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rfrancoch / arduino-tvout

Automatically exported from code.google.com/p/arduino-tvout
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No CRTs sync. #63

Open GoogleCodeExporter opened 8 years ago

GoogleCodeExporter commented 8 years ago 
What steps will reproduce the problem?
1. Using Beta 1 library and 1.0.3 on R3 Uno w/ 1K and 470 ohm resistors.
2. Running the demos
3. Using with NTSC CRT composite input monitors

What is the expected output? What do you see instead?
Properly synced video.
Instead I cannot get any of the displays I have to sync, 
I can tell the video lines are there, but they roll.
I have tried a 9" professional green mono monitor, a 9" professional color 
monitor, an LCD TV, an a  Commodore 1702.  The closest I
get to syncing is with the Commodore using the back panel luminance input.
It almost gets it.

What version of the product are you using? On what operating system?
Beta1 on Windows (not that that should matter)

Please provide any additional information below.

Original issue reported on code.google.com by douglas....@gmail.com on 7 Mar 2013 at 3:30

GoogleCodeExporter commented 8 years ago 
Got it working but don't understand why.
My understanding was that by default on the Uno the library
used Pin 7 for Video and Pin 1 for Sync.
I printed these VID_PIN and SYNC_PIN and verified this.
But I got suspicious when I pulled the Pin 1 wire and saw NO change
to the CRT.  I pushed it into Pin 9 and Voila, it worked.
Why it is using Pin 9 I do not know.

Original comment by douglas....@gmail.com on 7 Mar 2013 at 5:38