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Old Sep 24, 2011, 09:53 PM
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Originally Posted by msev View Post
Anybody tried the gps on this site: http://ohararp.com/products.html

10Hz refresh rate for 25$ not bad ..
You can always get one from DIY Drones for $35 with the breakout board and cable.
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Old Sep 25, 2011, 06:30 AM
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looks like this osd suffers from the same problem than simpleOSD XL
characters are always dancing, never rock solid like they are for example on DragonOSD or RVOSD....

no way to make them stable?
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Old Sep 25, 2011, 08:38 AM
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Originally Posted by wallaguest1 View Post
looks like this osd suffers from the same problem than simpleOSD XL
characters are always dancing, never rock solid like they are for example on DragonOSD or RVOSD....

no way to make them stable?
In my limited experimentation, that dancing is caused but voltage variances and heat from the components. I think what is needed is really good voltage regulator at the 5 volt input to the circuit.
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Old Sep 25, 2011, 09:15 AM
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Quote:
Originally Posted by wallaguest1 View Post
looks like this osd suffers from the same problem than simpleOSD XL
characters are always dancing, never rock solid like they are for example on DragonOSD or RVOSD....

no way to make them stable?
Have you tried the hardware/schematic in this thread?
You should be able to get very solid characters. With the DIY hardware I have been able to get perfect sync.

I will maybe upload a video later with a better recorder.
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Old Sep 25, 2011, 09:18 AM
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Originally Posted by rimshotcopter View Post
In my limited experimentation, that dancing is caused but voltage variances and heat from the components. I think what is needed is really good voltage regulator at the 5 volt input to the circuit.
The supply-voltage shouldn't have any major influence on the sync-detection. The reference-voltage is generated by a diode with the same voltage-drop independent of the input voltage.
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Old Sep 25, 2011, 09:24 AM
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Originally Posted by Dennis Frie View Post
The supply-voltage shouldn't have any major influence on the sync-detection. The reference-voltage is generated by a diode with the same voltage-drop independent of the input voltage.
Interesting, reason I say this is, I have built two now and there is a huge difference in the lettering quality depending upon the power source. The newest build, I am using a 5 volt source from duemilanove and getting near perfect video snyc however, it will deteriorate (not much) over time.

I will attempt to do a time-lapse recording today however, even with the minor deterioration, I am a very HAPPY CAMPER.
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Old Sep 25, 2011, 09:37 AM
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QuadGPS.mp4 (3 min 45 sec)


Skip to 2:00 for the good stuff. Still using the 38400 gps. No dancing here. My groundstation is inside with omni antenna only.
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Old Sep 25, 2011, 11:21 AM
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mrfliboy thats what you call a "no dancing" osd ? it never stop dance to my eyes.
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Old Sep 25, 2011, 12:26 PM
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It's most likely the fact that he's transmitting on a wireless video transmitter that's making it "dance," not the OSD itself. That you can't do much about.
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Old Sep 25, 2011, 12:51 PM
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Originally Posted by healthyfatboy View Post
It's most likely the fact that he's transmitting on a wireless video transmitter that's making it "dance," not the OSD itself. That you can't do much about.
Yes thats the wireless link, not the osd itself. The OSD is very solid IMO
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Old Sep 26, 2011, 08:58 AM
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Originally Posted by Sleurhutje View Post
Starting to build mine tonight. Got all the big parts, the small parts are somewhere around. Using a Arduino Mini v4 instead of a Pro but it's also 16MHz, only 16kB of memory but that should do fine (does it?).

Only have to find my compiler.


Hello, Sleurhutje
It was possible to you to make teamwork GPS em-411 and arduino?

Question for all:
With the help of what program to stitch Arduino (.txt a file)?

I have program AVR studio or Algorithm builder, it works with .hex a file
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Old Sep 26, 2011, 09:08 AM
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HI..

I wonder if diy-OSD could be used for a ROV ???

AuzzeMit
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Old Sep 26, 2011, 03:02 PM
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Hi Dennis,
I've built the Diy osd with your original diagram and is working well but not yet tested in flight, I will test soon, BTW i'd like to built also an OSD using LM1881 changing some pins in the sketch.
My question is VSYN out and SYN out how are connected to Int0 and Int1 pins ?
I want see the difference using arduino voltage comparator or using synchro separator with LM1881.
Thanks
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Old Sep 26, 2011, 03:15 PM
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[QUOTE=alex57russ;19424495

Question for all:
With the help of what program to stitch Arduino (.txt a file)?

I have program AVR studio or Algorithm builder, it works with .hex a file[/QUOTE]




http://arduino.cc/en/Main/Software

and change the ext. from .txt to .pde
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Old Sep 26, 2011, 05:42 PM
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Quote:
Originally Posted by mrfliboy View Post
Yes thats the wireless link, not the osd itself. The OSD is very solid IMO
When I get time I will upload a clip as well, my new video-grabber is a lot better than my previously USB grabber. It should show pretty solid characters

Quote:
Originally Posted by AuzzeMit View Post
HI..

I wonder if diy-OSD could be used for a ROV ???

AuzzeMit
The OSD doesn't really care if you mount it in a sub, a car or a plane (as long as you keep it dry )

But it will probably be difficult to find a GPS working under water. Also, the heading is calculated from the movement, so you have to move a couple of km/h to get a good reading.

Quote:
Originally Posted by carlonb View Post
Hi Dennis,
I've built the Diy osd with your original diagram and is working well but not yet tested in flight, I will test soon, BTW i'd like to built also an OSD using LM1881 changing some pins in the sketch.
My question is VSYN out and SYN out how are connected to Int0 and Int1 pins ?
I want see the difference using arduino voltage comparator or using synchro separator with LM1881.
Thanks
When using LM1881 you just have to choose the controller SimpleOSD OPEN. Only difference is the use of the LM1881 synch detector. Atmega 328p only supports interrupts on digital pin 2 and 3 - so you will have to use these pins.
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