezer from the kitchen to the basement instead of buying a more energy efficient new one
* the pump in our (20yrs old) heating system constantly uses 60W -> the whole furnace is now due for replacement
* determine your electricity base load in order to make an informed decision about the capacity of a battery system that buffers energy demand during the times the PV system does not supply energy
I'd say the real value is in looking into long term patterns (no ML needed).
@gorgoiler: that's a "classical" pumped storage facility, not the concrete (or stone) piston version proposed here.
According to this press release https://www.stawm.de/energie/strom/speicherung.html, in April last year they were hoping to be able to start building the Weilheim prototype by December. The seal technology was undergoing trials near the Baltic Sea (translating from the press release).
While this sounds interesting, building the "cylinder" and the "piston" to fit exactly at the huge dimensions they are envisioning, and getting the seal to work at these dimensions and in the long term sounds like a pretty big challenge...
The sealing technology is a rolling diaphragm. Rolling diaphragms do not have any sliding action, and as long as the diaphragm is fastened on both sides and not punctured, the seal remains intact, without close clearances. They are used already on valves and pneumatics/hydraulics applications of various sizes.
That muslims were members of the KMT and served in the KMT army means nothing. The KMT was not a muslim organization. It had no religious affiliations at all. It was a chinese nationalist political party.
I don't think I said KMT was a muslim organisation. It was a nationalist organisation, or a warlord organization - the allegiance of generals to the party was often quite nominal.
However, it bears some relevance to the matter that KMT-affiliated troops that fought against Soviet invasion in a predominantly Muslim-populated area were Muslims. I don't see here any particular parallels towards Islamic or Islamist movements today.
The last part of your reply is especially important: East Germany is most likely the blue print of what will happen to the southern portions of the European Union. I am surprized this is not discussed more widely. Deindustrialization with most of the educated young generation moving away. This trend is hard to reverse.
