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Mine Exploration Forum

Author Powerful photography aid
royfellows

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Joined: 13/06/2007
Location: Great Wyrley near Walsall

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Powerful photography aid
Posted: 13/05/2008 16:14:22
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Hi Gang
I have just got the testing stage of an underground photography aid that I have built.
It comprises 2 units.

1/ A radio controlled receiver unit that runs on 12 volts and gives a choice of external connectors.
2/ A 12 volt camera shutter release that connects to item #1 by a cable.

Description:
The radio receiver unit is constructed inside a clear lid Appleby box 150 mm long, 115 mm wide and 75 mm deep. It contains a Maplins 12 volt rechargeable battery, and a Maplins 2 circuit radio receiver unit.

RF circuit #1 is 12 volt output to a 2.5mm external jack, or by a second switch to an internal lighting system yet to be fitted. This will probably be an array of 3 SSC P7 mounted on a computer CPU heat sink complete with fan, (12 volt).

RF #2 is basically an external connection open/close and connects to a flash hot shoe connector and a flash socket jack, both taken from an old broken SLR camera. Master switch is either recharge or power; a second switch turns on/off the circuit for the 'light bomb'. Charging is by a standard 12 volt AC adaptor to 2.5 mm jack plug, and is actually the one I got with a Maplins 8 battery AA/AAA recharger kit.

Now read this carefully!
I have just tested it for range by connecting a flash gun up. I first tried it the full length of my drive which is 60 metres. No problem. I next took it out into the road, and although it sometimes took 2 presses of the key fob transmitter it actually worked up to about 90 metres.

2/ The shutter release. This is based on a 12 volt central locking motor again from Maplins. I basically used 25 mm copper pipe connector to fit a cable release to the end, and it works a treat. Looks a bit "Made in Kazakhstan", or possibly the ‘plumbers delight’ but it still works

Its a hulky piece of kit but has enormous advantages. The radio control unit works at a greater range than any slave unit and obviously gives as many firings as you want. When the super light is fitted this will give even more versatility. Alternatively, I can use multiple exposures in big stopes and flats.
When its finished in its entirety I will upload a document on it with wiring diagrams, part number, costing and some pictures.


--

'There's a lot of activity for a disused mine!' - Bond in 'A view to a kill'
IP: 78.145.8.202 Edited: 13/05/2008 16:18:04 by royfellows
Barney

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Joined: 01/12/2005
Location: Warwickshire

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Powerful photography aid
Posted: 13/05/2008 16:51:18
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Sounds damn good Roy!
If you earth the key fob transmitter, do you get a greater range, I.E. over 90m?

--

C'mon!
IP: 81.158.143.217
royfellows

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Joined: 13/06/2007
Location: Great Wyrley near Walsall

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Powerful photography aid
Posted: 13/05/2008 17:38:19
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Never tried it.
Can you explain futher please?

--

'There's a lot of activity for a disused mine!' - Bond in 'A view to a kill'
IP: 78.145.8.202
Mr Mike

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Joined: 09/06/2007
Location: Bury - In The Laboratory

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Powerful photography aid
Posted: 13/05/2008 21:16:56
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Roy, I have done a lot of work a radio control systems, one thing which really reduces range is how close the antenna is to the ground, if its too close you get grounding effects and range loss. Lifting the TX and RX off the ground, to say a 1m helps a great deal. In practice radio links should be around 3m of the ground, but that as you prob already have thought is neither use or ornament down a mine.

It may help, depending on what sort of RC system you have got.
IP: 79.66.11.42
royfellows

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Location: Great Wyrley near Walsall

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Powerful photography aid
Posted: 13/05/2008 21:38:46
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This is interesting.
There is trailer at the end of my drive and I put the receiver on top of that for my first test, its probably about 3 feet off the ground.
For my second, were I walked about 90 metres down the road, I put the receiver on top of one of my corner brickwork posts at the corner of my boundary wall, I dont know the proper name for them but they are about 4 feet high.
Of course, if one were to be setting up a photograph underground, its unlikely one would put the receiver on the floor, it would be on top of some packwork or similar, with the flash either pointing sidways or towards the camera but shielded from direct view.

--

'There's a lot of activity for a disused mine!' - Bond in 'A view to a kill'
IP: 78.145.8.202
Barney

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Joined: 01/12/2005
Location: Warwickshire

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Powerful photography aid
Posted: 13/05/2008 22:00:05
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royfellows wrote:

Never tried it.
Can you explain futher please?


As daft as it sounds, i was thinking about the tried and trusted technique with car key fobs at distance. If you put the metal part of the key against your head, the range it works over is far greater.

--

C'mon!
IP: 81.158.143.217
royfellows

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Powerful photography aid
Posted: 13/05/2008 22:32:09
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Its getting late and the beer's going flat, I shall experiment in this direction tomorrow, and report back without fail.
Goodnight all.
RF

--

'There's a lot of activity for a disused mine!' - Bond in 'A view to a kill'
IP: 78.145.8.202
Moore Books: Specialist Books I.A. Recordings: Mining and Industrial History DVDs Starless River - Caving Store Explore a Disused Welsh Slate Mine
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