Search found 243 matches

by RightRudder
Fri Mar 08, 2013 4:06 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: openXvario development
Replies: 251
Views: 34670

Re: openXvario development

On thinking about it I see one advantage to having the oxv as the last in the chain which talks directly to the rx. Then you can send packets at the rate you choose. The FAS-100 datasheet notes that the data rate is ~1hz.
by RightRudder
Fri Mar 08, 2013 2:42 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: openXvario development
Replies: 251
Views: 34670

Re: Introduction to the openx vario/altimeter

So as I see it there are two alternatives. The FAS-100 has three ports. As you said one rs-232 which is meant to connect to an Rx, and a 2 wire in and a 2 wire out which uses hub protocol. Either the oxv could talk to the 2 wire in or the FAS-100 could talk to the oxv and thern it could talk to the ...
by RightRudder
Fri Mar 08, 2013 2:47 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: openXvario development
Replies: 251
Views: 34670

Re: Introduction to the openx vario/altimeter

Question for Rainer:

If I already have a FAS-100 amp sensor connected to the serial input of my Rx, can I just hook the output of the oXv to the serial in on the FAS-100?

(please say yes)

Joe
by RightRudder
Sat Mar 02, 2013 3:57 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Dual Sensor vario development
Replies: 43
Views: 10877

Re: Dual Sensor vario development

I've been using some HSC type honeywell sensors for another project which would be perfect for this. A bit expensive but you get 14 bits of resolution for a full scale sensitivity of 2.5mbar (that's about 40 times the sensitivity of the MS5611 !) Its probably just my english, but i don't quite get ...
by RightRudder
Thu Feb 28, 2013 2:43 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Introduction to the openx vario/altimeter
Replies: 756
Views: 100099

Re: Introduction to the openx vario/altimeter

SNIP... Ohh.. The Arduino sketch tool won't let me copy paste anything. So if you want the errors. I will have to do it long hand. It also will not show line numbers.. So I really loath it with a passion and that doesn't get any better with use. :( Hey flaps you could always do a pint screen, paste...
by RightRudder
Wed Feb 27, 2013 10:35 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Introduction to the openx vario/altimeter
Replies: 756
Views: 100099

Re: Introduction to the openx vario/altimeter

Flaps 30 wrote:
RightRudder wrote:I think having the altitude at field = zero would be best.
Which we already have at a touch of the Menu button with Open9x


Yes but do you really need to be able to set your field elevation and read the sea level pressure in the rpm field? Why is that important, I'm just curious.
by RightRudder
Wed Feb 27, 2013 10:12 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Introduction to the openx vario/altimeter
Replies: 756
Views: 100099

Re: Introduction to the openx vario/altimeter

Ok, makes sense. I will add an option when i am back from my conference. Really? I was kidding actually. If anyone needs this it would be cool but for most people I think having the altitude at field = zero would be best. We only need to use a common altimeter setting when we are flying full scale ...
by RightRudder
Wed Feb 27, 2013 9:57 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Introduction to the openx vario/altimeter
Replies: 756
Views: 100099

Re: Introduction to the openx vario/altimeter

We should modify the code so that with the tx pot one can set the local elevation above sea level on the 9x display then the arduino reads the ppm value and uses that to adjust the baro offset! ;)
by RightRudder
Wed Feb 27, 2013 3:58 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Introduction to the openx vario/altimeter
Replies: 756
Views: 100099

Re: Introduction to the openx vario/altimeter

Awesome Flaps! I'm still waiting on the postal system.
by RightRudder
Tue Feb 26, 2013 8:55 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Dual Sensor vario development
Replies: 43
Views: 10877

Re: Dual Sensor vario development

Yeah I wish I could afford a Maxa or an e-Supra
by RightRudder
Tue Feb 26, 2013 8:44 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Dual Sensor vario development
Replies: 43
Views: 10877

Re: Dual Sensor vario development

They are about cdn$50.00 each! Ouch right? But they are a different breed of sensor and are quite well internally compensated against temperature and non linearities. They seem to be quite immune to 2.4GHz RF as well. Very sensitive, it can detect normal air currents in a room! This is not another v...
by RightRudder
Tue Feb 26, 2013 5:48 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Dual Sensor vario development
Replies: 43
Views: 10877

Re: Dual Sensor vario development

Actually now that you've got me thinking on this you could do it with just one differential type sensor but just hook the pitot up to the negative input port of the differential sensor! That should avoid the calibration problems but you don't have the ability to adjust the compensation. Shouldn't ne...
by RightRudder
Tue Feb 26, 2013 5:15 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Dual Sensor vario development
Replies: 43
Views: 10877

Re: Dual Sensor vario development

An airspeed indicator displays the difference between total pressure (measured at the pitot) and the local air pressure in the free stream (static pressure). The total pressure is the pressure at pressure coefficient Cp=+1. If you use an absolute type pressure sensor rather than a differential type ...
by RightRudder
Tue Feb 26, 2013 1:10 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Introduction to the openx vario/altimeter
Replies: 756
Views: 100099

Re: Introduction to the openx vario/altimeter

Very nice! Well we are still deep in snow for a while yet. I'm sure by the time I get to fly anything we will know everything there is to know!
by RightRudder
Mon Feb 25, 2013 2:36 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Introduction to the openx vario/altimeter
Replies: 756
Views: 100099

Re: Introduction to the openx vario/altimeter

Congrats Rob! I'm looking forward to your flight reports.

Joe
by RightRudder
Mon Feb 25, 2013 1:39 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Dual Sensor vario development
Replies: 43
Views: 10877

Re: Dual Sensor vario development

Yes you can read that in different ways I guess. One or two iterations doesn't seem like much to me. Dr. Drela seems to think that the probe isn't too critical for an RC glider according to what he said on another forum. These paragraphs have to be read considering competition sailplane pilots tend ...
by RightRudder
Sun Feb 24, 2013 11:41 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Dual Sensor vario development
Replies: 43
Views: 10877

Re: Dual Sensor vario development

Here's the thing. You can certainly compensate the vario by measuring airspeed and then scaling that value with a certain gain factor to tailor the response. The eagletree vario does exactly this but is not as sensitive as oXv. But what should that factor be? If you think making a probe will give yo...
by RightRudder
Sun Feb 24, 2013 11:01 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Dual Sensor vario development
Replies: 43
Views: 10877

Re: Dual Sensor vario development

Guys since Rainer got the Kalman filter working so nicely we may only have to put the openXvario in a small bottle sealed where the wires come out through the lid and also a tube. Hook the tube to a vertical cylindrical probe with a hole in the back (this is a TE probe) and presto. a 3mm aluminium t...
by RightRudder
Wed Feb 20, 2013 6:09 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Remotly controlling your vario sensitivity
Replies: 30
Views: 6664

Re: Remotly controlling your vario sensitivity

Works well for the rudder example because of the springs in the tx. The only problem I see is if I do have it on a dedicated channel like a pot and if I power up with un-intenionally my pot is at min value, while I'm distracted by something else my oXv is going to happily reprogram itself to minimum...
by RightRudder
Wed Feb 20, 2013 5:13 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Remotly controlling your vario sensitivity
Replies: 30
Views: 6664

Re: Remotly controlling your vario sensitivity

Just thought of a software solution for this rare problem without needing an arduino pin. Save two values (a 2 element FIFO). when the PPM is no longer detected save the value from the previous frame instead of the last frame.
by RightRudder
Wed Feb 20, 2013 5:07 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Remotly controlling your vario sensitivity
Replies: 30
Views: 6664

Re: openXvario development

rainer wrote:i tested that yesterday evening like 50 times and it worked each time.
You should definitely stay away from the casino! :lol: If the PPM frame is 20ms you have between 1 in 10 to 1 in 20 chance of hitting the jackpot unless I'm missing something.
by RightRudder
Wed Feb 20, 2013 4:52 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Remotly controlling your vario sensitivity
Replies: 30
Views: 6664

Re: openXvario development

Actually i´ve got it running allready here. if i disconnect the ppm connector i do get values which are outside of the range that i get when it is connected. if i connect it to ground, i get a stable 0. so we could do a 2pin female connector. one side to GND, the other one to the ppm signal on the ...
by RightRudder
Wed Feb 20, 2013 4:40 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Remotly controlling your vario sensitivity
Replies: 30
Views: 6664

Re: openXvario development

BUT: you can use the same channel as the rudder or aileron to adjust it on the ground, than disconnect the ppm signal from the openXvario to the receiver and the value get stored to the eeprom. This way you do not need a seperate channel. and as the oXv automatically adjusts itself to the limits of...
by RightRudder
Wed Feb 20, 2013 4:31 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Remotly controlling your vario sensitivity
Replies: 30
Views: 6664

Re: openXvario development

Yeah I think I'm missing something too. If the PPM signal is controlling a servo and the openxvario is reading the ppm at the same time it doesn't make sense to me. What I envisioned was using a channel like a pot to explore gain settings while flying. I could live without rudder for example on a gl...
by RightRudder
Wed Feb 20, 2013 3:27 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Remotly controlling your vario sensitivity
Replies: 30
Views: 6664

Re: openXvario development

We can do the button on the custom board but for now with the proto boards I think a jumper is the simplest solution. What's a pass through connector?
by RightRudder
Wed Feb 20, 2013 3:02 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Remotly controlling your vario sensitivity
Replies: 30
Views: 6664

Re: openXvario development

SNIP... I am currently thinking about a way to double use a channel. this would enable you to use a channel to configure the sensitivity, then disconnect the ppm signal and we would store the last value into the internal eeprom. this way it would be possible to change the sensitivity on the field, ...
by RightRudder
Mon Feb 18, 2013 3:40 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: openXvario development
Replies: 251
Views: 34670

Re: openXvario development

edit: i compared again.. its not better. the other sensor is not different in the current version of the code. i asked bertrand if it would be possible to change the audio tone to a finer stepping, The current +-10cm is to course for use :D i changed the led on the oxv to light up when reaching a v...
by RightRudder
Sun Feb 17, 2013 4:52 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: openXvario development
Replies: 251
Views: 34670

Re: openXvario development

Darn! Well thanks for the quick answer guys. I'll get the D8R and see if I can make it fit. My other option is always to build a 4m glider :D
by RightRudder
Sun Feb 17, 2013 4:19 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: openXvario development
Replies: 251
Views: 34670

Re: openXvario development

I am looking at putting an Frsky Rx in my Spectre (HK version of Passer) electric glider. There is not much room and I don't think I can fit a D8R rx. I have a D4R-II but that means I would loose a channel (need 5) I could Y the v-tail servos and use it with Ail/ele only with the 4ch rx, that's one ...

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