This converts the IKEA Knäred led torch into a pinhole projector making it a nice childrens night light.
The idea is that an ideal point light source can project a sharp image without using optics for focusing. This is not very efficient because most of the light is blocked behind the pinhole, resulting in a pretty dark image. It still works reasonably well in a dark room.
The hole size and the alignment with the led affect the projection quality. It is not a perfect point light source, so the projection gets a bit blurry a farther distances.
The Knäred torch is nice little hackable light. I originally had this idea in 2016 when I first got one, now I finally got around creating it. Unfortunately it seems it is no longer sold by Ikea.
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