Strange problem

[jazzer73]

Hi!
I’ve build the schematic, omitting the switch and jumper, since I want it to do video overlay all the time, and to keep size down. However, I do have some major problems. Sometimes the overlay kind of shows, unreadable, wandering down the screen. Sometimes it’s not there.
Reflowed, checked for shortcuts, and so in, but can’t find anything wrong with the circuit.
If I look with a scoop at the video out pin (D8) it’s totally dead at 0 V

The sync out from the IC looks good, but the vertical sync out from IC seems a lot slower, going to zero every 10 ms.

I´ve made the circuit two times, one on veroboard and one breadboard version, no difference.

If I remove the “initOverlay” code I get text on the display, moving around. So seems like a sync problem. Tried with two different cameras also.

• This topic was modified 2 years, 10 months ago by jazzer73.

[jazzer73]

Ok, solved. Delete the libraries and copied them again, solved the problem. Works like a charm now!

[Author]

Posts