openrcforums

Good evening everyone, I have a couple of really simple questions: I assume the hardware build for the SPORT version is identical to the build on the wiki for OpenXVario? Would I be right in assuming I don't need the receiver RX pin connection, but will simply connect the receiver plug into the sPO...

Mike, I can update my glider's sensor to the latest version and see if the problem still happens. I have an older version.. i think it is a good idea.. Maybe the problem was already fixed, maybe not.. we will find out.. Now where was that GUI for the openXsensor again?? :) :) The best way is to tes...

Carbo, Thanks for the feedback. I think then when you use a TEK probe, it is not possible anymore to calculate the airspeed afterwards. Looking to you new log file, I notice again a drift between the altidudes reported by the 2 MS5611 (if we can assume that there was no wind at the beginning and at ...

Some times every few seconds, sometimes after 3 minutes, sometimes after 2.. it is not at the same interval.. Then it can't be the timer overflow because it should be regular. My main problem is the voltage reading as it announces an empty battery and telemetry loss when in fact there is none.. Do ...

When operating in 'HUB' mode, it seems the openXsensor may not be sending data as often as required. ersky9x has a 900mS timeout for receiving 'user data' and from some recent testing of the new 'voice alarms' there have been occasions where a voice alarm has occured due to no telemetry data. I add...

Yes, in openxsensor.ino you defined it. I dont know, if the code allows to change it on the fly. Also only the starting sensor is zeroed, so it possibly does not make sense, you wuld switch the altitude sensor too. #ifdef VARIO #ifdef DEBUG OXS_MS5611 oxs_MS5611(I2CAdd - 1,Serial); #else OXS_MS5611...

Meanwhile i changed the sensor-IDs in the arduino sketch and mounted a TEK-Probe to fly with dTE. The result was not as expected, when i flew loops and downturns. Only for a short period i noticed the influence of the TEK, then the vario behaved as usual. After the landing i checked the sensor: the...

Hi Michael, the weatherforecast was right, so here is a flight with a speed-probe on a second MS5611, logged as T1. GPS was on board for comparison purposes. Hi Carbo, Thanks for the log. I had a look at it. There is clearly a bug somewhere in XOS because Temp1 becomes negative whenthe value increa...

If I remember wel one user claiming about the jump was using a X8R receiver (and so SPORT protocol).
Let see if you can reproduce it.

davx wrote: Just one thing, I'd like to get 1 decimal after the point but it must be on the OpenTX side I guess ?

Yes, Frsky telemetry protocol does not transmit digital (only integer) so formatting has to done on Tx side.
On OXS you only can apply some multiplier/divider that in some cases can help.

@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 calculat...

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 measu...

Ok, installed it in c:\oXs and now it generates the config.h file but it crashes if I try to insert some values on the voltages menu.. As I understand we insert the max voltage and the value for R1, and the program computes R2?? Or we insert the resistor values and the program calculates the max vo...

It doesn't work for me. I put it in c:\oXs but i get the following error: "Cannot download the application. The application is missing required files. Contact application vendor for assistance" I have win7 64 bit João Perhaps I have to provide additional files too. When I generate the app...

Hi, I'm progressing with my temp sensor integration and while doing so, I wondered if the files oxs_arduino.h and oxs_arduino.cpp could not be renamed as oxs_voltage.x because that's all they are doing, measuring voltages ;) You are right. Those were the name of the file when I started working on t...

I think a GUI, or a configuration wizard would be a good thing now that it has so many options ;) João I just made a configuration wizard. I am currently starting with some tests. It has been developped using Microsoft visual basic 2010 express on a pc running windows 7. If you want to test it, i a...

@ mstrens, after many attempts, I ask again. I have built the same device again and this time I want to run it with a D8R-II plus receiver. Vario and altimeter is o.k. but I get no voltage output. Maybe you can help me again. Hans I presume you are using the latest version of OXS available on googl...

(1) Using one MS5611 for TEK-variometer and a second MS5611 for altitude: It´s only interesting for high speed. By low speed-thermal-circling with TEK the difference to an extra altitude sensor without TEK is low. Changes in weather/atmospheric pressure during flying make more differences in altitu...

Carbo, I am not so optimistic as you. The accuracy of MS5611 is much less than 0.1 m. If you look at your log (see previous post), you will see that the sensor filling the altitude has a drift of about 75 cm in a few min. The second sensor has not the same drift (about 47 cm based on T1). Using the ...

Before making all those changes to OXS, I would like to check if the results would be acceptable. So, I would like to perform the calculation in XLS based on the telemetry data logged by Taranis on the SD card. Can you make some tests (real fly) in neutral air (no lift, no sink) where you increase/d...

so, now this second sensor will only read the pressure (altitude) to give the speed? João Currently the sencond sensor performs exactly the same calculations as the first one. This allows : - to make tests to compare 2 sensors - to connect one sensor to a TEK probe, using this sensor to get a (pneu...

Fine that it seems to work from the first try. Let me know the results of your tests. If OK, I can publish this code on Google. After you try with a TEK probe, you could make some tests with a normal pitot probe running at some fix speed with a car and logging the data. If the data are reliable we c...

I understand better the MS5611 drifting now and I'd like to compare myself the temperature from the MS5611 and my temp sensor, how do I get this value ? Davx, The temperature from the MS5611 is calculated by this instruction in oxs_ms5611.cpp TEMP = (2000 + (((int64_t)dT * (int64_t)_calibrationData...

Yes, I've already read oxs_config.h but if you look at the code I've posted, there is a compensation error calculation and I don't think I could use it with the current OXS code. By the way, this temp sensor should have a 0.5°C precision so perhaps it could be used to compensate the drifting of the...

Carbo, please find in attachment a version of OXS that you can use in order to test 2 MS5611 connected to an Arduino OXS. To activate the second MS5611, you must leave the line "#define VARIO2" uncommented (in the config.h file). You can then add lines to define which fields are transmitte...

It feels to me that the issue you are seeing is a poor GPS lock, coupled to a possibility that your various height is using the GPS data as the source. Just a guess :) This gives no explanation to the vario jumps. I think that other users also reported some vario jumps (also when using an openXsens...

Hi, Now, I'm playing with a MCP9700A temperature sensor and I'd like to integrate it in OXS, I've come up with this code, which I've tested on an arduino UNO: I had a very short look at MCP9700A datasheet. It seems that it provides an analog voltage based on the temperature. If it is really so, the...

Hi Michael - that was fast! - if the two ms5611 drift in the same direction - the fault will compensate. mounting them together (same temperature) will help - i "stole" an idea, sticking an preformed heatschrink tube on one side to the sensor, on the other side to the tube. So the small b...

In openxsensor we have routines for measuring altitude with 0,1 m resolution. Why not use this routines with a second ms5611 sensor (two i2c adresses are possible) that is connected to a probe? The speed can be calculated with the delta altitude: V=sqrt(2gh). The energy of 10 m/s correspond to a de...

Thomas9x, Thanks for the information about the Vector's airspeed sensor. Still I expect that a solution around the 4525DO-DS5AI001DP would be better because: - the ADC is build in the sensor and so the sensor should have less noise - the sensor should be more sensitive because ADC is 14 bits (instea...