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'[PICLIST] [OT] Interesting Project looking for sol'
2000\08\18@183128 by Jim Ruxton

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I am helping a local artist create something that will probably end up
with a PIC or 2 in it. I'm just wondering if anyone has any suggestions
as to the best way to tackle this project. I am building a motorized
pan/tilt head which will initially hold a video camera. He wants to move
the pan/tilt head while recording a scene. As well as recording video he
wants to record the pan/tilt motion. I am using d.c. motors with optical
encoders so I can record the position over time. I'll use either a LM629
or perhaps the PIC based servo I.C.s from JR. Kerr to control and record
the motion. Once this info is recorded he wants to edit a number of
things he shot together , and play it back through a projector mounted
on the pan/tilt head. The recorded motion will also play back
simulaneously. My biggest challenge as I see it is synchronizing the
video and motion system. I was thinking of using the audio tracks on the
video to hold the data. I'm not sure how much data I can pack onto the
audio track. Does anyone know if this is feasible. Any suggestions or
thoughts would be appreciated. Thanks!
Jim

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2000\08\19@034202 by Stephen B Webb

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> pan/tilt head which will initially hold a video camera. He wants to move
> the pan/tilt head while recording a scene. As well as recording video he

It sounds like you will be building these pan-tilt units yourself..?

If you want an "out of the box" solution for this part of your problem,
try a company called "directed perception".  I haven't used their PT units
too much, but they haven't given me any problems yet.  They probably
aren't well suited to heavy projectors, though -- maybe 5 lb or so.

-Steve

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2000\08\19@060427 by mike

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On Fri, 18 Aug 2000 18:28:16 -0400, you wrote:

>I am helping a local artist create something that will probably end up
>with a PIC or 2 in it. I'm just wondering if anyone has any suggestions
>as to the best way to tackle this project. I am building a motorized
>pan/tilt head which will initially hold a video camera. He wants to move
>the pan/tilt head while recording a scene. As well as recording video he
>wants to record the pan/tilt motion. I am using d.c. motors with optical
>encoders so I can record the position over time. I'll use either a LM629
>or perhaps the PIC based servo I.C.s from JR. Kerr to control and record
>the motion. Once this info is recorded he wants to edit a number of
>things he shot together , and play it back through a projector mounted
>on the pan/tilt head. The recorded motion will also play back
>simulaneously. My biggest challenge as I see it is synchronizing the
>video and motion system. I was thinking of using the audio tracks on the
>video to hold the data. I'm not sure how much data I can pack onto the
>audio track. Does anyone know if this is feasible. Any suggestions or
>thoughts would be appreciated. Thanks!
>Jim
You could probably do a really simple quick & dirty solution using
radio-control servos - you could encode the servo pulses on the audio
track very easily. if you have stereo audio you may be able to record
the servo pulses, one per track,  with very little extra hardware.
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2000\08\19@073753 by wft

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Possibly your PIC can write to an unused audio track using a cheap 14.4 modem.
Then use the same modem to retrieve the data.  Position data can be as simple as
*1234   where * is the delimiter, 1234 is the position data.

Feel free to e-mail me if I can be of further assistance

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2000\08\21@034326 by Gennette, Bruce

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If you use a digital camera ALL of the frames are numbered in each 'take'.
100 half interlace frames per second here (120 in USA, etc).  Most editing
equipment (read digital videotape machine) can easily extract the seconds
and frame number within each second from the digital data stream.

I'm sure that a little research will let you know how easy it is to tap into
the time code data as it is recorded and played back.  Then you just need
some memory to record the time, tilt and pan data.

Bye.  (and let us know what you find out).

       {Original Message removed}

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