It's not about isolation though - it's about line noise. An isolation transformer will let that pass straight through (minus the usual filtering due to any transformer being an inductor), whereas the AC->DC->AC conversion gets rid of all of it by effectively acting as a perfect low-pass filter.
I am hoping by the end of the decade smartphones start having pm2.5 and co2 sensors built-in
and then next decade smartwatches
Once EVERYONE starts seeing air-quality on their phones every hour of the day everywhere they are, they will start to care and then eventually, maybe do something about the politics to improve air-quality
Imagine the game-changer if air-quality was in the next iPhone
They already make sensors that can go on a keyring so inside a phone is not implausible within a few years
I doubt it, maybe in rich countries where the air is already pretty good. There are enough places out there (mine included) where you can see and feel air pollution without using any sensors: limited visibility on the order of a few dozen meters, smell of burning coal and rubber tires in the air, windows blackened by soot. Everybody knows how terrible the air is, talks about it daily, and can't actually do anything about it.
I've been advocating for closed windows and increased use of air purifiers and FFP3/N99 respirators, and had some limited success among people I know. People are often easily convinced once they see the state of their filter or respirator after a few days of use.
Yeah it’d be cool if the phones had sensors. Everyone can see local AQI already though; weather app has AQI, and you can tap on it for a local region map, as well as a table of pollutant details.
the "local AQI" is usually from a single government sensor for 100 mile radius which is useless as pollution is highly localized (think neighbor idiots burning leaves all day)
also doesn't tell you indoor air quality which where you sleep REALLY matters if the co2 is sky high
best third party AQI network is PurpleAIR but even with them certain cities have few or none
US doesn't even have mandatory air-quality sensors at airports, which it should because that's where most of the other weather measurements are coming from on most apps, even if you are 30-50 miles away
> the “local AQI” is usually from a single government sensor for 100 mile radius
What’s your source on this? IPhone’s AQI report says it’s from Breezometer, which links to Google’s Enterprise AQI offerings, which claim 500m resolution and multiple sources (“over 70 local indexes”). I don’t know but would speculate that Purple Air might be one of the licensed sources.
Even if measurement was perfect, people would have incentive to ignore it. Who wants to be told they can't do something, based on some claim that it might be bad for them in the very long term? People still smoke cigarettes and drink alcohol despite those being known to be bad for decades.
Air pollution, like numerous other things like water quality and medical care, is too big to be made into a individual decision.
1000+ years from now a ship will take off from earth or orbit and pass Voyager in a few hours (assuming the planet is not turned into one huge radioactive, forever-checmical ocean before then)
if taking on a brand name might incur lawsuits there are other watches like the wahoo rival which was completely retired and they got out of the business (it was only $99 too)
or there are other ppen hardware options from China
But what I REALLY remember is learning that H class motors existed and became obsessed with finding one but the internet wasn't a thing yet so it was impossible
Yeah, the letters go up by powers of two. So an H would be eight Es, sixteen Ds. Considering the cost of a three pack of the latter, I could only dream of those brutes.
Same here. Even the small motors were expensive at the time. One winter my dad and I figured out how to make our own—rolled the casing out of packing tape, poured the end plug from (I think) Durham‘s rock-hard water putty, then filled with fuel made from a mixture of black powder, sugar, and salt peter. The next summer, getting to use up all the engines we’d stockpiled, was glorious.
I had (maybe still have somewhere?) a book I'd ordered online as a youth, on how to do exactly that. They were somewhat fiddly, in the sense of being slightly lower-impulse, with clay nozzles and a hollow fuel grain. Never quite got around to making any. I should look for that book though. In any case, it's likely harder than it used to be to get saltpeter, which they just carried in the pharmacy.
whenever I need a crash-course on a vitamin or mineral I check the Linus Pauling Institute at Oregon State University for quality info written by and reviewed by Phds
camera the size of a grain of rice with 320x320 resolution
https://ams-osram.com/products/sensor-solutions/cmos-image-s...
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