Time-Lapse

**g-hoot** · - 14th May 2008, 20:32

Originally Posted by mackrackit

FYI g-hoot,
http://en.wikipedia.org/wiki/Photoresistor
Now Ted has code for his project too

and what speed to expect.

Dave,
Thanks for the link. I think the sentence below may explain why several different cells produce basically the same results:

"Many commercially available CdS cells have a peak sensitivity in the region of 500nm - 600nm (green light)."

Gary

**mackrackit** · - 14th May 2008, 20:53

Yeah, that green light thing nailed me a few years ago. Had a project working the way I wanted in the shop and never thought about how sun light has a different spectrum until I took it out side. All of my setting were off.

Ted's · - 14th May 2008, 21:06

I like the symbol

I am going to use a device that looks similar to a CDS cell and a ldr, maybe it is a ldr. It is very flat and it's dimensions are 4mm x 4mm. Do you have an idea on how to keep the LDR on the led even though the camera is moving?

**g-hoot** · - 14th May 2008, 21:20

Originally Posted by Ted's

Do you have an idea on how to keep the LDR on the led even though the camera is moving?

Well, I'm from OK, so tape is an obvious choice. :-) You could just use some long wires on the light sensor and tape it, or for a more permanent solution, maybe a clear glue on the face of the cell, then glue around the outside with something black to block light out. Black caulking would work. For the clear glue, use GOOP. It sticks to everything, is clear, and peels right off if you need to clean it off later.
Gary

Ted's · - 14th May 2008, 21:48

What is OK?

**g-hoot** · - 14th May 2008, 22:02

Sorry, the abbreviation for the state of Oklahoma in the US. We're kinda rednecks down here. Well at least some of us are. ;-)
Gary

Ted's · - 14th May 2008, 22:31

So "Well, I'm from OK, so tape is an obvious choice." is an insider joke, tell me what it is about

Back to topic: I like your ideas. But you are fishing in the dark and that is my fault. So I am going to create some light:

The camera is rotating and is taking photos to be combined in a time-lapse-movie. After that I take it from the retainer to connect it to my pc or to take some photos freehand. Then I want to put it in again.

When the photos are taken there is rapid movement being applied to the camera.

I thought about using a clamp, see picture, but I haven't managed to find out a suitable material yet. The problems arise because of the force being applied to the edges of the material(at the sharp angles of the clamp). I would have to subtly bend it over and over again which will sooner or later weaken the material to a critical degree.