Motorised screen circuit for car dvd player

Discussion in 'The Projects Forum' started by chaminda13, Jan 28, 2011.

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  1. chaminda13

    Thread Starter New Member

    Jan 20, 2011
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    I'm a complete newbie to electronics so need a lot of help

    I dismantled a chinese made double din dvd player(one of those all in one units) and want to use the screen sliding out mechanism with my own touchscreen for a carputer.
    The screen is moved by a 9v motor. It sensors its position using some sort of light sensors (diodes? see pic)

    So what I want to do is:
    1. There one button to control the screen.
    2. If i press it for a short period of time the screen moved a bit out (i.e the motor rotates a small amount). I can repeat this till i get the screen to a position i like
    3. If I hold down the same button for a longer period of time (lets say 3 seconds) the screen slides out to its fully open position. When its at this position the dvd drive get a signal to eject the disc
    4. While in the position if i press the button again the screen moves back completely to its vertical (neutral) position.
    5. Also if you insert a disc to the dvd drive the while fully open the same thing should happen i.e the screen should go back completely

    heres a pic of the screen positions. Also a pic of the motor and the black (?diode sensors)
    http://picasaweb.google.com/lh/photo/vGjsC-XO7PGNgyHyUdZkoA?feat=directlink

    http://picasaweb.google.com/lh/photo/y6V0P9r4QKYulMn-xTIkeA?feat=directlink

    http://picasaweb.google.com/lh/photo/Aum7zl2PaU4nLYLsWFRkTg?feat=directlink

    The power will be from the car batter so 12v. The dvd drive is a usb drive with a eject button. i can solder directly to the eject button. Not sure how i'll detect when a cd is inserted - think theres a microswitch which is pressed when a disc is in.

    I was thinking of doing this using relays (time delay relay, Polarity conversion cirtuit etc).
    I just need to detect when the screen is fully out and fully in so i can stop the motor/ eject disc. Was thinking of using micro switched (The diode sensors or what ever they are is a bit too complicated.)

    I was hoping someone can help me do up a circuit preferably using relays or if not some sort of IC.
    Please help me!
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    Where is this thing to be installed? Is this for back seat use?
     
  3. chaminda13

    Thread Starter New Member

    Jan 20, 2011
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    Its located in the front where the car stereo should be
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Doesn't that seem to be a major safety issue? Ford is already having problems becaues of a touch screen function selector.

    It sounds like a real driver distraction, so it runs into our automotive guidelines -
    We can't help you with the project.
     
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