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[Q] Nexus 5 pressure sensor accuracy (barometer)

Hi!
on my nexus 5 (android 4.4.2 stock) the pressure sensor is not accurate.
It detects about 5 millibar above the real value.
I compared nexus 5 with two professional weather stations and with a galaxy nexus: the two weather stations and the galaxy nexus detect about the same value, while nexus 5 detects a too high value (about 5 millibar more).
Has anyone noticed the same problem?
Thank you.

Guybrush85 said:
Hi!
on my nexus 5 (android 4.4.2 stock) the pressure sensor is not accurate.
It detects about 5 millibar above the real value.
I compared nexus 5 with two professional weather stations and with a galaxy nexus: the two weather stations and the galaxy nexus detect about the same value, while nexus 5 detects a too high value (about 5 millibar more).
Has anyone noticed the same problem?
Thank you.
Click to expand...
Click to collapse
Dear Guybrush85,
I guess I have the same issue. I bought mine two days ago and its serial number begins with 401K. I have the latest updates with Android 4.2.2.
My device is measuring with aproximately 1hPa more. I have to admit that calculation (or finding) a real absolute pressure reference is quite hard. Atmospheric phenomena is very complex and local conditions can make noticable differences wrt say, airport weather systems. Knowing your exact altitude is another story if your are dealing with absolute accuracies of less than 5m.
I made a quick test by measuring its relative measurement capability (by walking down to local sea shore and then climb back to home) and I found it comparable with the data given in the datasheet. I have also made several ladder climbing with consistent and repeatable results. For my case, the issue seems to be a simple pressure bias (~+1hPa) and its seems that this bias is constant, i.e., not changing with pressure and temperature (not a rigorous result!).
The sensor used in the device is a Bosch BMP280. Its datasheet indicates that the absolute accuracy of this device is ~+-1hPa. Once I read a datasheet of a similar device (BMP085) saying that soldering process may differ the absolute measurement by 1hPa but of course it is impossible to blame manufacturing process without any further knowledge for such a high difference (your 5hPa).
If it's simply a bias issue then adding/subtracting the bias amount from the reading may be a (ugly) solution. You may also design some experiments (if not since) to find whether your readings are measurement bias or something else.
I may call myself quite obsessive with sensor measurements and I am trying convince myself to live with this if it may not be solved with a SW update. I am not sure if this is a generally known issue with LG Nexus 5.
If you find any solution to this please let me know.
Best Regards,
R. Mert Ozel

If it's a bias issue, an xposed module could fix it to show the correct value. Ugly hack though.
Sent from my Nexus 7

Guybrush85 said:
Hi!
on my nexus 5 (android 4.4.2 stock) the pressure sensor is not accurate.
It detects about 5 millibar above the real value.
I compared nexus 5 with two professional weather stations and with a galaxy nexus: the two weather stations and the galaxy nexus detect about the same value, while nexus 5 detects a too high value (about 5 millibar more).
Has anyone noticed the same problem?
Thank you.
Click to expand...
Click to collapse
I bought a Nexus 5 last month. Similar issue, but mine the bias is +2mbar.
I've been plotting the pressure trend using my N5 and N4. I use this simple app Barometer. After nearly a week, the pressure trend IS similar. Indicating that my N5 have a bias of +2mbar.
Any idea how to correct this bias?
Cheers

THIS ANDROID PHONE: Why won't ANY manufacturer make it???

A decade ago to yesterday, there's been so many developments in mobile technology....we used to see a release of 1 or 2 types of phones to suit certain markets/demographics. Now; rather than seeing this, it's generally unheard of, or extremely uncommon for a big manufacturer to release fewer than 6-10 different types of phones in a calendar year. So my question is this; with the market so heavily flooded with competition of making and selling the best smartphone and so much more variety and pricepoints to choose from, WHY in the BLUE hell can 1 manufacturer NOT make this?? ---
These are of course, my personal preferences and some features or functions I'm sure m,any of you can live without. But that's my point; these features/functions are NOT big changes or improvements, so living without is really not acceptable when all of these can be made and found on ONE device:
Screen/body size and type - Just give me something that looks vibrant, accurate AND is comfortable to operate in ONE hand
Not only that, just let it fit easily in and out of my pocket!
The trend has been pretty obvious - smart phones and screens are getting bigger! As a result over the last 5-6 years, screen sizes have become ridiculously large and now phablets are a 'thing'.
5" is probably the ideal screen size. The dimensions of my Huawei P10+ seem rather acceptable for me, at: 153.5 x 74.2 x 7 mm (6.04 x 2.92 x 0.28 in)
We should be championing better technology of 2K AMOLED or OLED screens and not falling back to cost cutting with crappy 720/1080p FHD TFT LCD types
LED Notification Light - I care about notifications without having to pick up[ my phone to check it!
Just give me something where I have control over the colour/intensity and frequency and stop locking these features away.
The LED notification light has shrunk from a large vibrant size to the pin-head size we can barely make out on phones that currently adopt it.
I'm in Australia and care about fast download speeds; so until 5G is here, give me band 28 - 700Mhz
My carrier and most phones support the 4G network, or Telstra's '4GX'. So I need a phone with the capability and to not offer it (or lock certain bands down) is preposterous.
DUAL SIM popularity is increasing and I want this capability for personal AND work purposes!
Dual-active! Not dual standy-by; because 2G is switched off in my country. Give me 3G/4G dual or 4G/4G with the abilty to switch off data (for 1 SIM) if I don't need or want it.
I have friends carrying 2 phones and one carrying 3 phones around, which IMO is utterly pointless. One truly 'smart' phone will do, thanks.
Technological advancements allow it, so why not make it? TWO sim slots with the microSD card that --DOES NOT-- take up a SIM slot: #separateslot
Is it really asking so much to have a dual SIM phone with microSD card slot as an extra slot for memory?
Seriously! You know what...If it is, then just give me inbuilt memory of 32GB bare minimum inside the phone itself. If one manufacturer can do it, all can.
Camera - High quality point and shoot in low light will no that can take a pretty decent video
12mp minimum rear-shooter with f1.8. Ideally I want to take 4K videos at 30fps as well with good stabilisation
I'm not a selfie-maniac, so anything from a 5mp and UP as a front shooter camera at f2 is fine for me
Every year I see these changes in camera types, megapixel and feature rich enhancements...yet my P10+ fails to take good quality sharp images in medium to low light. Some cameras like my P10+ over-saturate in post production...one of many adjustments manufacturers make within their apps. Just give me a pretty basic 12-13mp camera that is top of its class for taking brilliant sharp pictures in any light but also able to shoot good video at 30 or 60fps 1080p and 4k videos at least 30fps; nothing too fancy, just minimum expected these days.
Accessibility is everything - so give me what all-half decent phones have today...
Bluebooth (4.0 minimum)
NFC
WIFI 802.11ac, DLNA, WiFi Direct, Hotspot
All the sensors for smartphones; accelerometer, gyro, proximity, compass
Wireless charging
Why are Samsung seemingly the ones ones who want to offer this?
I can go without, but don't see why so many manufacturers who do offer this, cut so many other corners on other features mentioned here
A newish OS without excessive bloatware
I'd be happy with Android 7 Nougat or 8 (Oreo). Take off the bloat and give me the basic apps required on the phone without locking them down
CPU/RAM - Just give me a chip which handles dual-active SIM's with battery efficiency
I'm happy with a 4GB amount of RAM. It doesn't need to be 6GB or above top of the line.
Look at Asus Zenfone 2 from 2015. It handled dual-active SIM slots using Intel Atom Z3580 Quad-core 2.3 GHz with GPU PowerVR G6430. I'd suggest 3 years on from this release, anything above this will do...as this is really, a bare minimum.
Can't forget about connectivity - the basic ports will do
- USB Type C (USB 3.0 idea) with fast charge capabilities
- 3.5mm headphone jack; even though I'm moving to a bluetooth ear or headphones, the port should still exist for users who want and need it
- REAR MOUNTED Fingerprint sensor
While I'm not fussed, I liked the idea of LG v20's fingerprint sensor which doubled as a power button. 2 in 1. Also hard to accidentally knock if it's in a case. I can't stand front facing sensors, it's much more easy and convenient to whip the phone out of your pocket and lock without having to get your thumb fiddling with front sensors.
Battery technologies and improvements have been made, so STOP giving us 3000mAh to 3200!
If Huawei and other manufacturers can do it, why can't all phones by 3600 to 4000mAh at minimum now?
Infrared (IR) blaster. WHY is this a dying art?!
If your phone can be used as a backup remote for your TV, set top box, air con years ago, then why is this economical option disappearing from phones? Include one!
If we truly want to make an all in one device and have it be really smart, give it an IR blaster, or even a sensor for learning other IR remotes.
I do not need me phone to
- Be an all metal design; if plastic helps boost the mobile/data signal then I'll just use a case on it!
- Be WATERPROOF; unlike all those idiots with videos on youtube, scratching, dropping, burning and swimming with their phones. DONT need it! Splashproof maybe.
- Be squeezed for a certain action to take place
- have a 99.5% "screen to body" ratio. This is silly, just give me a good screen!
- Have one over-the-top insanely expensive feature, like a 22mp camera; or 8GB of RAM
- Destroy all geeky benchmarks. Nope. Just perform standard or above average. One that performs will with multi-tasking apps, the occasional games and FHD video playbacks
So what do you think? Agree/disagree? If apps or key features like controlling certain pro camera features or changing the LED notification light colour is locked down, the manufacturer needs to open this up up their consumers who will want to use the phone in their own way. Googling phone by feature and popping these features in yields no results, and only 3 or 4 phones come fairly close. LG v20 and P10+ which has a faint LED light and lacks system root; only OS root.
/end rant
RoOSTA

No one likes the idea of a smartphone with those features?
Sent from my [device_name] using XDA-Developers Legacy app

There's been hundreds of these posts/threads over the years. Everyone has their own idea of a perfect phone, most of which will differ completely to yours (There's several things i would have that you haven't mentioned and 4 things you don't want, i do).
Not sure what kind of answer you are expecting to a rant about phone specs on a hacking forum - This would be better directed at the actual manufacturers.

Perhaps that's the idea of a forum..? Shares thoughts, interests and ideas...and this is general smart phone discussion isn't it? Have you found sending a single request as a sole consumer to manufacturers has helped (and led to actual product development in the past) ? Don't think so.
Sent from my [device_name] using XDA-Developers Legacy app

My post still stands. Yes the iea of a forum is to share ideas - Yours is a rant.
And yes, i have made a change with a manufacturer (In vaping) by myself (In the correct place).

So share it?
Sent from my [device_name] using XDA-Developers Legacy app

90hz or 120hz

Hi guys shot in the dark here but is it at all possible to have a higher refresh rate enabled as I've read that one of the Chinese phones (think it was oppo) was modded via kernel to overclock the refresh rate of the panel to something like 84hz
Not a problem if not just have to wait for the note 20 if not
Just be nice if possible
Thanks

any screen/monitor/tv that is capable of "modding" to a higher refresh rate is because the hardware supports it and was only limited by the software/firmware. So modding the software/firmware unlocks the full hardware potential.
The Note 10's screen just not capable of higher rate at a hardware level AFAIK.

Note 20 Ultra Heart Rate Sensor omitted

My new Note 20 Ultra seemed defective because it would not measure heart rate in the Samsung Health app. I sent it to the repair station in Texas. They said the phone was working properly and sent it back. Still no ability to measure heart rate. Called Samsung Customer Service and was informed that the Note 20 Ultra did not have a heart rate sensor.

previous note 10 didn't have it either. what made you think it had inbuilt heart sensor?

This just made me laugh
When buying a phone read specifications of it and don't guess it has heart rate sensor. If it did it would be near camera lens. But note 10 and note 20 has not got this. Last phone having it is note series was note 9 and in s series it was s10 series having it last time. S20 and newer does not and note 10 and newer also do not have it.

My last phone, a S10 had it and my wife's current phones a S9+ and a Note 9 both have it.
When I upgraded to the Note 20 Ultra I erroneously assumed that since it was a top of the line phone that it would also have it.
There is an item in the camera group that I thought was the heart rate sensor. It is not labeled on page 5 of the manual. Turns out that it is the Laser AF Sensor. My erroneous assumption.

Very true. Even when I shifted to Note 20 Ultra from Note 9 was surprised to find out that no heart rate sensor was there on the device.
For a top of the line phone this seemed surprising.

Note 9 user here. Apart from the standard heart rate and SpO2 sensors, I believe that another app can do that using the normal lens next to the flash. At least on mine it does and the results are pretty much similar to what the dedicated sensors give.
I don't know whether that could work if the sensors are missing, but you can give it a try. iCare health monitor is called

mobile light sensor placement

I think screen brightness could be greatly improved by having a light sensor on the back as well as the front, and doing some math between the two to get appropriate brightness. Has this not already been done?
Screen brightness should most match the brightness of the environment behind the phone where your eyes are looking, not in front of it.
I find the brightness of many phones to be annoying and inaccurate, and constantly change unnecessarily of there is a light directly above the phone. I have a OP 7T

Hi! It's a good idea, but manufacturers have already thought about it.
The Samsung Galaxy Note7 was the first smartphone with such a setup (brightness sensors on both the front and the back), and since then, many other manufacturers have followed suit: Apple with the iPhone 14, Google with the Pixel 6, and probably some others.

Wow amazing its already done. Thanks for your response.