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Old Sep 11, 2011, 06:46 PM
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I received a PM regarding the latest schematic, and realized it's not very clear. This is the values I use at the moment. Please note that the schematic posted a while ago has R3 and R4 mixed up - my mistake, sorry guys.



It's the same schematic as shown on page 1 since the beginning of this thread - only the dimming resistor have been added and SPI-resistor have been made smaller to "match" the dimming.
Last edited by Dennis Frie; Sep 11, 2011 at 06:52 PM.
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Old Sep 11, 2011, 07:05 PM
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Dennis, would it be possible to use a variable resistor for R1 and R2?
Old Sep 11, 2011, 07:09 PM
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Originally Posted by rimshotcopter View Post
Dennis, would it be possible to use a variable resistor for R1 and R2?
No problem at all
But they should off course be pretty accurate around 100 ohm - I guess something like 200 - 400 ohm pot will do fine.
Old Sep 11, 2011, 07:16 PM
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Originally Posted by Dennis Frie View Post
Changing to CUR and VLT again takes a few minutes - it was mainly a test
UR the man Thanks
Old Sep 11, 2011, 07:45 PM
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Originally Posted by Dennis Frie View Post
No problem at all
But they should off course be pretty accurate around 100 ohm - I guess something like 200 - 400 ohm pot will do fine.
Thank you.
Old Sep 11, 2011, 10:46 PM
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Guess this will be one of the last updates - unless anyone find bugs or have ideas for improvements
  • Start-up screen added. Shows number of satellites, sat-fix, delay (from sat-fix to set-home) and the time (this can be used to check if the gps update-rate is right)
  • Possible to hide GPS-coordinates if altitude > x (but can be set to show every x second anyway)
Last edited by Dennis Frie; Sep 11, 2011 at 10:59 PM.
Old Sep 12, 2011, 10:56 AM
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Originally Posted by Dennis Frie View Post
Guess this will be one of the last updates - unless anyone find bugs or have ideas for improvements
  • Start-up screen added. Shows number of satellites, sat-fix, delay (from sat-fix to set-home) and the time (this can be used to check if the gps update-rate is right)
  • Possible to hide GPS-coordinates if altitude > x (but can be set to show every x second anyway)
We need RTH
Old Sep 12, 2011, 11:10 AM
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We need RTH
And dont forget the fullblown IMU.
Old Sep 12, 2011, 03:40 PM
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We need RTH
It would be great if everything could be implemented on one microcontroller - but the controller is already pretty busy
Main problem is, that interrupt can't be used as they will disturb/interrupt the OSD (very easy to see).

It might be possible to use the hardware-controlled PWM output's to control a couple of servos without using interrupts, but you still have to read the servo-inputs as well.

While it might be possible I have to admit - I like the KISS concept
I prefer to have all my servos etc. connected directly to my receiver, but it would be fun to "play with".

Quote:
Originally Posted by LKJ View Post
And dont forget the fullblown IMU.
Year I know I talked about it a while ago
I have found 3 axis gyro and accelerometer that costs around 15 $ total. This would make a dead cheap IMU. Guess this could be a fun winter-project, but I don't have any plans to make it official. I believe projects like ArduPilot is a better choice, if you don't want to code yourself
Old Sep 12, 2011, 03:47 PM
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Dennis, in your opinion, how difficult would it be to add an horizon bar to the display?
Old Sep 12, 2011, 03:57 PM
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Dennis, in your opinion, how difficult would it be to add an horizon bar to the display?
It should be possible with a bit of code-work, and not too difficult to implement.

You can use a 2-axis accelerometer and the summary-lines to show the artificial horizon. Something like this will keep the start-up screen and summary:
(if homepos == 1 && landed == 0) {
Put artificial horizon code here
}

Then you just have to draw a fancy artificial horizon
Old Sep 12, 2011, 04:00 PM
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thank you, I am going to start building today.
Old Sep 12, 2011, 04:02 PM
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thank you, I am going to start building today.
Sounds great
Please post a picture or two when you get the OSD up and running, always great to see
Old Sep 13, 2011, 02:21 AM
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RTH can be done with another arduino board.
If you made this OSD so good, so you can easelly make RTH, for you - no problems

GPS info from OSD GPS, only one thing is required...
Old Sep 13, 2011, 08:54 AM
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Another test done. My quad was a little erratic due to unmatched esc's, but flyable.

Code 12 was used, unfortunately I forgot to define alt offset and flight summary. But Gps and current sensor were working well.

DIYOSDCODE12.mp4 (2 min 11 sec)


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