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Old Dec 08, 2012, 12:15 PM
X-Ikarus
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United Kingdom, North York
Joined Feb 2003
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Well done !
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Old Dec 08, 2012, 02:04 PM
Dean
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USA, CO, Littleton
Joined Apr 2005
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Agreed ^ would be totally happy with that.
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Old Dec 08, 2012, 06:23 PM
Who needs a pilot??
danstrider's Avatar
Alexandria, VA
Joined Jul 2002
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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
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Old Dec 08, 2012, 06:45 PM
X-Ikarus
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United Kingdom, North York
Joined Feb 2003
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I've had 5 or 6 flights
but still poor weather here.

No real thermals to play in yet
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Old Dec 09, 2012, 04:43 PM
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Joined Oct 2012
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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!!
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Old Dec 11, 2012, 07:50 PM
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Alexandria, VA
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Small enough?? :-)
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Old Dec 12, 2012, 05:28 AM
X-Ikarus
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United Kingdom, North York
Joined Feb 2003
1,715 Posts
Quote:
Originally Posted by danstrider View Post
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 ?
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Old Dec 12, 2012, 11:37 AM
T.ing to put on air 100 models
chiloschista's Avatar
Switzerland
Joined Feb 2008
697 Posts
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
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Old Dec 12, 2012, 12:39 PM
Stuart
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UK, Cardiff
Joined Dec 2008
3,342 Posts
Well .... if they dont supply a data sheet .......
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Old Dec 12, 2012, 05:33 PM
Who needs a pilot??
danstrider's Avatar
Alexandria, VA
Joined Jul 2002
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Quote:
Originally Posted by Reflex1 View Post
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
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Old Dec 12, 2012, 09:38 PM
Registered User
Near Kingston, Ontario, Canada
Joined Dec 2004
385 Posts
Intermittent Sound output.

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
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Old Dec 12, 2012, 09:52 PM
Who needs a pilot??
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Alexandria, VA
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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
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Old Dec 13, 2012, 10:25 AM
Registered User
Near Kingston, Ontario, Canada
Joined Dec 2004
385 Posts
Quote:
Originally Posted by danstrider View Post
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
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Old Dec 13, 2012, 02:18 PM
X-Ikarus
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United Kingdom, North York
Joined Feb 2003
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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.
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Old Dec 17, 2012, 09:23 AM
M Griffith
Ecuador, Tungurahua
Joined Jun 2012
57 Posts
Quote:
Originally Posted by kapteinkuk View Post
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.
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