Groups > comp.mobile.ipad > #46752 > unrolled thread

what is the ipad telling me when it beeps every second or two under power?

Started by	John Varela <newlamps@verizon.net>
First post	2015-03-22 00:30 -0500
Last post	2015-03-24 08:23 +1100
Articles	15 on this page of 35 — 10 participants

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#46895

From	nospam <nospam@nospam.invalid>
Date	2015-03-23 12:19 -0400
Message-ID	<230320151219188845%nospam@nospam.invalid>
In reply to	#46890

In article
<c3082$551022b2$43da7656$24308@nntpswitch.blueworldhosting.com>, John
Varela <newlamps@verizon.net> wrote:

> > the ipad negotiates with the charger how much power is available and
> > how much it wants. it does that via the two data lines.
> > 
> > snip the two data wires in the usb cable and the negotiation will not
> > work, which means the ipad won't get 2.1 amps. it will only get 100 ma,
> > the initial rate prior to any negotiation.
> 
> Uh oh. Do I understand that you're saying that even though my two-port
> cigarette lighter USB adapter has a port labelled "iPad/2.1Amp", that 
> it's only delivering a paltry 100ma to any iPad that I connect to it?

initially, yes. *all* usb devices start off with 100ma, as per the usb
spec.

the *next* step is to negotiate for additional power, which may or may
not succeed, depending on various factors. 

it's unlikely that a 2a charger will deny a request, but that
possibility does exist.

the negotiation happens over the data wires. if you cut those (which
you would not normally do), the negotiation cannot take place and it
will not go beyond 100ma.

> If so, why would they label the port "iPad/2.1Amp"?

because that's the maximum. 

also keep in mind that most of these chargers are 2.1 amp *total*, not
per port, so if you use more than one port at the same time, you won't
get the full 2.1 amps per device. 

generally, if it doesn't say per port, it isn't. otherwise they'd be
bragging about it being a 4a charger. read the fine print.

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#46933 — Re: what is the ipad telling me when it beeps every second or two under power?

From	John Varela <newlamps@verizon.net>
Date	2015-03-24 02:50 -0500
Subject	Re: what is the ipad telling me when it beeps every second or two under power?
Message-ID	<3e452$55111732$43da7656$16750@nntpswitch.blueworldhosting.com>
In reply to	#46895

On Mon, 23 Mar 2015 12:19:18 -0400, nospam wrote:

> generally, if it doesn't say per port, it isn't. otherwise they'd be
> bragging about it being a 4a charger. read the fine print.

It's a 3.1Amp charger (15 Watts).
It turns out that it's bad.
I tested it more thoroughly today.

So, it must have been doing something funny to the ipad when it was
going bad. But both ports are now dead. So, something went wrong.

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#46939 — Re: what is the ipad telling me when it beeps every second or two under power?

From	Jolly Roger <jollyroger@pobox.com>
Date	2015-03-24 15:17 +0000
Subject	Re: what is the ipad telling me when it beeps every second or two under power?
Message-ID	<cnddgoF8e8sU7@mid.individual.net>
In reply to	#46933

On 2015-03-24, John Varela <newlamps@verizon.net> wrote:
> On Mon, 23 Mar 2015 12:19:18 -0400, nospam wrote:
>
>> generally, if it doesn't say per port, it isn't. otherwise they'd be
>> bragging about it being a 4a charger. read the fine print.
>
> It's a 3.1Amp charger (15 Watts).
> It turns out that it's bad.
> I tested it more thoroughly today.

But you said it wasn't bad!

-- 
E-mail sent to this address may be devoured by my ravenous SPAM filter.
I often ignore posts from Google. Use a real news client instead.

JR

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#46940

From	nospam <nospam@nospam.invalid>
Date	2015-03-24 11:27 -0400
Message-ID	<240320151127547715%nospam@nospam.invalid>
In reply to	#46933

In article
<3e452$55111732$43da7656$16750@nntpswitch.blueworldhosting.com>, John
Varela <newlamps@verizon.net> wrote:

> > generally, if it doesn't say per port, it isn't. otherwise they'd be
> > bragging about it being a 4a charger. read the fine print.
> 
> It's a 3.1Amp charger (15 Watts).

2 amps on one port, 1 amp on the other.

> It turns out that it's bad.
> I tested it more thoroughly today.

no surprise there.

> So, it must have been doing something funny to the ipad when it was
> going bad. But both ports are now dead. So, something went wrong.

it was flickering between supplying power and not, thus the beeping.

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#46929 — Re: what is the ipad telling me when it beeps every second or two under power?

From	Erilar <drache@chibardun.netinvalid>
Date	2015-03-24 00:41 +0000
Subject	Re: what is the ipad telling me when it beeps every second or two under power?
Message-ID	<meqbsm$s55$2@dont-email.me>
In reply to	#46878

nospam <nospam@nospam.invalid> wrote:
> In article
> <866cb$550f9826$7794f5f2$18357@nntpswitch.blueworldhosting.com>, John
> Varela <newlamps@verizon.net> wrote:
> 
>>> only if it negotiates more. it's not automatic.
>> 
>> That's interesting because the cigarette lighter adapter isn't a smart
>> adapter as far as I know.
> 
> it has to be or it won't work.

Maybe the lighter adapter isn't seated as toghtly as you think?  I don't
use that for my iPad because I have a better setup in my car: a normal
wall- type plug- in.
-- 
Erilar, biblioholic medievalist with iPad

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#46874 — Re: what is the ipad telling me when it beeps every second or two under power?

From	John Varela <newlamps@verizon.net>
Date	2015-03-22 23:34 -0500
Subject	Re: what is the ipad telling me when it beeps every second or two under power?
Message-ID	<a6c89$550f97c6$7794f5f2$18357@nntpswitch.blueworldhosting.com>
In reply to	#46829

On Sun, 22 Mar 2015 21:20:15 -0400, nospam wrote:

> both expect 5v.

I know.
There's nothing to indicate that it was otherwise.
But, I was driving, and didn't have a DMM with me, and probably wouldn't
have the right test leads anyway.

I guess I should invest in a custom usb set of test leads, to at least
test the voltage coming out of the cigarette lighter adapter. 

But the thing worked prior, during, and since.

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#46873 — Re: what is the ipad telling me when it beeps every second or two under power?

From	John Varela <newlamps@verizon.net>
Date	2015-03-22 23:32 -0500
Subject	Re: what is the ipad telling me when it beeps every second or two under power?
Message-ID	<7a0ca$550f9775$7794f5f2$18357@nntpswitch.blueworldhosting.com>
In reply to	#46827

On Sun, 22 Mar 2015 21:18:07 -0400, Zaidy036 wrote:

> Is the USB cable long and thin? It could be reducing the voltage into 
> the iPad while still enough for an iPhone.

It's the standard lightning cable, about 3 feet or so.

I think you're on the right tack though, which is that the voltage or
the current wasn't up to par for the ipad.

The beep was not being broadcast to the bluetooth, so it was kind of
a hardware beep (very low volume) coming out of the iPad. 

The only thing that points to power directly was that the battery
symbol flashed from 89% white to 89% green, lighting bolt and then
none, with the beep kind of associated with the flashing.

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#46877

From	nospam <nospam@nospam.invalid>
Date	2015-03-23 00:38 -0400
Message-ID	<230320150038034360%nospam@nospam.invalid>
In reply to	#46873

In article
<7a0ca$550f9775$7794f5f2$18357@nntpswitch.blueworldhosting.com>, John
Varela <newlamps@verizon.net> wrote:


> > Is the USB cable long and thin? It could be reducing the voltage into 
> > the iPad while still enough for an iPhone.
> 
> It's the standard lightning cable, about 3 feet or so.

then it's definitely not a cabling issue.

> I think you're on the right tack though, which is that the voltage or
> the current wasn't up to par for the ipad.

he isn't.

> The beep was not being broadcast to the bluetooth, so it was kind of
> a hardware beep (very low volume) coming out of the iPad. 
> 
> The only thing that points to power directly was that the battery
> symbol flashed from 89% white to 89% green, lighting bolt and then
> none, with the beep kind of associated with the flashing.

that means the ipad is connecting and disconnecting to a charger.

as was noted earlier, you have a faulty cable and/or power source.

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#46880 — Re: what is the ipad telling me when it beeps every second or two under power?

From	John Varela <newlamps@verizon.net>
Date	2015-03-22 23:49 -0500
Subject	Re: what is the ipad telling me when it beeps every second or two under power?
Message-ID	<4433e$550f9b5c$7794f5f2$18357@nntpswitch.blueworldhosting.com>
In reply to	#46877

On Mon, 23 Mar 2015 00:38:03 -0400, nospam wrote:

> as was noted earlier, you have a faulty cable and/or power source.

The power source and cable worked prior, and since, so, they're not
"faulty" in a hardware sense. 

But, maybe the cigarette lighter adaptor was temporarily overheated.
However, I pulled it out and felt it and it wasn't overly hot.

It has an integral fuse, which didn't blow (because it's working now).

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#46884

From	nospam <nospam@nospam.invalid>
Date	2015-03-23 00:56 -0400
Message-ID	<230320150056401394%nospam@nospam.invalid>
In reply to	#46880

In article
<4433e$550f9b5c$7794f5f2$18357@nntpswitch.blueworldhosting.com>, John
Varela <newlamps@verizon.net> wrote:

> > as was noted earlier, you have a faulty cable and/or power source.
> 
> The power source and cable worked prior, and since, so, they're not
> "faulty" in a hardware sense. 

something changed.

it's not normal to repeatedly connect/disconnect.

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#46911 — Re: what is the ipad telling me when it beeps every second or two under power?

From	Lewis <g.kreme@gmail.com.dontsendmecopies>
Date	2015-03-23 19:17 +0000
Subject	Re: what is the ipad telling me when it beeps every second or two under power?
Message-ID	<slrnmh0pnm.16dp.g.kreme@kreme.eternal-september.org>
In reply to	#46873

Okay, so one time? In band camp? John Varela <newlamps@verizon.net> was all, like:
> The only thing that points to power directly was that the battery
> symbol flashed from 89% white to 89% green, lighting bolt and then
> none, with the beep kind of associated with the flashing.

That is the thing that tells you, with 100% certitude, that the supply
of power was the problem.

Either the cable is bad (and yes, a cable can be bad generally and still
work in some devices.. For a while), the connection is bad, the power
plug is bad, the connection to the powerport is bad, or I suppose your
car's battery is bad, though that seems unlikely.

-- 
http://2blog.kreme.com
> I miss the old days. I haven't killed anyone in years.

That's sad.

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#46934 — Re: what is the ipad telling me when it beeps every second or two under power?

From	John Varela <newlamps@verizon.net>
Date	2015-03-24 02:51 -0500
Subject	Re: what is the ipad telling me when it beeps every second or two under power?
Message-ID	<1d059$55111781$43da7656$16750@nntpswitch.blueworldhosting.com>
In reply to	#46911

On Mon, 23 Mar 2015 19:17:24 +0000, Lewis wrote:

> That is the thing that tells you, with 100% certitude, that the supply
> of power was the problem.

It turned out to be the adapter. 
It's fried.
I'm not sure what was happening when the ipad was flashing as the phone
was charging. But the adapter is now totally dead. Both ports.

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#46801 — Re: what is the ipad telling me when it beeps every second or two under power?

From	dorayme <do_ray_me@bigpond.com>
Date	2015-03-23 07:03 +1100
Subject	Re: what is the ipad telling me when it beeps every second or two under power?
Message-ID	<do_ray_me-0A4FEA.07033923032015@aioe.org>
In reply to	#46752

In article 
<91f77$550e5367$43da7656$2395@nntpswitch.blueworldhosting.com>,
 John Varela <newlamps@verizon.net> wrote:

> I was using the ipad in the car plugged into the cigarette lighter when it 
> started beeping every second or two.
> 
> At the same time it was beeping regularly, it would show a green 89% battery 
> and a lightning bolt and then a white 89% battery and no lightning bolt.
> 
> I unplugged it from the car charger, and as I remember it, it stopped 
> beeping.
> I plugged it back in and it started beeping again.
> 
> The bluetooth was on so the audio for the gps was going through the bluetooth 
> speaker.
> The beep wasn't going through bluetooth. It was coming directly from the 
> ipad.
> 
> What is this barely audible beeping trying to tell me?

Does it happen with the engine off?

-- 
dorayme

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#46876 — Re: what is the ipad telling me when it beeps every second or two under power?

From	John Varela <newlamps@verizon.net>
Date	2015-03-22 23:36 -0500
Subject	Re: what is the ipad telling me when it beeps every second or two under power?
Message-ID	<99d8a$550f984c$7794f5f2$18357@nntpswitch.blueworldhosting.com>
In reply to	#46801

On Mon, 23 Mar 2015 07:03:40 +1100, dorayme wrote:

> Does it happen with the engine off?

Good question. 
I didn't test that since I was on a long drive and didn't think of stopping.
What are you getting at?

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#46920 — Re: what is the ipad telling me when it beeps every second or two under power?

From	dorayme <do_ray_me@bigpond.com>
Date	2015-03-24 08:23 +1100
Subject	Re: what is the ipad telling me when it beeps every second or two under power?
Message-ID	<do_ray_me-6C8EB1.08235924032015@aioe.org>
In reply to	#46876

In article 
<99d8a$550f984c$7794f5f2$18357@nntpswitch.blueworldhosting.com>,
 John Varela <newlamps@verizon.net> wrote:

> On Mon, 23 Mar 2015 07:03:40 +1100, dorayme wrote:
> 
> > Does it happen with the engine off?
> 
> Good question. 
> I didn't test that since I was on a long drive and didn't think of stopping.
> What are you getting at?

Just that engines, at least as in my previous cars, would send down 
pulses to interfere with electrical and radio signals, steps had to be 
taken to suppress them. 

But modern cars usually don't do this. It was just a thought to 
eliminate any interference from your engine with the piping of power 
to your iPad. Easily eliminated as a suspect!

-- 
dorayme

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csiph-web

what is the ipad telling me when it beeps every second or two under power?

Contents

#46895

#46933 — Re: what is the ipad telling me when it beeps every second or two under power?

#46939 — Re: what is the ipad telling me when it beeps every second or two under power?

#46940

#46929 — Re: what is the ipad telling me when it beeps every second or two under power?

#46874 — Re: what is the ipad telling me when it beeps every second or two under power?

#46873 — Re: what is the ipad telling me when it beeps every second or two under power?

#46877

#46880 — Re: what is the ipad telling me when it beeps every second or two under power?

#46884

#46911 — Re: what is the ipad telling me when it beeps every second or two under power?

#46934 — Re: what is the ipad telling me when it beeps every second or two under power?

#46801 — Re: what is the ipad telling me when it beeps every second or two under power?

#46876 — Re: what is the ipad telling me when it beeps every second or two under power?

#46920 — Re: what is the ipad telling me when it beeps every second or two under power?