Flight Pack Capacity

[JayPi01]

Today I flashed my 9x (frsky mod) with the latest open9x (1195). Then I created a new model, went to the telemetry config screen and configured A1 with range 40.0A, no offset. At UsrData: Proto None and Current A1. After I powered my receiver (D4FR) on with around 4.6V the telemetry display of the tx showed at A1 14.1A. What is very strange is that the calculated capacity sums up very fast. It took for around 1000mAh only 1min what means A1 should read around 60A. Another strange thing is that when I went to the telemetry config screen (rx still on) and configured display to only show A1 -> back to telemetry screen to show A1 -> back to telemetry config screen and disconfigured display to only show A1 -> back to to telemetry screen the reading of the calculated capacity is very slow. Now it took more then 8min for 1000mAh. After I turned the tx off and on again the reading of the calculated capacity is again very fast. Am I doing something completely wrong?

Joerg

[gbirkus]

what is your current sensor type?

[JayPi01]

what is your current sensor type?

type is 'none' so current is proportional to measured A1 voltage.

[gbirkus]

ok. i only have fas-100 sensor. But later i try to do some test with volt sensor connected to A1 and setting it up like current sensor.
bdw: A1 need to have voltage from 0-3.3 Volts. If it is used like current what voltage output is on sensor when 0Amp is consumed? 0 or 1.65 V ?

[JayPi01]

bdw: A1 need to have voltage from 0-3.3 Volts. If it is used like current what voltage output is on sensor when 0Amp is consumed? 0 or 1.65 V ?

for a first test I only measured receiver battery voltage which is divided over the internal voltage divider. later I will use this sensor:
http://www.flytron.com/osd-headtrackers ... ensor.html
it will output 0V to 5V (have to build a voltage divider).

[gbirkus]

hmm now i see that you use D4RF - there is only RX voltage telemetry value.
if you would like to measure consumed Flight Pack Capacity you must have telemetry for pack voltage and pack current.

For test purposes I tried it with my D8R where A1 is internal voltage sensor (i don't have two external sensors) and A2 external voltage sensor
In open9x telemetry screen I set up A1 channel range and offset to see real A1 voltage (5V on RX) (this is only test then i don't measure battery voltage)
A2 channel set range to 12.6 (3Slipo) now i see 11 volts of my discharged battery. Change on A2 Range v to A (voltage to Ampere)
Now on UsrData section, set Proto to None, Voltage to A1, Current to A2
now on telemetry I see A1=5V, A2=11A, power 550W and consumption still growing mAh.

This is only for test purposes I used two voltage sensors where one of them is configured like current sensor in open9x.
You must have receiver with external A1 and A2 telemetry inputs. (in case you use 2Slipo without BEC it is theoretically enough A1internal and A2external)
or use Hub with current and voltage sensors connected to data port of receiver.

Gabriel

[Kilrah]

if you would like to measure consumed Flight Pack Capacity you must have telemetry for pack voltage and pack current.

Not at all, used capacity only needs current. Voltage is only needed for power calculation.

It seems the bug where scaling is wrong if the current source is A1/A2 is back though:

I see A1=5V, A2=11A, power 550W and consumption still growing mAh.

5V * 11A is 55W, not 550
Now how fast were mAh counting? Might be 10x too fast too.

[JayPi01]

hmm now i see that you use D4RF - there is only RX voltage telemetry value.

at rcgroups are some hacks to modify the D4FR for external voltage

now on telemetry I see A1=5V, A2=11A, power 550W and consumption still growing mAh.

yes, that is ok - but how fast do the mAh grow? for my current reading it grows MUCH to fast. for a reading of
14.1A it should show after 1min around 235mAh and not 1000mAh...
if you want to test it it should show around 183mAh after 1min at 11A or am I wrong ?

[gbirkus]

sure it was 55W i write it after lunch and for consumption it's enough only current sensor.
ok i will do test of the speed later.

[gbirkus]

it is a bug 550W is shown. vhen A1=5V A2=11A
if FAS-100 is used for volts and amperes 55W is shown.

[gbirkus]

14.1A it should show after 1min around 235mAh and not 1000mAh...
if you want to test it it should show around 183mAh after 1min at 11A or am I wrong ?

235mAh(minute) x 60 minutes = 14100mAh(hours) it is 14.1A then it is ok!
for consumption my test on A1/A2 and FAS/FAS looks same 11A current, 1min consumption cca 190mAminute what is 11400mAh
1A current , 1min consumption 16mAminute, 60 times 960mAh cca 1A

[JayPi01]

235mAh(minute) x 60 minutes = 14100mAh(hours) it is 14.1A then it is ok!

yes, that is correct. but my tx shows 1000mAh not 235 mAh at 14.1A.

[Kilrah]

Hmm, might be on something...

What are the options you selected for the firmware in c9x preferences (your hex file name will do)?

[JayPi01]

that is my firmware:

open9x-stock-frsky-nosplash-nofp-potscroll-autoswitch-en.hex

[bertrand35]

But there is no audio here Kilrah! So it's not the same issue than #95, this one has been fixed by Gabriel, am I right?
Bertrand.

[Kilrah]

Nope, which is why I asked, hadn't seen the answer yet

And no, this is not linked to what Gabriel fixed. He fixed power display, I confirmed that was working, but this is about mAh. I could confirm that A2 as current source was badly scaled, in my case by about 2.2x. But then JayPi01 apparently has an error of approx 4x...

[gbirkus]

Yes, the consumption in mAh is the original issue.
but it seems everyone has different scaling issue. in my case there is only 1.2x

Gabriel

[JayPi01]

same issue with open9x-r1336
at 15A it took only 1min for 1000mAh. this is around 4x to fast.

[bertrand35]

same issue with open9x-r1336
at 15A it took only 1min for 1000mAh. this is around 4x to fast.

Which settings do you have on A1?
Bertrand.

[bertrand35]

same issue with open9x-r1336
at 15A it took only 1min for 1000mAh. this is around 4x to fast.

Which settings do you have on A1?
Bertrand.

I have found, it should be fixed on SVN now. I will wait for some tests and release again.
Bertrand.

[gbirkus]

Now it is ok.
A1=15A consumption=250mAminute
A2=1A consumption=16mAminute

[bertrand35]

Excellent, then I will release tonight. For ersky9x users there should be the CPU consumption + its alarm available.
Bertrand.

[JayPi01]

bertrand, thank you for the very fast fixing of the issue. will there be an new 'official' release or should i download via svn and compile myself?
joerg

[bertrand35]

We didn't release yesterday because of an electric problem on the compilation server farm. We will hopefully release tonight.
Bertrand.