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Working From Home - Impacts of Coronavirus
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SilverSolder:

--- Quote from: SiliconWizard on April 26, 2020, 10:23:55 pm ---
--- Quote from: SilverSolder on April 26, 2020, 10:17:26 pm ---I get about 3 days life out of an old Galaxy S5 here (modded with a bigger battery).  Bluetooth does shorten that down a bit, but I haven't measured the effects.

--- End quote ---

Yeah, any modern Bluetooth chipset will not draw too much power on 'idle'.

But in this case, if you're frequently in areas with many people, Bluetooth communication will happen frequently and draw significantly more, even though it's apparently using BLE, so that's just unfrequent and small packets.

But between BLE and the required OS, that suggests the app will require minimal hardware & OS version to run - which is likely to further limit the % of people with an adequate smartphone.

--- End quote ---

Is it actually possible to enable BLE separately from classic Bluetooth?  -  if not, maybe it is the classic part that is draining the battery, always listening for new devices coming in range etc.
SiliconWizard:

--- Quote from: SilverSolder on April 26, 2020, 10:27:05 pm ---
--- Quote from: SiliconWizard on April 26, 2020, 10:23:55 pm ---
--- Quote from: SilverSolder on April 26, 2020, 10:17:26 pm ---I get about 3 days life out of an old Galaxy S5 here (modded with a bigger battery).  Bluetooth does shorten that down a bit, but I haven't measured the effects.

--- End quote ---

Yeah, any modern Bluetooth chipset will not draw too much power on 'idle'.

But in this case, if you're frequently in areas with many people, Bluetooth communication will happen frequently and draw significantly more, even though it's apparently using BLE, so that's just unfrequent and small packets.

But between BLE and the required OS, that suggests the app will require minimal hardware & OS version to run - which is likely to further limit the % of people with an adequate smartphone.

--- End quote ---

Is it actually possible to enable BLE separately from classic Bluetooth?

--- End quote ---

I don't think so. Never seen a smartphone on which you could.
coppice:

--- Quote from: james_s on April 26, 2020, 09:45:55 pm ---You're very much in the minority, likely less than 0.001% of the population. The number of people who don't own a smartphone is statistically irrelevant, there's no need to develop a standalone device. If you really wanted to volunteer, I'm sure someone would give you an old smartphone that could be used strictly for the tracking app if that was the desire.

--- End quote ---
Have you considered the large number of mostly older people who don't use a smartphone, because they struggle to read them? There are still phone models with big chunky keys and large digits on the display for people with poor sight that sell in considerable quantities. Those older people are a key demographic that most needs monitoring.
Someone:

--- Quote from: SiliconWizard on April 26, 2020, 08:58:19 pm ---Another question: how can the app know who is infected? I suppose it entirely relies on each invidual voluntarily declaring this through the app? How reliable would that be really, knowing we are definitely not nearly as obedient/compliant as korean or chinese people?
--- End quote ---
This is one of the reasons local governments/health authorities want more control over any tracing system, so they can have some control over what is marked for tracing.

But that level of control/inspection is only needed for the database of "confirmed" cases. The google/apple model provides the other 90% of the work, but they require the users to have control over when/if they release any data, and what they do with the information. The big picture view of most of these systems:

a) People walk around and share randomly generated identifier numbers with others near them (how often each persons random identifier number changes is a big privacy question)

b) Each device keeps its personal database of which identifiers it has seen (if you include when/where metadata as well then privacy people get unhappy)

the next step is where this all diverges:

c) Government mandates all data is delivered to them for offical uses, and they have the de-identifying data to link any record back to specific people. They promise this is better as they will actively contact and follow up with people who might be infected.
or
c) Users decide if/when they announce they were infected, and upload the history of their recent identifiers to a central store (could be region/locale specific). Other users periodically pull the official list of confirmed identifiers and check if they have recoded contacts in their local data. This relies on the users deciding on what they want to do with the information, some people might not announce they were infected, and others might take no action even if they had a contact match.

james_s:

--- Quote from: coppice on April 26, 2020, 10:36:18 pm ---Have you considered the large number of mostly older people who don't use a smartphone, because they struggle to read them? There are still phone models with big chunky keys and large digits on the display for people with poor sight that sell in considerable quantities. Those older people are a key demographic that most needs monitoring.

--- End quote ---

I don't know these older people.

As I already said, my parents are in their 70s, I have older relatives in their 80s, my partner's grandparents are late 80s-early 90s, a group of their friends we get together with now and then, all of them have smartphones. I genuinely cannot think of anyone I I know, of any age over about 8 who doesn't have one. Smartphones have high contrast settings, zoom and other features specifically for people with poor eyesight and other disabilities.

Obviously there are a lot more out there than I realized, I just don't personally know any of them and have never seen them so I have to guess it's more common somewhere else.
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