Electronics > Projects, Designs, and Technical Stuff

Help with triggering a camera with light?

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peps1:
Hello, was wondering if I could pick people's brains for how best to approach a project I would like to do.

Basically, I have a camera trigger set up for taking photos of 3D print time-lapses using a physical switch that the printer will make contact with and take a photo on each layer change resulting in this:

https://youtu.be/vDxkmtva1Xw

But I would like to adapt this to work with a resin printer and have it trigger when an LDR detects the light exposing each layer. And wonder how to go about this with minimal components.

magic:
How long is the light, how bright is the light, how long is the dark, how dark is the dark?

james_s:
A phototransistor ought to work, you might even be able to just wire it directly across the trigger for the camera.

If you need to trigger based on a specific light level and want flexibility you could do this cheaply with a BH1750 and an arduino nano, it's overkill but won't cost much over $5, it's very simple and you can tweak the behavior all you want just by altering the code.

ledtester:
Just get one of these:

https://youtu.be/KWZPJ-bkvEA

It might just be a phototransistor.

Terry Bites:
Put slotted photo interupters on the spools to monitor their motion.

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