Search found 70 matches

by Tempo
Wed Jul 30, 2014 4:36 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Airspeed sensor for openXsensor
Replies: 6
Views: 2441

Re: Airspeed sensor for openXsensor

@mstrens you develop openXsensor enhancement for differential pressure sensor MS4525DO, is that right ? I integrated TEK-probe in thermal flying machines and it is very easy to add simple Pitot-tube (without static source). TEK-probe gives pressure = p - q Pitot-tube gives pressure = p + q You get d...
by Tempo
Wed Jul 30, 2014 3:57 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Airspeed sensor for openXsensor
Replies: 6
Views: 2441

Airspeed sensor for openXsensor

Let´s concentrate information and discussion to this topic airspeed sensor for openXsensor.

You will find previous debate there
viewtopic.php?f=48&t=5632
and there
viewtopic.php?f=86&t=5920
and elsewhere ...
by Tempo
Tue Jul 29, 2014 2:03 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Variometer quality check
Replies: 17
Views: 2409

Re: Variometer quality check

... Sorry but I do not understand german and the google traduction from the link you provided is very bad. So if you really want, I can try to better understand but currently I did not. ... Yes, this is with german text, but I mean diagrams universal speach ;) Your remarks above are as excellent as...
by Tempo
Tue Jul 29, 2014 11:04 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Variometer quality check
Replies: 17
Views: 2409

Re: Variometer quality check

@mstrens I own wstech-data-vario and openXsensor, but no FrSky-FVAS-02H. Comparison openXsensor_r220 and FrSky-FVAS-02H see there: http://fpv-community.de/showthread.php?50114-FrSky-Taranis-und-Variometer-openxvario-bzw-openxsensor&p=653372&viewfull=1#post653372 ==================================== ...
by Tempo
Mon Jul 28, 2014 4:43 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Variometer quality check
Replies: 17
Views: 2409

Re: Variometer quality check

@mstrens Yes, you are right. But this topic is Variometer quality check. Remeber also, change of atmospheric pressure during flight is more important than temperature drift of sensor. In this case better use GPS for altitude measurement. Measurement of airspeed with two different drifting MS5611 is ...
by Tempo
Mon Jul 28, 2014 12:52 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Variometer quality check
Replies: 17
Views: 2409

Temperature drift MS5611

MS5611 temperature drift is not a real problem, because drift in altitude causes constant vertical speed about 1/10 smaller than vertical speed noise of sensor.
You can see it on picture above as small and constant shift of zero point in vertical speed.
It´s insignificant for climbrates.
by Tempo
Sun Jul 27, 2014 11:56 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Variometer quality check
Replies: 17
Views: 2409

openXsensor_r220 vice wstech_linkvario

========================================================== summary: openXsensor_r220 (default values in oxs_config.h) vertical speed noise about +-0,07m/s reaction time about 1s altitude drift about +0,01m/s wstech_linkvario vertical speed noise about +-0,04m/s reaction time about 5s ==============...
by Tempo
Sun Jul 27, 2014 10:02 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Variometer quality check
Replies: 17
Views: 2409

Variometer quality check

Let´s compare openXvariometer with other variometers like FrSky-FVAS-02H, wstech, ... Make "stairways-test" and analyse data. I will give you an example with openXvario_rev220 and wstech-datavario. Definitions: vertical speed = vs = unit is meter per seconds vertical speed noise = vs_n = variometer ...
by Tempo
Sun Jul 27, 2014 7:42 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: TEK Probe and pressure connection
Replies: 8
Views: 5265

Protect MS5611 of light

Sensor MS5611 is sensitiv to light. Protect for example with black shrink tube.
2014_openXsensor_Lichteinfluß.JPG
by Tempo
Sat Jul 26, 2014 10:39 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Who wants to build and sell varios for a french company?
Replies: 64
Views: 6002

Re: Who wants to build and sell varios for a french company?

I prefer Teensy 2.0 instead of Arduino pro mini for openXsensor: http://www.pjrc.com/teensy/index.html Teensy.gif @Tempo, Except the USB connector, why do you prefer the Teensy 2.0.? I do not think that the chip (32U4) is so different from the (328P) from the arduino pro mini and it cost about 5 X ...
by Tempo
Sat Jul 26, 2014 9:12 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Who wants to build and sell varios for a french company?
Replies: 64
Views: 6002

Re: Who wants to build and sell varios for a french company?

... If a complete new board is developped, would it not be better to consider another CPU like the one used in the Tensy. I think it has 3 UART. Further more, we slowly reach the limit of the 32k program memory from the 328p when all current options are activated (and being in debug mode). But I th...
by Tempo
Sat Jul 26, 2014 8:25 am
Forum: The Pickled Gnu (The Pub)
Topic: Open source speed sensor?
Replies: 77
Views: 15069

Re: Open source speed sensor?

Hallo Carbo, bei deinen TEK-Düsenbildern fällt mir folgendes auf: ... Tempo, Thanks for all the practical explanations. I used google to get a translation to english. I understand the main part but the automatic translation is not always good. If you have time, I think it would be good writing a tr...
by Tempo
Sat Jul 26, 2014 6:50 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: TEK Probe and pressure connection
Replies: 8
Views: 5265

Ready for thermal hunting ?

T otal E nergy K ompensation = you will only detect rising air or falling air. Learn more about and read TEK-Probe_english.pdf 2014_openXsensor_TEK_Braunschweigerdüse.JPG Firstly built housing for sensor MS5611 : GY-63_PCB.JPG 2014_openXsensor_TEK_Anschluß.jpg Seal with slowly setting epoxy. Compou...
by Tempo
Thu Jul 17, 2014 7:34 pm
Forum: General RC Electronic Projects and Discussion
Topic: X8R: 3.3V or 5V tolerant
Replies: 5
Views: 1529

Re: X8R: 3.3V or 5V tolerant

Have a look on datasheet of processor for X8R: http://www.st.com/web/en/resource/technical/document/datasheet/CD00161566.pdf You find: ... Clock, reset and supply management – 2.0 to 3.6 V application supply and I/Os 2 x 12-bit, 1 μs A/D converters (up to 16 channels) – Conversion range: 0 to 3.6 V ...
by Tempo
Thu Jul 17, 2014 5:01 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: OpenXsensor Configurator
Replies: 195
Views: 35359

Re: OpenXsensor Configurator

Very good idea ! Keep up the good work !
by Tempo
Mon Jul 14, 2014 7:32 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: TEK Probe and pressure connection
Replies: 8
Views: 5265

Re: TEK Probe and pressure connection

... And here is the result, an overcompensated TEK. You can adjust it down for exact compensation by reducing the outlet with some tape (easy), or reducing the outside diameter of the washer (not so easy). First testflight with rain and vario sound Cheers Carbo Your video shows mounted filament. It...
by Tempo
Mon Jul 14, 2014 3:41 pm
Forum: The Pickled Gnu (The Pub)
Topic: Open source speed sensor?
Replies: 77
Views: 15069

Re: Open source speed sensor?

Further informations on TEK-pipes:

viewtopic.php?f=86&t=5856
by Tempo
Mon Jul 14, 2014 3:35 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: TEK Probe and pressure connection
Replies: 8
Views: 5265

What you had to know about TEK-compensation

This is a good source for understanding how pipes work and how to trim pipes:
TEK-Duese_deutsch.pdf
(100.61 KiB) Downloaded 260 times
TEK-Probe_english.pdf
(84.05 KiB) Downloaded 239 times
by Tempo
Mon Jul 14, 2014 3:29 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: TEK Probe and pressure connection
Replies: 8
Views: 5265

Re: TEK Probe and pressure connection

@Carbo Good idea to use gold socket and washer for "Braunschweiger Düse" 8-) Your new horizontal tube connection on MS5611 allows a new feature: Mount openxsensor inside vertical tail and you receive short tube connection to TEK-pipe at top end of vertical tail. That´s best position for pipes outsid...
by Tempo
Sat Jul 12, 2014 3:54 pm
Forum: The Pickled Gnu (The Pub)
Topic: Open source speed sensor?
Replies: 77
Views: 15069

Re: Open source speed sensor?

Hallo Carbo, bei deinen TEK-Düsenbildern fällt mir folgendes auf: Die Nicksdüse im ersten Bild hat eine etwas zu große Bohrung für die Druckabnahme. Versuche sie mit etwa 0,5 mm Bohrungen zu machen. Zu große Bohrungen produzieren ihrerseits wieder unerwünschte Umströmungen am Düsenrohr. Vermutlich h...
by Tempo
Thu Jul 10, 2014 3:20 pm
Forum: FrSky Taranis radio
Topic: Taranis - speaker buzz
Replies: 132
Views: 24774

Re: Taranis - speaker buzz

I think this is ultimative solution for dirty audio signals on Taranis Rev.B :
http://www.rcgroups.com/forums/showpost ... count=2031

You get 3 solutions:
(a) better output for earphones
(b) filter for RF buzz and alternative connections of loudspeaker on PCB
(c) filter for click
by Tempo
Wed Jul 09, 2014 6:10 pm
Forum: The Pickled Gnu (The Pub)
Topic: Open source speed sensor?
Replies: 77
Views: 15069

Re: Open source speed sensor?

@mstrens Yes, for yaw angle detection you only need 3 holes. In this way my control loop actuates rudder. But I also detect nick angle as angle of attack. This is another option to measure velocity, because velocity is also a function of nick angle for a defined aeroplane ! ;) In future I will contr...
by Tempo
Wed Jul 09, 2014 4:43 pm
Forum: The Pickled Gnu (The Pub)
Topic: Open source speed sensor?
Replies: 77
Views: 15069

Precission measurement of velocity

@mstrens In picture above and below you see RC-model of my own (wingspan 3,3m F3J-glider) "Wirbelzähler" fitted in picture above. Yes, I use a micro with analog circuit (frequency-filters and amplifier with dynamic compressor) designed for my "Wirbelzähler". Velocity is calculated by an optimized fo...
by Tempo
Wed Jul 09, 2014 1:54 pm
Forum: The Pickled Gnu (The Pub)
Topic: Open source speed sensor?
Replies: 77
Views: 15069

Precission measurement of velocity

I think a wind tunnel would be a nice tool to have at the moment :) João Better than wind tunnel is a "flying wind tunnel" like this 8-) : 2013_08_01_Schuß_FHT_HS_Foto.jpg At top end you spot a yellow flag, which detects angle of attack. In this example only one direction of flow is measured, but i...
by Tempo
Wed Jul 09, 2014 1:18 pm
Forum: The Pickled Gnu (The Pub)
Topic: Open source speed sensor?
Replies: 77
Views: 15069

meassurement of pressure for velocity, altitude and TEK

... You say that it is difficult to get a good static pressure. I expect it is so if you use the static pressure inside the fuselage (combined with just a normal Pitot probe for the dynamic pressure). But do you think that it is difficult to get correct airspeed values when using a Prandtl probe se...
by Tempo
Wed Jul 09, 2014 12:31 pm
Forum: The Pickled Gnu (The Pub)
Topic: Open source speed sensor?
Replies: 77
Views: 15069

Re: Speed sensor for low velocity

(2) I use another measurement principle for measuring low aerodynamic speed: thermal-flow-sensor. I use this sensor-family : Sensirion_Differential_Pressure_SDP600series_Datasheet_V1.7.pdf. ... Where do find the sensor you are using? I had a look on Google but I do not find a web supplier? At Farne...

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