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.

Dennis, would it be possible to use a variable resistor for R1 and R2?

Originally Posted by rimshotcopter

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.

Originally Posted by Dennis Frie

Changing to CUR and VLT again takes a few minutes - it was mainly a test

UR the man Thanks

Originally Posted by Dennis Frie

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.

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)

Originally Posted by Dennis Frie

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

Originally Posted by vipix

We need RTH

And dont forget the fullblown IMU.

Originally Posted by vipix

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".

Originally Posted by LKJ

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

Dennis, in your opinion, how difficult would it be to add an horizon bar to the display?

Originally Posted by rimshotcopter

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

thank you, I am going to start building today.

Originally Posted by rimshotcopter

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

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...

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)