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Old Mar 11, 2008, 11:35 AM   #1
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Unusual request...

I need to power a small 5v engine ( voltage tolerant though) which rotates the camera continuously while taking pictures. Because the camera is attached to a blimp, i am trying to save on weight and extra batteries.

Have you heard of any hot-shoe adapter which would allow me to obtain a small power plug, on which I could connect the engine to ?

Using the USB out of the camera to obtain some power would also be acceptable.

Of course, I do not want to drill into my d200, I need some clean stuff.

Phil
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Old Mar 11, 2008, 11:48 AM   #2
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I nominate Phil for "The Steve's Digicams 'Oddest Request' Award". :-)

The hot shoe only provides an instantaneous flash of electricity. It may be enough to power your motor, but only for a very brief period, and only while the shutter is open. I don't think you want to rotate the camera while that is happening.

I think you would get everything you need to do this by disassembling a Radio Shack radio controlledcar.

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Old Mar 11, 2008, 1:28 PM   #3
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The D200 is not known for having terribly great battery life to begin with. Certainly running a small motor would deplete the battery even faster. The D200 is also quite heavy (and expensive)....probably not a great idea to have it flying around.
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Old Mar 11, 2008, 2:13 PM   #4
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Hotshoes are not designed to provide power.

The flash provides the power. ;-)

A camera with an ISO standard hotshoe is simply closing the circuit (shorting) between the outside of the shoe and the center contact to trigger the flash.

That's why you need to check the trigger voltages on some older flash models (by measuring the voltage the flash is providing between the outside and center contact in the flash foot), to prevent damage to some newer cameras (because they close the circuit electronically versus using a mechanical relay).

The other contacts in models like your D200 are used for proprietary communication with a dedicated flash (probably signaling at TTL level voltages) and are not designed to provide power.

Even if you could pull power from a camera, you'd risk damaging it's circuitry. They're not designed to provide power to external devices.


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Old Mar 11, 2008, 4:28 PM   #5
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ok, thanks a lot.

BTW the D200 flies quite well
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Old Mar 11, 2008, 4:53 PM   #6
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philgib wrote:
Quote:
Using the USB out of the camera to obtain some power would also be acceptable.
Only a powered hub (which the camera is not) can output 5V and it's limited to 100mA/port...
-> How much current does the electric motor draws?
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Old Mar 13, 2008, 3:46 PM   #7
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Quote:
Only a powered hub (which the camera is not) can output 5V
OK, this is was my last hope that you just destroyed. So not much solution except drilling the camera bottomand connect to the existing battery. I won't do it,2nd hand value of the camera would be decreased by too much.

Thanks anyway

Phil
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