Search found 243 matches

by RightRudder
Wed Apr 12, 2017 8:28 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

I haven't downloaded the latest oXs version to see, but on www search I found this code which allows you to enter the coefficients for your own thermistor, in the last section of this page:

http://playground.arduino.cc/ComponentLib/Thermistor2
by RightRudder
Fri Apr 07, 2017 4:40 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

The elements can be epoxy coated so electrical potentials are insulated from the fuel. It doesn't need to be vertical, it can be on an angle but it needs to cover the vertical distance from max to min fuel. This approach avoids the problems you mentioned with external plates and tank sizes, proximit...
by RightRudder
Fri Apr 07, 2017 12:57 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

I have a commercial fuel level sensor which works based on the capacitance effect. In this case they have arranged for the capacitor plates to take the form of a rod running inside a hollow tube. At the top, the two are separated and fixed with insulating epoxy. The tube has a small hole on the side...
by RightRudder
Thu Apr 06, 2017 3:14 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

Very cool idea Joao. Does it work with non polar fluids like perol?
by RightRudder
Wed Mar 01, 2017 6:48 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

I just made my first transaction about a month ago with Aliexpress to get my GY-86's. My friend did three transactions with them in 2016 and each time afterward he got a call from the credit card company that his card was compromised. That's 3 for 3. I still have my fingers crossed!
by RightRudder
Wed Mar 01, 2017 4:35 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

My concern is that simply using voltage dividers results in very marginal logic levels for the arduino input side and not much room for any noise.
by RightRudder
Tue Feb 28, 2017 1:40 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

I would like to emphasize that as well. Mstrens is working very hard for us and I hope he knows it is so appreciated. It is always more satisfying when you use something you have crafted with your own hands, but for me I am continuously amazed by the example of the openRC community and see how in ot...
by RightRudder
Mon Feb 27, 2017 5:40 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

Speaking of stability, when I made my boards I included an RF filter on the line which goes to the analog reference for the A/D converters in the Atmega328. It is a good idea considering the oXs is in close proximity to the transmitter from the model's RX.
by RightRudder
Mon Feb 27, 2017 5:27 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

I think you might be getting the confusing beeps because in climbing the steps you actually produce accelerations in both directions and the accelerometers can easily detect this but depending on the latency of the sampling and telemetry stream the vario audio routines in the TX dont always see it. ...
by RightRudder
Mon Feb 27, 2017 2:15 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

The Int pin on the accelerometer has to connect to oXs and you have a choice between digital pin 2 or 3 as described in the config.h and config description.h. If you are going to the trouble of doing a layout and adding resistors etc you might as well just drop a dual mosfet package on and do the le...
by RightRudder
Wed Feb 22, 2017 10:26 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

Nice job Joao

It is nice to have everything on one little board sometimes. I did something similar except I didn't want to attach a GY-63 so I put the sensor on my board as well. I got fed up with etching boards and making my own vias years ago though so I send them out.
by RightRudder
Sat Feb 18, 2017 12:41 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 54830

Re: GPS sensor

The thing that attracted me was the fact that the RTK processing is done right on the GPS. Others have done it with raspberry pi talking to a receiver that can output carrier phase information and you can do it that way for less money but it gets a bit bulky for a model aircraft.
by RightRudder
Sat Feb 18, 2017 1:49 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 54830

Re: GPS sensor

Actually I got a little excited when I heard about this tech, but now that I have read a little deeper and seen the reports of early adopters of this receiver it seems the claims made by the folks at ublox about cm level accuracy are a little optimistic. Under ideal sky conditions and with very good...
by RightRudder
Fri Feb 17, 2017 7:20 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 54830

Re: GPS sensor

When you consider that differential GPS used to cost $10k each, a development board for $250 is already cheap! But I expect these will be $10 GPS in a couple of years, if not sooner. Even at today's price it has applications that can easily justify the cost.
by RightRudder
Fri Feb 17, 2017 4:36 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 54830

Re: GPS sensor

Any chance we could get support for the ublox NEO-M8P GPS with openXsensor? I have been looking at the data sheet and this one has a RTK engine onboard! It also supports high baud rates or can go on the I2C interface. Expensive today, but in time the price will drop. I would like to put a pair of th...
by RightRudder
Thu Feb 02, 2017 1:57 pm
Forum: Turnigy 9XR PRO radio
Topic: M9 Hall effect gimbals
Replies: 27
Views: 6627

Re: M9 Hall effect gimbals

andrewju wrote:I was thinking about it, too. Losing 30% of resolution isn't an option at all, in my opinion. So 9x users will have to use opamps between the sensors and the mainboard.
DC amplifiers introduce new problems such as temperature and offset drift. I would not do this.
by RightRudder
Tue Jan 31, 2017 3:09 pm
Forum: 9Xtreme upgrade board
Topic: New Frsky Hall Effect Gimbals
Replies: 15
Views: 5432

Re: New Frsky Hall Effect Gimbals

Does anybody know the thread on these sticks? Is it M3?

Edit: The second review says they are 3mm.
by RightRudder
Mon Jan 30, 2017 1:48 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

João[/quote] Just to get you guys know that I have just tested this on the breadboard and it worked. I have flashed the oXs hex file generated by the IDE using the 1 wire bootloader.. It is very fast flashing as well. The only thing is that whatever is connected to digital pin 8 must be disconnected...
by RightRudder
Fri Jan 27, 2017 9:31 pm
Forum: 9Xtreme upgrade board
Topic: New Frsky Hall Effect Gimbals
Replies: 15
Views: 5432

Re: New Frsky Hall Effect Gimbals

Does anybody know if the X12 gimbal frames will fit in Taranis? I'm glad the M9 gimbals will work in both my Taranis and 9X (with Sky board) but the X12 gimbals seem a bit better made with all metal frames.
by RightRudder
Fri Jan 27, 2017 1:33 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

The device on the link that I posted gives a linear output over a 1000 deg.C range and wouldn't require anything different than the type of code used for the current sensor. Probably could even use that code and just rescale the units in TX? This link has better information: https://www.adafruit.com...
by RightRudder
Thu Jan 26, 2017 9:00 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

Here you go thermocouple interface with analog out. Connect to Ain and scale the result to 5mV/deg c

http://www.ebay.co.uk/itm/Precision-AD8 ... 2294350586
by RightRudder
Thu Jan 26, 2017 7:59 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

Maxim has some very nice cold junction compensated thermocouple interface IC's that use I2C to connect to uP. Very easy to use. I can't remember the part number right now but I have used them. They are accurate and easy to use.
by RightRudder
Thu Jan 26, 2017 5:24 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

I assume you mean NTC thermistor? Why wouldn't you just use an LM35? it's only 1 extra wire and way easier to use.
by RightRudder
Thu Jan 26, 2017 3:18 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

Ahh. So the "1 wire" is a bit misleading. They are combining the RX/TX onto a single digital pin, but the device still needs to be powered for programming, so you need 3 wires in reality. It is a nice trick though. I always make sure the heat shrink has a small cut on each side of the board so I can...
by RightRudder
Thu Jan 26, 2017 2:15 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

I did not know there was a DIY Frsky_RX! I had heard about 1 wire programming but assumed that was something that was for another technology, not ATMEGA328 IC's. Clearly I am not able to keep up with the pace of things anymore. So this requires a different bootloader obviously. What about power? Doe...
by RightRudder
Thu Jan 26, 2017 1:34 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

I just think that a m328 is a waste of a good processor when you just need 2 or 3 pins out of 32 :( I could use it on another receiver instead.. :) João But I'm interested in knowing how to program the chips off board anyway :D Thank you I agree but the chips are not expensive like in the old days....
by RightRudder
Thu Jan 26, 2017 12:25 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

@Joao: If you are going to make custom boards the 328 is pretty small. You can place it on the opposite side as the divider resistors and have something pretty tiny especially if you don't add a ICSP programming header. I can advise you how to program the chips off board if you want to go that way.
by RightRudder
Wed Jan 25, 2017 9:34 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

Also the oxs_config_description file has grown and contains much information including the circuit diagram example you are looking for
by RightRudder
Wed Jan 25, 2017 9:32 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New beta version of openXsensor (=openXvario)
Replies: 455
Views: 57332

Re: New beta version of openXsensor (=openXvario)

As far as I know the code size mainly depends on the defined features. If you only define a voltage sensor the compiler output should be quite small. Try it!

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