[-] Starfighter@discuss.tchncs.de 11 points 5 days ago* (last edited 5 days ago)

Solar freakin ~~road~~ railways

Naja immerhin fahren sie nicht auf den Paneelen.

[-] Starfighter@discuss.tchncs.de 11 points 1 month ago* (last edited 1 month ago)

For some people logging out and back in has helped but I've seen multiple beehaw users state that this doesn't work for them.

This seems to be because beehaw is intentionally staying on an old Lemmy version.

Not sure how the Dev wants to handle this since they've got enough work on their hands and this issue should resolve itself once beehaw upgrades.

For now your best bet is to try re-logging and if that doesn't work to roll back to a previous version of Eternity.

[-] Starfighter@discuss.tchncs.de 20 points 3 months ago

Always mocking Dr. Daniel Jackson. Poor guy

[-] Starfighter@discuss.tchncs.de 14 points 5 months ago* (last edited 5 months ago)

Und an dem Punkt könnte man die Routen und Fahrzeiten dieser Fahrzeugverbände zentral steuern, damit sie immer grüne Welle haben.

Dieses Werk könnte man zB ein Stell-Center nennen.

[-] Starfighter@discuss.tchncs.de 17 points 5 months ago* (last edited 5 months ago)

I could only find the Model 3 in their statistic.

  • Year of registration: Breakdowns per 1000 vehicles
  • 2021: 1.0
  • 2020: 1.3
  • 2019: 4.0

The best value for 2021 is 0.8 by the Audi A4 and A5, whilst the worst is the Toyota RAV4 with 17.6.

Overall they rank the Model 3 with "very low" and "low" rate of failure.

Granted these cars are still pretty young so who knows what that figure will look like in 5 or 10 years.

[-] Starfighter@discuss.tchncs.de 23 points 6 months ago* (last edited 6 months ago)

Dr. med. Maurice Cabanis (einer der Experten) ist schon ein bisschen sus

[-] Starfighter@discuss.tchncs.de 16 points 7 months ago

Dann lieber auf das Kreuz:

Auch Mischformen, bei denen die Wurst anstelle von Jesus direkt ans Kreuz genagelt wird oder bei denen zwei gekreuzte Würste ein Kruzifix (sog. Wurstifix) bilden, sind erlaubt.

[-] Starfighter@discuss.tchncs.de 18 points 7 months ago* (last edited 7 months ago)

Out of curiosity I've let it rate Low<-Tech Magazine, a website run on an ARM SBC powered exclusively with off-grid solar power, and that only achieves 87% / A.

Link to results

[-] Starfighter@discuss.tchncs.de 13 points 8 months ago* (last edited 8 months ago)

This is effectively what a thermostat does.

The problem is that the controller won't know how well insulated each room is, how cold it is outside (including wind speed), which doors and windows are open and when, what people or devices are doing in each room.

The way thermostats solve this is by creating a closed loop where they react to how the room reacts to their actions.

Depending on how your heaters work you'll likely need some dynamic component to react to these unforeseen changes unless you can live with the temperature being very unstable.

To get a rough idea of how long the heaters will have to run you can look at each room in for the last n days and see if the heater's runtime was long enough to (on average) hold your target temperature. Dividing the average temperature with the target temperature will give you an idea whether they were on for too long or too short. (If the heaters have thermostats you'll likely need to subtract a small amount from that value so that it will settle at the minimum required heating time)

If that value is close to 1.0 you know that on those days the heating time was just about perfect.

Once that is the case you can take the previous days heating time and divide it up over the cheapest hours. The smaller of a value n you choose the more reactive the system will be but it will also get a little more unstable. Depending on your house and climate this system described here might simply be unsuitable for you because it takes too long to react to changes.

There are many other ways to approach this very interesting problem. You could for example try to create a more accurate model incorporating weather and other data with machine learning. That way it could even do rudimentary forecasting.

[-] Starfighter@discuss.tchncs.de 11 points 8 months ago

Are there any implementations of this out there or is this purely theoretical (at this point in time)?

[-] Starfighter@discuss.tchncs.de 50 points 8 months ago* (last edited 8 months ago)
21
submitted 1 year ago* (last edited 1 year ago) by Starfighter@discuss.tchncs.de to c/askelectronics@discuss.tchncs.de

Hi, this post is structured similarly to r/PrintedCircuitBoard 's review request format. Since we don't have any PCB communities over here yet, I thought that this might fit in here and can maybe spark some friendly discussion.

This is a relay board controlling electrically driven windows and blinds. For this purpose it has some additional connectors to a weather station, interior sensors and an LCD screen.

It is replacing a ~20 year old board that has started to develop some annoying quirks. I've mostly copied what the original board did and adjusted it for the ESP32. This is not a production board and if all goes well, I will only ever assemble a single one of these.

The primary usage scenario is that the MCU will monitor the weather station and then actuate the motor groups (M1 - M6 connected on J3 - J8) to keep the indoors temperature and humidity in check.

At least during summer time the board will likely run 24/7 and will hopefully be used for a number of years. For maintenance reasons I've tried to keep it simple and the component count low.

Mains power is supplied from J1 and being fed to the motors via the relays. PS1 converts the line voltage to +5V DC for the relay coils and some auxiliary components. The switching regulator U2 steps that down to +3.3V for the MCU U1 and IO Expander U3.

The board size is mostly constrained by the preexisting mounting holes which gives me plenty of space to work with even with just a 2 layer board. The enclosure containing the mounts is installed indoors and is finger-pokey-tight.

Jumper JP1 allows me to supply the MCU devkit daughter board with +5V, should I ever replace it with a different one. Similarly J11 exists for future expansion.

J10 mounts another daughter board (not included in review) facilitating communications with the weather station. Should the station ever need to be replaced I can swap in a new, matching board.

There aren't any high-speed connections on the board. The fastest one is likely the SPI connection to the LCD controller but I can slow it down in firmware if necessary.

Regarding the DNP components: There are only 5 motors installed at the moment so I will cover the sixth slot with a piece of plastic for now. R1 and R2 will only be populated if the 10k pullup resistors integrated into the MCU are insufficient for typical baud rates.

While it is not the first board I've designed, it is the first one carrying mains power (European grid 230V@50Hz). I'm using 2 oz copper to accommodate the motor currents within reasonably wide traces.

In case anyone is interested, it will be running the ESPHome firmware to easily integrate with the Home-Assistant smart home solution. This also pushes firmware maintenance from me onto the ESPHome devs.

3D render from front (no 3D model for relays K** and MCU board; 3D model for J1 and J2 is a stand-in of same outer dimensions): 3D Front

Orthographic view from front: Orthographic Front

Schematic:

Schematic

PCB All layers (For reference: thickest traces are 2.5 mm / ~98.4 mils; thinnest traces are 0.25 mm / ~9.84 mils): All layers

PCB Front layers excluding Silkscreen: Front layers

PCB Back layers + Front Fab layer: Back layers

[-] Starfighter@discuss.tchncs.de 14 points 1 year ago* (last edited 1 year ago)

The "add to home screen" button turns into an "install" button when Firefox detects that the website is a progressive web app (PWA). Other browsers do the same.

The difference is that a PWA can define a custom icon and name for the "app" button on your home screen and that it can use some clever caching making many PWAs offline capable (meaning you don't need an internet connection to open the web page).

I understand the reluctance to press "install" but in the case of PWAs the install size is tiny and fully contained in Firefox and you get the added benefit of faster startup / loading times due to caching.

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Starfighter

joined 1 year ago