Voltage sensor reading

[Cheredanine]

Using a lux, not tried on other FCs, 2.4 RC7 with props off and no tx input. Voltage in cf setup page varies by approx 1v+ (currently sat with a 4s battery plugged and in reads from 15v to 16.1, rapidly oscillating back and forth. (When flying getting low voltage warnings way too soon appearing very briefly with this pack at this voltage - happens with all packs) Flashed with CF (colibri target) 1.2 rc2 and same issue appears.

Flashed with BF 3.2.5 and voltage stays steady at 15.6v Flashed with CF 1.11 (colibri target) and voltage stays steady at 15.6v

(Not raised issue in CF section, clearly an issue for PID scaling to voltage)

[mikeller]

I can confirm that this is happening with a Naze32 rev 6 and betaflight 2.4.0-RC7 as well.

I got random and sporadic battery warnings when flying. Flashed back to 2.4.0-RC6, with the same battery (never removed from quad), and the problems are gone.

[Cheredanine]

Confirmed on lux, rc6 doesn't have the issue

[borisbstyle]

anybody has a log? Op 12 feb. 2016 05:46 schreef "gerro1977rm" notifications@github.com:

Same thing happens on a CC3D with beatflight 2.4.0 rc7 as well.

— Reply to this email directly or view it on GitHub https://github.com/borisbstyle/betaflight/issues/183#issuecomment-183178783 .

[mikeller]

Hi @borisbstyle.

On 12 Feb 2016 7:02 pm, "borisbstyle" notifications@github.com wrote:

anybody has a log?

I can generate one tonight.

[borisbstyle]

@Cheredanine This is not an issue in PID scaling to voltage feature. This is something else. RC6 also had the voltage scaling and that works

[mikeller]

Hi @borisbstyle.

Got a log for you. It has the first voltage warning about 30s in, then keeps on going on and off for a couple of minutes.

https://drive.google.com/file/d/0B_6c1X6V1qkAeENHQi1HQVQ0OWM/view?usp=sharing

Hope that helps shed some light on what's going on.

[Cheredanine]

@borisbstyle sorry should have been clearer, I didn't mean it was an issue IN PID scaling, I meant it is an issue FOR PID scaling

[readerror67]

Testing with a Lux and RC7 on the bench w/ a lab PSU, shows steady at 15.2V w/o any fluctuation, maybe something different happens when armed though.

[Cheredanine]

@readerror67 didn't need to arm, when I was testing just literally flashed, connected and plug in lipo. That was how I went through the releases

[mikeller]

Hi @readerror67.

Probably. I only ever seen it happen when armed, or after disarming after flying.

[readerror67]

There were a few changes to the battery ADC stuff in the past few days... https://github.com/borisbstyle/betaflight/commit/27772ba56aafd0aa0497280472e4e2ade9bc8262#diff-ba13bb2051b35b7f32675cbeefd2f2fbR79

https://github.com/borisbstyle/betaflight/commit/83d8a8441c7db6aea6ff669e7cf1f6464a1e5022#diff-ba13bb2051b35b7f32675cbeefd2f2fbR72

Odd that the issues are all across the board though, some armed/flying and others on the bench and some, no issues.

I can't hook up a debugger right now but also can't replicate the issue so unsure how much help I would be.

[Cheredanine]

I noticed it whilst flying due to the low battery alarm mate, suspect it is always there, just didn't notice in config when first flashed Assume your lab supply isn't a lipo pack, suggest you try with one

[readerror67]

DE just commented: https://github.com/borisbstyle/betaflight/commit/bb09f5da2b10e381af98565241b5dfe16aba6e4d#commitcomment-16054944

[borisbstyle]

Fixed here https://github.com/borisbstyle/betaflight/commit/49ab107e2607ea84cc833edacecdc91b22244cb1

[Cheredanine]

Want this closed?

[borisbstyle]

I will first release RC8 and close it

[Cheredanine]

Cool, will leave to you, assume it is being added to cf 1.12 rc2

[borisbstyle]

I made a PR to cf1.12

[Cheredanine]

@borisbstyle RC8 7/10 mate, it has dramatically reduced (current fluctuation is between 16.3-16.7V on default scaling, but clearly still there, flashed back to RC6 and voltage reading is stable and solid, flashed back to RC8 and still all over the shop, just over a smaller range than RC7

[borisbstyle]

@Cheredanine Can you post a log of it. Battery can fluctuate a bit of course. It's about how it holds during flight

[Cheredanine]

@borisbstyle you mean blackbox? I dont have a bblogger :( if I can provide something else - tethered logging, video etc, happy to)

(risk of natural fluctuation was why I went back to RC6 - this stays stable, RC8 is noticably different

[borisbstyle]

vbat isnt really stable......as long as it doesnt go down to 1volt etc that should be fine. 16,2-16,3-16,8 its all fine.

In the RC7 it would go down to 1V etc

[Cheredanine]

no, in RC7 the upper and lower limits of its fluctuation was 1V appart (with the pack I used for bench testing it would vary from 15.0 to 16.1V or at least that was what was showing when using an MSP connection (MWOSD or CF Configurator)

in RC8 it is jumping up and down (on a charged pack) between 16.3 and 16.7 reasonably quickly (it doesnt stay still)

in RC6 and all earlier releases it sits still on a reading

[borisbstyle]

@Cheredanine Ok glad to hear that anyway that the jumps are just that small. That can be easily fixed

[Cheredanine]

https://onedrive.live.com/redir?resid=5957BA8F0800A782!1630&authkey=!AOyrvhy9gWVG_RE&ithint=file%2cMOV

hope that works, it should be a vid so you can see behavior

[borisbstyle]

@Cheredanine Can you download this file and rename to .hex and see how it goes

[Cheredanine]

same, (16.1 to 16.5V)

[borisbstyle]

Can you try this one. Not different, but it has debugging added. Go to sensors tab and click on debug. THere you can see debug 2 and debug 3. Tell me what it does and post a screen. Also speed up the reading to 10ms

[Cheredanine]

behavior as described above and shown in video, debug screen capture attached

[borisbstyle]

Looks actually stable to me

[Cheredanine]

and yet it is moving up and down by about half a volt (see vid) https://onedrive.live.com/redir?resid=5957BA8F0800A782!1632&authkey=!AG8u14PeE7Ip6ic&ithint=video%2cmov

[borisbstyle]

The line still looks pretty flat. I would just fly and see how it goes

[Cheredanine]

happy flying it mate, was happy flying rc7. I know how long my lipos last cut a little time off in case power draw increased.

it is going to cause flakey voltage alarms and it is going to get comments from the liveware because there was a stable voltage reading in cf 1.11 and BF2.4 rc6 and earlier.

bear in mind the fluctuation is not under load with in flight voltage sag it will be a bigger variation. I can no longer glance at my voltage reading in my osd and know what my voltage is, I have to watch it for a few seconds and figure out the average,

it is of course your choice to close or not and if not how much effort to put in to resolution :) will be flying rc8 at lunchtime shortly

[borisbstyle]

I am not saying that i will leave it but its good for now. I will test when I get home.

rc7 had a bigger underlaying problem what needed an immediate fix. Op 12 feb. 2016 12:32 schreef "Cheredanine" notifications@github.com:

happy flying it mate, was happy flying rc7. I know how long my lipos last cut a little time off in case power draw increased.

it is going to cause flakey voltage alarms and it is going to get comments from the liveware because there was a stable voltage reading in cf 1.11 and BF2.4 rc6 and earlier.

bear in mind the fluctuation is not under load with in flight voltage sag it will be a bigger variation. I can not longer glance at my voltage reading in my osd and know what my voltage is, I have to watch it for a few seconds and figure out the average,

it is of course your choice to close or not and if not how much effort to put in to resolution :) will be flying rc8 at lunchtime shortly

— Reply to this email directly or view it on GitHub https://github.com/borisbstyle/betaflight/issues/183#issuecomment-183287950 .

[borisbstyle]

can you try this one?

[Cheredanine]

well it was different, voltage constant at 1.3V (on a 4S)

[borisbstyle]

oh....lol. I think i sent you a wrong hex. Will send a new one. Op 12 feb. 2016 14:25 schreef "Cheredanine" notifications@github.com:

well it was different, voltage constant at 1.3V (on a 4S)

— Reply to this email directly or view it on GitHub https://github.com/borisbstyle/betaflight/issues/183#issuecomment-183326892 .

[borisbstyle]

[Cheredanine]

better, getting mostly 16.4/16.5 with variance from 16.2 to 16.7

[Cheredanine]

For info Domonic asked me to raise PR in CF: 1817

[borisbstyle]

is this an issue in cf 1.12 too?

[digifaps]

hi , I fly the LUX , not really doable , i get a flight time of about 2 minutes , was 5 before, mainly due to VBAT going low in the first minute, can really punch of i have voltage message on my OSD.

I'm running RC8

[Cheredanine]

@borisbstyle in 1.12 rc2 yes, not in 1.11 and did not check earlier RC of 1.12

[digifaps]

Hi Boris, can it be that the link you posted up higher isn't working anymore ?

[borisbstyle]

On the last RC9 my Vbat voltage is rock stable. When not flying it doesnt even fluctuate.

I tested this on naze32, Dodo and SpracingF3

[digifaps]

yes can confirm , much better now. thnx !

[borisbstyle]

I will close this issue. I know @Cheredanine has some higher fluctuations, but I for sure don't have it anymore.

[oliv98]

I just flashed with latest 2.4.1 and still seeing the issue.about 1 volt error max, fluctuating, not event arming. Using Naze32 rev6

[digifaps]

Hi, I have to admit it is nowhere near the old VBat monitorring , somehow it seems very twitchy , and it indeed still fluctuates a bit.

If i can help out with some tests I'll be happy to do so.

[oliv98]

yes this is annoying and thus reducing flight time