I wanted to make more time-lapse videos of the magnetic putty doing other tricks. For this I decided to also add some new features to the time-lapse controller, namely the ability to dynamically increase and decrease the rate at which the pictures were taken.
The reason I wanted this functionality is that sometimes things happen more quickly and sometimes more slowly, so being able to adjust the shutter rate seemed like it would allow more interesting videos to be created. It was not particularly difficult to implement this and the resulting code can be found here:
With these new features I am firmly beyond the abilities of the built in time-lapse function of the D300 camera, so now there is at last a good motive to build an external time-lapse controller (in addition to the fun of it).
I made use of the new functionality while recording three new videos of strands of magnetic putty being pulled up towards a magnet. The result can be seen below.
I still am not sure what causes the flickering in the videos as I supply the LED light from a lab power supply set up to function as a constant current source. The only other light source in the room is my computer monitor which is aimed away from the scene.