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Commenters who don't read the article do more harm than good.


I think you meant tuna not salmon. A large tuna can be 100's of kilograms, whereas a large salmon you are lucky if there is 10kg of edible meat


GP was talking about the story from the bible.


And I was comparing salmon farms to cattle feed lots in the USA, not saying “salmon feed many”. Wow that got hilariously off track.


I'm no expert but that seems like it could be very energy intensive. All the systems to maintain water quality, temperature. Not to mention the problems that arise having fish in such high density.

There are other places in the world that farm salmon at a much lower density which helps in terms of disease and bioload on the environment. There's a company in New Zealand attempting to build open ocean fish pens, they might already have a prototype out already can't remember. Different species of salmon though.


Energy may not be so much of an issue here in Quebec, where electricity is USD$0.05/kWh (residential rate) and 99%+ of it comes from hydroelectric power.


In the video David says he's building it just because he wants to. It really sounds like his own passion project. No investors. It's a nice position to be in.

Now I don't know this guy in the slightest. One view could be he's just a geek like us living out his dream building cool potentially useful stuff not entirely sure where it will lead.

A cynical view is it's all about $$$$.

Either way it's great HN content!


I should have made clear, my suspicions are not really around the engineers running this, its the people who are less motivated by the original cause that can see $$$ in it.

Thats the point right, most of us would, if given the chance, divert some funding to work on a passion project that could easily save lives. That I applaud and would love more people to be able to do.


We have no investors, we could pocket the money. We're choosing instead to spend it on projects like this <3


And doesn't bone pretty much block all ultrasound waves? There is a time and place for ultrasound, just like there is for MRI or Xray.

So im curious to know the limitations of this device


I'm just guessing here but similar to a CAT scan, having actuators/probes at all angles could mean you can get an image around such obstacles. skull is probably an exception and it's the reason why we don't see any head scans in any one of the videos.


Also I imagine it pretty difficult to get good data from that because of all the muscles that do stuff if put in water and you would hold your breath.

There is no way people will put up with that.


My thoughts too. But ive had my definition of waste adjusted before - see bitcoin.

If some people see value in it then....


Or even just the ability to export a 2d dxf which is probably simpler to implement.

STL and 3MF are not very compatible with most CAD software.


I've wondered if LLMs are infact conscious as per some underwhelming definition as you mentioned. Just for the brief moment they operate on a prompt. They wake up, they perceive their world through tokens, do a few thinking loops then sleep until the next prompt.

So what? Should we feel bad for spawning them and effectively killing them? I think not.


I did this for an entire cities water supply network. SCADA systems UIs are a decade or more behind the modern web, not to mention slow loading and expensive. I took a reticulation diagram and marked all the flow meters, pressure transducers, pumps, reservoir level sensors and even river flow meters just like you said using ids for each element. The data is essentially pulled from a sql query every minute and pushed out through json including any active alarms.

This lets as many users view it as necessary and loads instantly. Has pan and zoom so yiu can capture everything on a page. Fully customisable, used draw.io for the diagram. Professional automation guys jaws dropped when i told them it took a few days to build and didnt require some ridiculous software license


This vaguely reminds me of when I briefly worked at an oil company as a drafter. All their P&ID's are drawn in AutoCAD .dwg files, which isn't searchable at all or intelligible to the computer. AutoCAD sucks and has a stranglehold on these older "systems" drawings (as opposed to individual mechanical parts). Also, each company has its own different drawing spec and you need to have a lot of domain knowledge to understand a drawing. I had this grand idea that I didn't follow through with of JSON-defined "drawings" that could then be rendered to svg. Maybe a graph data structure would be better to represent the data. This would make them searchable, and LLM-ready so you could ask natural language questions of an entire refinery or pipeline or water treatment plant or chemical plant.

Not quite the same as its not real-time SCADA, but still interesting. It seems like there is big opportunity here for someone who can crack it.


I love hearing stories like this. Hard not to love all the open web tech we can all use for free. Good reminder just how revolutionary it can be.


How do you validate that each elements status is working? That there are no typos or copy/paste errors lurking in there? I guess you can inject test data after the sql query and verify the right elements change.


You can use the browser console to inject any value to any element to verify expected behaviour.

There are also patterns in the water network so issues reveal themselves pretty quick then easy to fix. E.g. pumps on=green, off=grey, fault=red. Easy to spot an element that is misconfigured especially when you look at it all day.

You can also hover over an element and it reveals its tagname in a tooltip which helps. And the script has an error log for things such as if there are any tagnames in the query it can't find a drawing element for or if it failed to set some value


>> You can use the browser console to inject any value to any element to verify expected behaviour.

Thanks! I'm not a web dev, so I'm not familiar with what that console can do or how easy that is. Sounds like fun.


I'd like to learn more about this system! Also, what's on the backend side? How do you collect data from the sensors? Check out my river meteo-station: https://imgur.com/a/agk-RRovIkg


Its a typical utilities SCADA system most cities operate.

Much like your setup their are sensors fitted to various infrastructure connected to PLC's connected to licensed uhf radio modems back to a base station (with a few hops through repeaters or microwave backhaul) into a PC running some kind of IO server which handles all the polling and collects the data into a database and SCADA software (Aveva).

Its a weird mashup of hardware and protocols (dnp3, modbus, serial) plus some data coming in through IoT devices over http and all sorts of bits.

All i built was a python script that runs the query (we are talking 200 bits of data) every minite and dumps it into a JSON file. Then there is a caddy server which serves the json, SVG (1.5mb uncompressed) and a vanilla html/javascript (300 ish lines of code, AI helped get started) page that displays it.

Its not open to public, nor is it a replacement for SCADA (SCADA has many many more objects plus the ability to control and send out alarms). There are many more people wanting 'view only' access than the city has pricey SCADA licenses for, so if fills this gap for free. Sorry i can't share more, i moved on from that job.


Just wanted to say thank very much for sharing this.

Over the last few months I've been inventing this almost exact approach in my head as a hobby without consciously knowing it had already been done. I love their little RC car demo.


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