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Discussion (50 Comments)Read Original on HackerNews
Also not the most unusual thing I've seen over a RJ11, which includes keyboards, RS-232, other random digital IO and full USB with data. But these are normally on items that are not phones.
It would... if you're willing to just let the thing draw up to 0.1W all the time, and fail catastrophically if anything goes wrong with the zener or the supply is more capable than you anticipated (i.e. you plugged into a PoE jack by accident). This is a very bad idea.
We still have a landline. It's part of the cable package, but it mostly just gets robocalls.
Others using this same enormous, American ISP probably have similarly-equipped gear.
But I must admit that it has also been a very long time since I connected anything there. I don't know if they supply 48v talk battery or not when the modem has a data-only configuration.
I am not normal.
The regular phone calls I normally make on my cell still all sound like they are underwater for some reason, except for those rare times when the better connection is actually working.
The Secret Life of Machines TV show has a fun demo of how the speakers in old telephones produce sound https://youtu.be/MCgCSMq5Xpo?si=CT5aOGttBpPk9tEM&t=458
How can that be if the speakers in phones ubiquitously were so bad?
Prior to that, uncompressed or compressed once calls weren't so bad on bad speakers.
https://liionwholesale.com/collections/batteries/products/pr...
By its nature, MUAVs tend to push batteries to their limits and lifecycles tend to be limited. A battery that does mission X must have a maximum weight and a minimum capacity, and a minimum current spec. If you increase the life cycles, you decrease the maximum performance (range, payload, etc).
When you get into bigger drones, more modest restrictions on mission capability give acceptable tradeoffs, but for MUAVs short cycle life is often seen as an acceptable cost.
Frequently , after a hundred (or often much less) cycles in a MUAV a battery is retired from stressful missions due to significant drops in capability. It’s still fine for other uses, but at 90% it’s no longer sufficient for frontier MUAV applications.
The best choice to keep drones from falling out of the sky is to make sure that your auto land is set to a reasonable battery level (calibration by height if you will be at altitude) and use cell cutoffs at or below the minimum safe voltage if at all. (They are usually set to a few tenths of a volt above the minimum safe, often as much as 500mV.) The final battery voltage should be managed manually and batteries tested if over-discharged.
At least, that’s what prevents the most hardware from falling out of the sky onto people’s heads, sometimes bursting into flame on impact. Usually that is seen as the least desirable outcomes of a battery stress situation.
If we're talking about something that's designed to be re-used then a totally different set of design considerations, as you outline above, become applicable.
> Frequently , after a hundred (or often much less) cycles in a MUAV a battery is retired from stressful missions
Are you talking about lipo pouch cells or li-ion cylindrical? Because if we're talking about state of the art high amp draw rated li ion cylindrical cells, 100 cycles on something that isn't heavily abused for heat and doesn't go below 15% state of charge should not significantly affect its lifespan. But if the batteries are being abused or every last bit of margin on range/payload is needed that it calls for almost "factory fresh" cells, or there's just absurd amounts of DoD money to throw at buying new battery packs, sure, I guess.
I got this article conflated with another I was reading. My apologies to all.
I got this article conflated with another I was reading. My apologies to all.
Still, if you don’t want your phone to fall out of the sky, Put it on a drone with proper battery limit discipline.
I got this article conflated with another I was reading. My apologies to all.
It's definitely too easy to put off publishing until it's "properly" done and then it never happens.
An uglier way to do it is with an off the shelf pulse to tone box and a router with VoIP support, like an N300.
Do you think it could use WiFi calling? I suspect that can't be done is it requires one of a limited set of carrier approved phones in each area.
Have a bot do the rest, exactly like a telephone operator.
"Ring ring! Hello? Hey Siri, what's the weather and call my ex so I can hang up on them!"
https://youtu.be/nibV_idJjlg
https://www.ebay.com.au/itm/305557776577