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ecm
Apprentice
Canada
89 Posts |
 Posted - Feb 12 2004 : 8:20:41 PM
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I would like to share my newest project wich is my motorized cam mount for in car filming its got variable rotation speed and four quadrant stop and a manual position for in between quadrant here is the link to my web site if you want to look at it http://members.rogers.com/montecarloss/motorizedcammount.html and if you have any comment go ahead its not finish yet.
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cirvin
Nobel Prize Winner
USA
1542 Posts |
Posted - Feb 12 2004 : 8:29:17 PM
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Nice! Where did you get the motor and gearbox? That is like my camera.Do you have schematics? Any plans for vertical movement?
http://daxter12.topcities.com |
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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
Posted - Feb 12 2004 : 9:44:37 PM
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spiffy design, is the motor only being held in by its leads?
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ecm
Apprentice
Canada
89 Posts |
Posted - Feb 13 2004 : 5:58:43 PM
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Hi and thank you for the comment. I added some new pics with description and will post the schematic for the speed controler later and the wirring for the switches. for vertical movement well that for later as it will required the use of brushes for the connection of the other motor.
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YS
Nobel Prize Winner
USA
1132 Posts |
Posted - Feb 14 2004 : 10:11:38 AM
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1. You may add a flat spring to the momentary switch, so the stop rod does not contact the switch directly, but via the spring. With correct placement of it and a proper bend, you will not need to remove parts for reversing the drive. Besides, you can use two stop rods to contact the same switch and change the direction automatically using simple logic circuit, analyzing switch condition and current direction.
2. If you want to use this mount a lot, you should think of optical sensors. Take them from old mouse for instance. To use optical sensor in unpredictable ambient light use modulation on the LED, something like several kHz, and decouple photodiode from preamp with small capacitor, thus filtering out DC from the sun and 120Hz from fluorescent light - you never know where you will have to use your design.
3. With a spring or optical sensor, you may add as many rods as you want, and count them, changing the start and stop position from your control device. You may even use a microcontroller but it is not necessary - just simple reversible counter will do. Then you can use buttons or rotary switch to control angles.
4. Well, one more sip of coffee.. now we are ready to discuss a PC interface, are we not? think of printer port. Use its output to control the motor and input to count pulses from optical sensor.. use one more output to control the camera - hey! fully atomated now!!
PS: Nice mechanical job, I feel envious :)
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ecm
Apprentice
Canada
89 Posts |
Posted - Feb 15 2004 : 1:59:28 PM
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Ok the diagrams have been posted on the same web pagehttp://members.rogers.com/montecarloss/motorizedcammount.html and Thank's YS for the sugestion but i dont have the material for such a advance system and I tryied to keep it simple as it will be use in my car mainly.
For the gear box you take the micro switch off no use on there the lever inside the gearbox is like a lock to keep the gear from revesing easy fix open the gearbox and remove the lever that it .
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Kale
Nobel Prize Winner
Canada
795 Posts |
Posted - Feb 15 2004 : 4:05:59 PM
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Very nifty, but what exactly are you doing with it? Filming while in your car? How does the rotation help?
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ecm
Apprentice
Canada
89 Posts |
Posted - Feb 15 2004 : 6:27:34 PM
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yes it is for the car and while driving or at the drag strip you can change the view to four pre selected location by just pressing the switch on the controller on the front side that will start the rotation to the next stop so you dont have to look or manipulate the camera just press the button again and it will go to the next stop or if you want to go let say from rear to front just hold the button to skip a stop and it wil go around till you let go of the switch.
i will make another video of it working in position soon, the video that i posted was just a test of rotation no switch install yet. keep the comment comming this is interesting .
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Edited by - ecm on Feb 16 2004 8:11:03 PM |
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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
Posted - Feb 16 2004 : 10:03:03 PM
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what about a potentiamiter to sense location of the camera. it would be pretty easy to add to.
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ecm
Apprentice
Canada
89 Posts |
Posted - Feb 18 2004 : 6:06:35 PM
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Good idea but dont know how to do that , I was thinking of putting 4 micro switch connected to leds for the location .
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Edited by - ecm on Feb 18 2004 6:07:01 PM |
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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
Posted - Feb 18 2004 : 8:19:23 PM
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basically you would just hook a pot (the continous type) to the gear. you have a transistor with a resistor tied to the base which keeps it closed untill the pot's resistance drops to the point that the base is pulled low, so that the motor stops. the value of the resistor governs where the motor stops
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YS
Nobel Prize Winner
USA
1132 Posts |
Posted - Feb 18 2004 : 10:32:27 PM
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basically, yes. But practically, such a setup will be not stable. There will be no clear treshold and it will change with supply voltage and temperature. Also, you will need very high quality pot, or it will die soon.
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ecm
Apprentice
Canada
89 Posts |
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cirvin
Nobel Prize Winner
USA
1542 Posts |
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ecm
Apprentice
Canada
89 Posts |
Posted - Mar 13 2004 : 8:45:43 PM
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updates my site as been moved to tripod , rogers was getting to be expensive so here is the new url http://alsmontess.tripod.com and by the way if any one as some spare time and would like to give me a hand on figuring out how to get my cam mount to be control by 4 switch here is my prototype click on directional mount at my site since tripod dont allow linking.
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Topic |
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motorized cam mount
