FrSky GPS (V2) Sensor using Smart Port (S.Port)

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bob195558
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FrSky GPS (V2) Sensor using Smart Port (S.Port)

Post by bob195558 »

Hi
May be having a problem with the telemetry data using FrSky GPS (V2) Sensor using the Smart Port (S.Port) connection.

List of components used:
FrSky GPS (V2) Sensor
FLVSS Smart Port LiPo Voltage Sensor
FrSky X8R receiver
ErSky9x on Taranis-x9d using the internal XJT module
ErSky9x firmware: V.5023-Mike / 22.05.2016 / SVN: erx9d-pr219
Using a 3S LiPo battery to power model.

I have the FrSky GPS (V2) Sensor connected first to the X8R Smart Port and second a FLVSS LiPo Voltage Sensor
which is connected back to the FrSky GPS (V2) Sensor.
The Red LED looks to be flashing fast all the time, but after about 5 to 8 minutes it has showed
and now has some GPS data showing on the ErSky9x on Taranis telemetry data screens.

I may have some of the telemetry settings improperly set, below is some photos showing the telemetry setting which I have.
1 Telemetry Screen
1 Telemetry Screen
2 Telemetry Screen
2 Telemetry Screen
3 Telemetry Screen
3 Telemetry Screen
4 Telemetry Screen
4 Telemetry Screen
5 Telemetry Screen
5 Telemetry Screen
Are my GPS Telemetry settings correct ?

I carried the FrSky GPS Sensor (V2) many times down and up the hill (about 45 feet vertically).
Also note the wind became very gusty which may have adding data error to my readings.
ErSky9x GPS telemetry Data Screen_7
ErSky9x GPS telemetry Data Screen_7
ErSky9x GPS telemetry Data Screen_8
ErSky9x GPS telemetry Data Screen_8
Barometric Altitude: Alt (I can 0 out this reading, but seems to become unstable as the data went minis when going up and plus when going down. Also the data readings were changing a lot when in the same position sometimes by 27 feet).

GPS Altitude: Galt (This data dose not change much and I think it may be reading in meters and not able to 0 reading out).

GPS Speed: Gspd (This seems to be working correctly).

Barometric Vertical speed: Vspd (Seems to be working correctly though have not flown with it yet).

GPS Heading: Hdg (Dose not work with FrSky GPS (V2) Sensor).
Acceleration X: AccX (Dose not work with FrSky GPS (V2) Sensor).
Acceleration Y: AccY (Dose not work with FrSky GPS (V2) Sensor).
Acceleration Z: AccZ (Dose not work with FrSky GPS (V2) Sensor).

I am more use to using the FrSky High Precision Vario (FVAS-02H) for the Barometric Altitude (Alt)
which is quicker and more accurate with its data reporting.
ErSky9x GPS telemetry Data Screen_9
ErSky9x GPS telemetry Data Screen_9
In this photo "Alt= 369 has a small "m" after, dose this stand for "meters" ?
Also what is the "Max= 0" for ?


Bob B.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).

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MikeB
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Re: FrSky GPS (V2) Sensor using Smart Port (S.Port)

Post by MikeB »

Your settings look correct. I haven't particularly used the GPS Alt value myself, I'll need to hook my GPS sensor up and also test it.
The small 'm' is indeed metres, the Max= value should be the maximum value of Galt (maybe it doesn't work!).
Acceleration is only provided by the specific acceleration sensor, not by the GPS.
I not sure the GPS Alt value is very accurate, I'll check back in a log file when I was testing something else to see if I have anything useful on it.
GPS heading only gives a useful value when the GPS sensor is moving at a reasonable speed when it can compare a previous position with the current position.
This is from a log file I have when I had both a Vario and a GPS.
The vario values are in feet while the GPS values are in metres. As you can see, the GPS altitude was not very responsive and lagged.

Code: Select all

AltB	AltG
0	109
0	109
0	109
0	109
0	109
0	109
0	109
0	109
0	109
0	109
0	109
0	109
0	109
0	109
0	109
1	109
2	109
0	109
0	109
0	109
1	109
-1	109
4	109
22	109
42	109
68	109
99	109
109	109
123	109
126	109
130	109
132	109
135	109
144	109
157	109
167	109
176	109
184	109
187	109
188	109
183	109
185	109
185	109
176	109
162	109
148	109
138	109
126	109
119	124
120	124
121	124
126	124
129	124
132	124
136	124
170	124
240	124
245	124
182	124
140	124
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146	124
157	124
171	124
186	124
205	124
216	124
219	124
222	136
235	137
246	137
250	141
257	141
265	141
273 	141
282	141
306	141
324	141
338	159
355	159
372	159
391	159
406	159
420	159
433	159
445	159
464	159
479	159
492	159
506	159
517	159
519	159
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519	159
524	159
535	159
548	159
561	159
575	159
588	159
597	159
604	159
618	159
626	159
614	159
590	159
575	159
568	159
584	159
614	159
643	159
664	159
687	291
703	286
Mike.
erskyTx/er9x developer
The difficult we do immediately,
The impossible takes a little longer!
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bob195558
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Re: FrSky GPS (V2) Sensor using Smart Port (S.Port)

Post by bob195558 »

Hi Mike,
Thank you for looking at this Smart Port FrSky GPS (V2) Sensor.
I have had this FrSky GPS for almost a year now and back when I first tried it, it did not seem to work at all.
I think its time for me to start using the FrSky X-Series telemetry, so I wanted to try this FrSky GPS (V2) Sensor
to see how it works (if it even did work at all).
I have learned with using the MultiWii Flight Controller w/ GPS that when the GPS has not powered
on for several months it will take about 10 minutes to acquire satellites.
(I think this may be, because the on-board battery needs to be charge up but I am not sure why this happens).
And when using the MultiWii GPS more frequently, the GPS acquire the satellites in about 1minute or so, (much quicker).
It makes no difference with this Smart Port FrSky GPS (V2) Sensor as it still takes a long time, 7 to 10 minutes to acquire satellites.
It is only a shorter time to acquire satellites when power off and back on in a very short time,
other-wise it takes 7 to 10 minutes to re-acquire the satellites.

This FrSky Smart Port GPS (V2) Sensor dose not work very well and I can not see much benefit from using it,
as to its data reporting is very slow (late) and inaccurate (bad data reporting).
I will try to use it for awhile, but I think it end up in one of the dead components RC boxes.

I really like the FrSky Smart Port FLVSS LiPo Voltage Sensor and with using the
Taranis telemetry screen selectable 9 places data sensor readings, see photo below.
I like being able to see the LiPo Cell Voltages Totaled (Ctot) and each of the
individual 3S LiPo battery cell voltages (Cel 1), (Cel 2), (Cel 3), see photo below.
3S LiPo Battery telemetry data readings.
3S LiPo Battery telemetry data readings.
One-other observation when changing from D-Series to the X-Series telemetry, the RSSI signal strength data reporting
is lower with the X-Series compared to the RSSI signal strength data reporting from the D-Series.
This dose not build confidence in the FrSky Smart Port X-Series telemetry data reporting products.

Also with the X-Series telemetry reporting, I am receiving a Voice-Warning to the
Lost of Telemetry Connection more often then with the D-Series, which I think may be the TSSI signal being lost.
Is this Voice-Warning to the Lost of the Telemetry Connection, our old TSSI signal being lost ?

Bob B.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).
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MikeB
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Re: FrSky GPS (V2) Sensor using Smart Port (S.Port)

Post by MikeB »

No. When a telemetry frame is received I reset a timer to 35. This counts down every 10mS and if it reaches 0, then you get the telemetry lost message (so after 350mS of no telemetry frames being received). There are actually two timers, one for the receiver information and one for user (sensor) information. If you log the telemetry you can see these values in the "valid" column (100 times one plus the other).
"TmOK" also shows 0 if no telemetry, 1 for receiver data and 2 for both receiver and sensor data.

Mike.
erskyTx/er9x developer
The difficult we do immediately,
The impossible takes a little longer!
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Kilrah
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Re: FrSky GPS (V2) Sensor using Smart Port (S.Port)

Post by Kilrah »

X series will lose telemetry feed intermittently if the receiver is too close to the radio, that's usual.

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jhsa
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Re: FrSky GPS (V2) Sensor using Smart Port (S.Port)

Post by jhsa »

Not only the X series.. That also happens with my DJT module, although I have only noticed it recently..

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bob195558
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Re: FrSky GPS (V2) Sensor using Smart Port (S.Port)

Post by bob195558 »

Thank You for your replies they are very helpful.

Bob B.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).
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bob195558
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Re: FrSky GPS (V2) Sensor using Smart Port (S.Port)

Post by bob195558 »

Carbo wrote: Sun Jul 30, 2017 10:39 am The FrSky GPS has a noticeable delay. If you want a fast GPS, switch over to openXsensor.
(viewtopic.php?f=97&t=10339&p=129959&hilit=GPS#p129958)
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).
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bob195558
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Re: FrSky GPS (V2) Sensor using Smart Port (S.Port)

Post by bob195558 »

Here is where to find the "FrSky GPS V2 Sensor" Manual: (https://www.frsky-rc.com/gps/).
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).

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