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Old Jul 29, 2011, 08:49 AM
New in all but 20Y hobbyist
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Gratens, little place around Toulouse...
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Quote:
One thing became obvious though, we need a divider for RPM in the DHT-U Settings Menu, for two blade, three blade or four blade props.
No way, this is for the second batch ;-)
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Old Jul 29, 2011, 10:13 AM
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Romania, Dolj, Craiova
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Huh... isn't the firmware user upgradable ?!
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Old Jul 29, 2011, 10:16 AM
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Sunnyvale, CA
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Originally Posted by RENATOA View Post
Huh... isn't the firmware user upgradable ?!
Yes, it's upgradable.
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Old Jul 29, 2011, 10:30 AM
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Originally Posted by PLMS View Post
Yep, that's a big improvement I think. Also there needs to be a rearrangement on the Accelerometer screen. Want to work some photoshop magic on that one ?

There is a lot more scope for change on this one. The annunciation text for Speed, RPM and Altitude could be just appended to the end of the values.

Speed

0.00

to->

0.00 KPH

Or they could just be 'boxed up' like your improvement on the Volt readings.

Also I'm thinking the GMT Time display on the top line is a bit superfluous on each page, it really only needs to be on one page IMHO ?
Then the AccX, AccY, AccZ could move up one line. What say you guys ?
Bit quick and dirty, but is food for thought.

For me, the acceleration data is not the first thing I want to see, so I moved it to the bottom and enhanced the readability of Speed, RPM and Altitude. I'm not sure how much resolution there is to play with on this LCD, so it could just be an academic exercise.

The ability to add/remove data by sensor type would be nice, because I don't see everyone using all the sensors - I don't need the Fuel indicator for example.

Regarding the time display, I couldn't find anyway to set it manually, but all of a sudden it is correct - I'm guessing it picked it up from the GPS?
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Old Jul 29, 2011, 11:26 AM
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Changed the font to see how it would look using the standard dot fonts used on the LCD. Could probably increase the size a bit.
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Old Jul 29, 2011, 12:25 PM
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Germany, lake of constance
Joined Oct 2010
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Hi Martin

Many thanks for your measurements regarding the rpm sensor.

Best regards
Micha
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Old Jul 29, 2011, 01:40 PM
Sudden Freak
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Atlanta, GA
Joined Oct 2006
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Maybe I'm missing something... but why in the world would you need to see the data from accelerometers on the telemetry screen?
To see how many G the tiny pilot in the airplane model is experiencing so his painted eyes won't fall out?
Or just because we can?
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Old Jul 29, 2011, 03:06 PM
Dean
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USA, CO, Littleton
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Originally Posted by c2po View Post
Maybe I'm missing something... but why in the world would you need to see the data from accelerometers on the telemetry screen?
To see how many G the tiny pilot in the airplane model is experiencing so his painted eyes won't fall out?
Or just because we can?
Good one!!!
I thought it may have something to do with rate of climb??
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Old Jul 29, 2011, 08:53 PM
Martin - AKA mr.sneezy
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Adelaide, Australia
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Originally Posted by horsj View Post
Changed the font to see how it would look using the standard dot fonts used on the LCD. Could probably increase the size a bit.
Good work. That looks much better. It will give FrSky a direction to go in at the very least.
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Old Jul 29, 2011, 09:00 PM
Martin - AKA mr.sneezy
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Originally Posted by c2po View Post
Maybe I'm missing something... but why in the world would you need to see the data from accelerometers on the telemetry screen?
I've been pondering that question myself. The answer might be more about what you can do with the data, rather than the actual G values.
Maybe we need a bit of brainstorming here.
One thought I had was virtual artificial horizon and pitch display on the LCD, maybe relevant to FPV or big gliders. If the sensor is fitted properly (leveled) that should work.

Edit: Nope it doesn't, see post below
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Old Jul 29, 2011, 09:31 PM
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Atlanta, GA
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Originally Posted by PLMS View Post
I've been pondering that question myself. The answer might be more about what you can do with the data, rather than the actual G values.
Maybe we need a bit of brainstorming here.
One thought I had was virtual artificial horizon and pitch display on the LCD, maybe relevant to FPV or big gliders. If the sensor is fitted properly (leveled) that should work.
Nope, you can't do that. To get more or less meaningful artificial horizon indicator you need at least gyros AND accelerometers AND a fusion algorithm to mix them, look at the auto-stabilization systems in the multi-rotor forums.

With just accelerometers on the moving vehicle you will see data like on the attached picture, which is totally useless even on the graph, I'm not talking about just raw numbers.
So I would scratch that sensor off your plans and off the precious LCD screen space, you don't need it in realtime. I'm not sure why FrSky even made it as a part of telemetry packet, well, except maybe measuring extremities (max positive and max negative) just for fun.
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Old Jul 29, 2011, 09:52 PM
Martin - AKA mr.sneezy
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Originally Posted by c2po View Post
Nope, you can't do that. To get more or less meaningful artificial horizon indicator you need at least gyros AND accelerometers AND a fusion algorithm to mix them, look at the auto-stabilization systems in the multi-rotor forums.
Thanks for the info about stabilization needing gyro's. I'm not into it myself.

Might need to hear from FrSky as to what the main function of the Acc sensor is then ?

One more idea I had was for Pylon Racing models perhaps, to measure any improvements in cornering G's or measure your turn to turn consistency. With the speed data from the GPS could that be useful ?
(any plyon guys here?)
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Old Jul 30, 2011, 03:54 AM
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Birmingham, UK
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used with an audible warning the accelerometer might be valid for larger or more delicate models where you have a G limit, other than that very limited audience I guess it's there 'because we can'.
For me the sensors that make sense are
1) Battery level - all types of model can benefit
2) Fuel level - for IC, obviously, but only if it's reliable
3) Vario - only useful for soarers
4) RSSI - but not as it is, it starts beeping far too early while well within range.
5)...
erm, I think I've run out of ideas that will actually be of use rather than an unnecessary distraction, but then I would consider myself just an ordinary club flier, ie representative of the mass market. I'm sure there are bucketloads of specialist limited market applications, but selling half a dozen units a year to techies isn't going to pay FrSky's bills, so anything else needs to be a secondary feature in my opinion.
Rather than the visual display I'd be more focused on the audio capabilities, I want to fly, not have my attention diverted watching a screen, and I'm sure that goes for most club fliers. Ideally warnings need be via an earpiece. Bluetooth would be nice as long as it didn't hammer the TX battery too much - have you ever stood on a flightline with several TX emitting random beeps and chirps? Bloody confusing.

Just my twopennorth.
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Old Jul 30, 2011, 09:13 AM
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Australia, NT, Anmatjere
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Quote:
Originally Posted by BrumBob View Post
used with an audible warning the accelerometer might be valid for larger or more delicate models where you have a G limit, other than that very limited audience I guess it's there 'because we can'.
For me the sensors that make sense are
1) Battery level - all types of model can benefit
2) Fuel level - for IC, obviously, but only if it's reliable
3) Vario - only useful for soarers
4) RSSI - but not as it is, it starts beeping far too early while well within range.
5)...
erm, I think I've run out of ideas that will actually be of use rather than an unnecessary distraction, but then I would consider myself just an ordinary club flier, ie representative of the mass market. I'm sure there are bucketloads of specialist limited market applications, but selling half a dozen units a year to techies isn't going to pay FrSky's bills, so anything else needs to be a secondary feature in my opinion.
Rather than the visual display I'd be more focused on the audio capabilities, I want to fly, not have my attention diverted watching a screen, and I'm sure that goes for most club fliers. Ideally warnings need be via an earpiece. Bluetooth would be nice as long as it didn't hammer the TX battery too much - have you ever stood on a flightline with several TX emitting random beeps and chirps? Bloody confusing.

Just my twopennorth.
Same While we are fortunate frsky has given us more than enough options the large display weight / all to much data to watch wile flying for me, ill need a copilot.

The new lcd there working on will be interesting hope release is only 2 months as hoped .

Have some information on the coming lcd, eva says it will be similar size as FDD- Light display, pricing a bit more.
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Old Jul 30, 2011, 10:07 AM
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Belgique, Région Wallonne, Liège
Joined May 2009
6 Posts
Hello everybody!

I am new to this forum so let me just briefly introduce myself:being a young (only 59 !) retired airlline pilot, I am importing FrSky products in Europe.
(forgot to say It all started for me with control line 47 years ago then switched to RC models a few years later, then switched to full scale...)

I received the DHT-U + sensors two weeks ago for testing and evaluation purpose.

My first conclusion was that this new product looks very promising and needs little to be even much more efficient as I wrote a few days later to FrSky.

I am happy that your remarks go in the same direction.
PFD ( Primary Flight Display) should be as ergonomic as possible,considering the small size of display and computing limitations.

As some of you already noted, It is necessary to rework that main screen:

A starting point for discussions about a good PFD could be something like the following, but it is only a quick approach and needs everyone's input!
With that help, I am sure that FrSky engineers will soon be able to find out what could be done or not.

Upper line:
Top left corner: T° Nr1 ( could be engine if IC or Lipo if elec powered)
Miiddle : RPM ( after division) or Heading if GPS equipped)
Top right corner: Fuel or Battery level if elec pwr ( according setting page)

Remark: if it is possible, RPM just under T° Nr1 when Heading displayed in middle ?

Middle of display: Left: Speed ( + MPH or + KM/H) No need to write speed, if you add the unit.(It comes from GPS, so it's a Ground/Speed)
Middle: Vertical Speed , BIG char! + m/s or +ft/min
Remark: (V/S still Needs to be calculated with alt + clock)
Next to the vertical speed a vertical bar graph to show V/S
Right: Altimeter + m or + ft ( good it can be set to alt above gnd)

Lower part:
Left: RSSI Tx
Middle: Rx battery level or any other Voltage choosen in setting page.
Rght: RSSI Rx

This is not " The solution", only some ideas from which to start a discussion and get everyone's constructive input.

Anyone ready to do some CAD to show some nice pictures of what it could be?


About the accelerometer:

-discard these accelorometer readings ! ( no use except to record some informations on SD card for later study, for people who would enjoy this ...) recording of higher values for display when requested at the end of flight might be interesting in some circumstances.
- I asked FrSky to put the accelerometer info's on a secondary page with other less relevant informations like the GPS ( which is good to record and show last known position on request ) No need to print accx, accY,accz, lontitude, latitude, etc...titles, just end the value with N, S W, or E , same applies for acc with X, Y , Z with rounded values to lighten a little bit the density of data's displayed.
- As also noted here, I asked FrSky to introduce a divider value in the setting page for RPM showing.

Hoping this humble input will help in taking the best out of this very interesting new DHT-U and sensor system.

Happy Landings!
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Last edited by CaptainBlueSky; Jul 31, 2011 at 07:22 AM.
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