Originally Posted by Dennis Frie

That's great
You might want to add the dimming-resistor as well. The dimming makes it a lot easier to read the text on a bright sky etc. You can always turn it off in the software if you don't like it.

Where do i add that?

Just went quickly through the thread, I figured it would be fun to collect a few images from peoples build

Originally Posted by p3jpaavi

Where do i add that?

In this schematic it's the resistor called R2. You just connect the video to pin 8 through a resistor. The resistor value can be changed to adjust how dark a background you want.

Just got mine up and running on a bread board last night! Just need to etch a PCB and I'll be good to go for testing it out in flight this weekend! Here's a pic of what I have so far. My GPS runs off of 3.3v so I threw in a voltage regulator and a logic level converter from Sparkfun.

Thanks for the great project Dennis! You're awesome!

hi,

anybody an idea what is going wrong here? i built the osd on a breadboard and on a circuit board but the output is exactly the same. i took the same values for the parts as in post #1.

Looks like you need to give the variable resistor a twiddle

Great to see guys

Originally Posted by JayPi

hi,

anybody an idea what is going wrong here? i built the osd on a breadboard and on a circuit board but the output is exactly the same. i took the same values for the parts as in post #1.

Jaypi, as SouthPawPaul said try to give the variable resistor a twist. But it looks like your text is pretty close to the right edge, that will give exactly the effect you see (you can see the same effect on the menu-test video when text-align is "pushed over the edge").

Try to change this (line numbers from version 16):
Line 73: #define align_text_ 22
Change to: #define align_text_ 14 (14 is probably too low, but just to check if it helps to move the text to the left).

Line 130: #define reset_values 0
Change to: #define reset_values 1

Please let me know if that fixed the problem

As it is said in the title i'm a newbie here, so don't be angry if my questions are silly

1) I have found 2 different schematics for this osd, which one is the right one?
a)

b) here is the difference in how potentiometer is connected or it makes no difference?


2) there is only one pin for video and it is marked as video in/out on b). And no video pin on a). So how do i connect the OSD. I thought that osd must stand between the cam and video tx/tv

3) is there a schematics on how to connect the current sensor

Thanks

Originally Posted by Dennis Frie

Great to see guys



Jaypi, as SouthPawPaul said try to give the variable resistor a twist. But it looks like your text is pretty close to the right edge, that will give exactly the effect you see (you can see the same effect on the menu-test video when text-align is "pushed over the edge").

Try to change this (line numbers from version 16):
Line 73: #define align_text_ 22
Change to: #define align_text_ 14 (14 is probably too low, but just to check if it helps to move the text to the left).

Line 130: #define reset_values 0
Change to: #define reset_values 1

Please let me know if that fixed the problem

Hi,

I had pretty much exactly the same distortion from memory.
Moving the text left as suggested above did help, but I still had some wierdness (e.g. notice that the first '0' on the timer is fatter than the others?)

I eventually discovered by accident that switching compiler versions made it work perfectly! avr-gcc (as used by arduino ide) on Ubuntu 11.10 had the distortion as above, but avr-gcc in Ubuntu 11.04 did not!

Dennis, can you tell us which gcc you develop with? (gcc --version) is it the one shipped with arduino-022 for windows?

Dave

hi,

i will eat my hat!!! it was the compiler. tried it now with ubuntu 11.04 and the osd output is brilliant! compiler version is now 4.3.4.
thank to all for your help.

joerg

Originally Posted by aSa2

As it is said in the title i'm a newbie here, so don't be angry if my questions are silly

1) I have found 2 different schematics for this osd, which one is the right one?
a)

b) here is the difference in how potentiometer is connected or it makes no difference?


2) there is only one pin for video and it is marked as video in/out on b). And no video pin on a). So how do i connect the OSD. I thought that osd must stand between the cam and video tx/tv

3) is there a schematics on how to connect the current sensor

Thanks

The schematics are exactly the same, only difference is the dimming/pixel resistor values R1 and R2. The video in/out is not shown in first schematic, but it should be placed as shown in the other schematic.
First schematic is "classic style" with ground in bottom etc. The second one is made for Arduino Pro to match the pinout etc.
The potentiometer is connected the same way on both schematics? It doesn't matter if you turn it around 180 degrees, it's just a resistor.

You can connect the OSD as you like, it doesn't have to be "between" camera and video-tx. You can just split the video-output (from the camera) and connect the OSD to one wire and the video-tx to another wire.

Regarding current-sensor, the schematic is shown in the datasheet (carefull, the first "drawing" in the datasheet has wrong pinout).

If I get time I will update the schematic this weekend to include GPS, voltage and current sensor.

Originally Posted by Dennis Frie

The schematics are exactly the same, only difference is the dimming/pixel resistor values R1 and R2. The video in/out is not shown in first schematic, but it should be placed as shown in the other schematic.
First schematic is "classic style" with ground in bottom etc. The second one is made for Arduino Pro to match the pinout etc.
The potentiometer is connected the same way on both schematics? It doesn't matter if you turn it around 180 degrees, it's just a resistor.

You can connect the OSD as you like, it doesn't have to be "between" camera and video-tx. You can just split the video-output (from the camera) and connect the OSD to one wire and the video-tx to another wire.

Regarding current-sensor, the schematic is shown in the datasheet (carefull, the first "drawing" in the datasheet has wrong pinout).

If I get time I will update the schematic this weekend to include GPS, voltage and current sensor.

Thanks for your answer and just to be sure, is that correct?

Originally Posted by aSa2

Thanks for your answer and just to be sure, is that correct?

Jep, that's perfect.
(You have written V-out and V-in, I suppose that's Video-out/in and not voltage-out and voltage-in )

Thank you Dennis for this great project. I now have the LM1881 working with your code and the video quality is OUTSTANDING! I now need to wire in the GPS and give this puppy an air time. I have the transmitter/receiver order.

DYI-OSD with LM1881 (0 min 10 sec)

I will attempt to make a simplified draws.

Originally Posted by rimshotcopter

Thank you Dennis for this great project. I now have the LM1881 working with your code and the video quality is OUTSTANDING! I now need to wire in the GPS and give this puppy an air time. I have the transmitter/receiver order.


http://www.youtube.com/watch?v=xhPrn2DnS2M

I will attempt to make a simplified draws.

THAT IS COOOOL