Well done !

Agreed ^ would be totally happy with that.

Working to fly this tomorrow. Pretty small! That's the stock case removed in the pictures. Pretty sure that a custom board run can literally fit inside the old case. 8-D

Anyone else flown a Rolf vario?
Dan

I've had 5 or 6 flights
but still poor weather here.

No real thermals to play in yet

Very good work!! I did a similar job but with the bmp085 sensor. The sensor has a inherent noise of +-1m, so the use of it for the variometer was challenging. Anyway it was very useful to locate and center thermals, until I installed an eagletree OSD with altitude sensor.

With this impressive work and seeing how well the sensor behaves, I will build another one right now and send the sound trough the video emitter of the FPV.

Thanks for sharing it!!

Small enough?? :-)

Originally Posted by danstrider

Working to fly this tomorrow. Pretty small! That's the stock case removed in the pictures. Pretty sure that a custom board run can literally fit inside the old case. 8-D

Anyone else flown a Rolf vario?
Dan

Dan. have you flown your FrSky version, how did it go ?

Hi,

sorry for the OT, but I'm stuck.
Could someone point me toward a datasheet and connections layout for this tx please ?

What's the open blob meant for ? Maybe frequency choice ?

There is a similar free blob, seems for a capacitor, in this receiver.
What's meant for ?

Thanks,

Ric

Well .... if they dont supply a data sheet .......

Originally Posted by Reflex1

Dan. have you flown your FrSky version, how did it go ?

Haven't been able to yet (bad weather last weekend and it's practically dark after work), but I should have an opportunity on Friday or Saturday. Will post some kind of report.

Dan

Hi Everyone;

Just built up the Arduino nano and MS5611 sensor and amazed at how sensitive it is to change in height. However the audio output seems to breakup randomly which is somewhat annoying but don't see the data drop out at the input to the Arduino.. I put a scope on the output signal at D2 and for sure it does shut down randomly. I played back the video demo and noticed that it seems to do the same thing so was wondering if there is some program changes that could be made to eliminate this. It would be nice if the audio output would stay constant and only change frequency with change in altitude. Any ideas would be appreciated.

Thanks,

Dave

Looking forward to hearing how your version works!

Question for you: when you move the vario down and get the non-intermittent tone, is that what you're after for up as well? Change if (toneFreq < 0 || ddsAcc > 0) to if (toneFreq < 0) and the intermittent beeping will go away.

Traditionally, I think the intermittent sound is used to provide a clue where the zero-point is. When the tone is constant, you're sinking. When the tone begins to make intermittent beeps, you're rising. Without that, you have to memorize the zero tone. The beeping gets shorter when you start rising faster as well as the tone changing frequency. This may not be as clear in the lab.

Dan

Originally Posted by danstrider

Looking forward to hearing how your version works!

Question for you: when you move the vario down and get the non-intermittent tone, is that what you're after for up as well? Change if (toneFreq < 0 || ddsAcc > 0) to if (toneFreq < 0) and the intermittent beeping will go away.

Traditionally, I think the intermittent sound is used to provide a clue where the zero-point is. When the tone is constant, you're sinking. When the tone begins to make intermittent beeps, you're rising. Without that, you have to memorize the zero tone. The beeping gets shorter when you start rising faster as well as the tone changing frequency. This may not be as clear in the lab.

Dan

Hi Dan. Thanks for the quick reply. At first I had expected to hear a steady tone with fixed height and just get an increase/decrease in frequency with changing height but I guess that is not the case even with a real variometer. That would be my preference but may work on this later. My programing skills are pretty limited so will probably have to have a friend give me a hand. For some reason software and me don't see eye to eye. I am more of a hardware type. It will be awhile before I get to try this out as winter has set in here and I am a fair weather flier. I have yet to try out the transmitter/receiver combination but will do so in the near future. I am going to try out the cheap Chinese 433/315 units firsts to see if they will be adequate and will let you know how they work out. I will also try out the micro Arduino units as well to try and reduce overall size.

Thanks again.

Dave

You only have to memorize One tone.

Zero Sink . this will give a constant tone without interruption at a particular frequency (remember Zero Sink is actually Lift , as your no longer loosing height)
A Lower constant tone than Zero Sink means your loosing height.

A higher "interrupted tone" indicates Lift and height gain.
the faster it's interrupted the Higher the Lift.

It seems complicated at first but a little practice
and it will be second nature

That's the basics, however things are never quite that simple ....
With a Glider, Height can be converted to Speed, and Speed can be converted to Height

Elevator stick input will vary airspeed and give False Vario readings
e.g. Down Elevator increases Speed & Sink rate
so the Vario will respond appropriately with a Sink indication.

On the other hand Up Elevator on a Fast flying Glider kept above Stall speed
and the Vario will indicate Lift as the Glider converts Speed to Height.

On a simple Vario this is normal and the Pilot learns quickly
the effects of Stick inputs on Vario response.

A more sophisticated Vario also reads the Airspeed
and compensates Vario output as airspeed is varied
this is know as a Total Energy Vario. or T.E. Vario.
that I'll leave to someone else to explain,as I feel it best to learn to use a normal Vario first
before getting involved in the TE systems.

Originally Posted by kapteinkuk

Direct digital synthesizer Accumulator. It is used for the amplitude modulation of the vario sound and gives the intermittent sound when ascending.

http://en.wikipedia.org/wiki/Direct_digital_synthesizer

very clever, Thanks.