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Rotary Cellphone

justine-haupt.com

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Re: Rotary Cellphone

#131

Post by dwild »

taneq wrote: post #41
JdeBP wrote: post #38

Earlier quoted context omitted.

The headlined article states that it was taken from 2 hours to 1 day already.

Yeah, but that's from "first somewhat functional prototype" which probably didn't make any special effort to conserve power, to "rev A" which I'd guess does all the obvious things and is all you're going to get without significant effort. You don't get "several weeks" out of a phone without some wizardry or a humungous battery.

On my first Android smartphone, an LG Optimus One P500, I had no trouble to reach 4-5 days and the battery was far from humungous, only 1500 mAh. Most things were not running but I was using it to text quite often during the day. I don't believe there was any wizardry on there.

We see the battery on a picture, if it comes from Adafruit, that seems like the 2500mAh one they sell. There's no reasons that thing can't last at least a week, but I can understands it wasn't the goal at all to make it last, so almost no effort was invested in that.

Re: Rotary Cellphone

#132

Post by klyrs »

DonHopkins wrote: post #60
Waterluvian wrote: post #58

Earlier quoted context omitted.

Not being able to slam hang up on someone is a critically missing feature and due to such, I believe the entire smartphone revolution is a failure.

The biggest problem with telephones that still persists even today, is that you can only hang up on somebody once. Anybody who can solve that problem is bound to revolutionize communication as we know it.

Just call 'em back and do it again!

Re: Rotary Cellphone

#133

Post by LadyCailin »

iNate2000 wrote: post #130
XaspR8d wrote: post #86

Earlier quoted context omitted.

That would foil me if it was my only memory device. A+B=C is true of ~55 (napkin math) different 3-digit numbers. Plus another 40-ish for A×B=C and 50-ish for A-B=C...

But it’s A+A=B

The good news is, there’s not that many of those. 112, 224, 336, 448, 550 (its a stretch), and you’re likely to start at the beginning, therefore getting it on the first try.

Actually, I’ve heard that on cell phones in EU, you can still dial 911, and it’ll connect. I have had occasions to call 112 before, but it’s always been in big enough emergencies that I didn’t have time to experiment. I’m eagerly awaiting the day when I come across an emergency that’s urgent enough to call 112, but not urgent enough that it can’t wait a little bit for me to try something. It’s a delicate balance

Re: Rotary Cellphone

#134

Post by RandomGuyDTB »

iNate2000 wrote: post #130
XaspR8d wrote: post #86

Earlier quoted context omitted.

That would foil me if it was my only memory device. A+B=C is true of ~55 (napkin math) different 3-digit numbers. Plus another 40-ish for A×B=C and 50-ish for A-B=C...

But it’s A+A=B

(assuming it's A + A = B, there are still 4 sequences that could be if every number is an integer between 0 and 9, but if they remembered one of the numbers was a 1 it would drop the possibilities down to only 1 + 1 = 2)

Re: Rotary Cellphone

#135

Post by timonoko »

ranit wrote: post #121
timonoko wrote: post #62

European Union recommended emergency number is "112". Because you can morse it with the hook or even by short-circuitin the wires. This is also why the pulse-dialing receiver is operational in most EU countries.

Thanks for the information. I didn't know. A nitpick: this is not "morse" [code].

Yes it is. Spells "EEI". Cry for help or "expression of disapproval” in Chinese.

Re: Rotary Cellphone

#138

Post by wolfpwner »

drcongo wrote: post #129

I don't understand how one would dial a 1 on that dial. There doesn't seem to be any room for it to travel.

I'm thinking of the same thing, looking at the pictures of old phones, there should be space reserved between the "1" hole and the metal stopper.

Re: Rotary Cellphone

#139

Post by eigenvector »

LadyCailin wrote: post #133
iNate2000 wrote: post #130

Earlier quoted context omitted.

But it’s A+A=B

The good news is, there’s not that many of those. 112, 224, 336, 448, 550 (its a stretch), and you’re likely to start at the beginning, therefore getting it on the first try. Actually, I’ve heard that on cell phones in EU, you can still dial 911, and it’ll connect. I have had occasions to call 112 before, but it’s always been in big enough emergencies that I didn’t have time to experiment. I’m eagerly awaiting the da…

In another recent HN thread, someone posted that due to the way emergency dialing is implemented in the cellular stack, dialing "911" will dial the local emergency number because "911", "112", etc. aren't treated as actual phone numbers, they just trigger the cellular network to bypass normal dialing sequence and connect you to the local emergency system.

Re: Rotary Cellphone

#140

Post by [deleted] »

spookthesunset wrote: post #103
TheRealPomax wrote: post #97

Earlier quoted context omitted.

It's almost as if Europe is not a country. Just like the US, every country in has its own emergency numbers that you should probably know if you're in that country, but for Europe as a whole, 112 is the universal emergency number. And while 911 might be known to many outside the US, as a number that requires actually navigating the dialing pad, it's not all that great. The UK's 999 or Europe's 112 are far better at b…

It is a trade off though. I’m sure “911” is no accident either. Because it is slightly harder to dial, it probably has far less accidental dialings than some other countries emergency numbers. I bet little kids would constantly pick up a phone and dial “999999999”.... harder to mistakenly / playfully dial “911”

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