Color output

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  • #9097
    jcarb
    Participant

    I came across this thread in the arduino forums. Is there a chance it’s code could be reused to generate color video overlays? I know the circuit would need some modifications but that is no problem

    https://forum.arduino.cc/index.php?topic=169674.0

    #9098
    Michael
    Keymaster

    To get color, people have to replace the 16MHz crystal on the Arduino with a 14.31818MHz crystal. This is hte frequency of the color burst portion of a composite signal.
    I’m not sure color is possible without doing that.

    #9099
    jcarb
    Participant

    That makes sense, I have a few breadboard Arduinos where I could replace the crystal.

    By any chance is there a way to get black output? I recall seeing a thread where a MOSFET was used to sink current to adjust the black level but can’t seem to find it. It would make reading text against bright surfaces much easier!

    #9105
    Michael
    Keymaster

    Here is a discussion about using a MOSFET or 4066 analog switch. I used a 4066 analog switch to turn off the video signal for lines in a certain range.

    https://nootropicdesign.com/store/forums/topic/black-letters/

    It was a long time ago, so the details may be fuzzy for me….

    • This reply was modified 2 years, 1 month ago by Michael.
    #9518
    jcarb
    Participant

    It has been a while! I ordered the parts last year but never got around to trying it. I found this youtube video that has the tvout with color code, I was able to get it to compile but do not have any 14.3MHz crystals on hand.

    I am ok with modifying my Arduino’s crystal, do you think that code and the TVOUT-VE code can be merged/branched?

    #9519
    Michael
    Keymaster

    The TVout-VE code is on GitHub, so feel free to fork the repo and apply the changes if you think it can be done. I assume the TVout code to do color has many modifications. I’m just buried in other projects and not doing any video stuff now. (Video Experimenter is from 2010)

    #9521
    jcarb
    Participant

    I took a gander at the code and at first glance they appear to be totally different. I will probably have better luck comparing the normal TVout to TVout-VE to find the differences then apply that to the TVout-color code. I am not too familiar with AVR assembly though

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