Fabrication

Fabrication: /final/ Auto-shutter

I wanted to make a auto-shutter for my camera, maybe it’s useful when shooting stop motion or drawing light painting at night. Although I know that the structure must be a big challenge, I think I will gather a lot of experience during the experience. So I keep on going with the idea.

Thinking of the servo is rotate approximately 180 degrees, while the movement of pressing a shutter button has to be up and down, so I searched some mechanical principle diagrams on line. Finally this picture gave me the inspiration:

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Firstly, I bought these two pieces for fixing the camera on Amazon:

Cold Shoe Mount with 1/4-20 Hole for Blackmagic Cinema Cameras

Camera Hot Shoe Mount to 1/4″-20 Tripod Screw Adapter

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and this Micro servo on Adafruit

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Secondly, I made a 3D modeling by Rhino, which helped me to finger out the structure and the distance between each part. During the process, this

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Thirdly, made the AI file for laser cutter, in which I got the enclosure files on the website.

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Fourthly, I used laser cutter to cut a cardboard to make sure I masured correctly.
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Finally, I choosed two colors’ acrylic to make the device: one is for the enclosure of Arduino and battery; the other is for the moving part–the lever structure.

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The camera’s cold shoe was mounted on the acrylic lid by a machine screw and a washer. The washer is used for spread the pressure. Without it, the acrylic may be destroyed.img_8978The servo was fixed by two rectangle holes. One is at the bottom, the other is on the lid. Then the rotation part was stuck in a hole on the right side. In order to hold the servo more steady, I etched the shape of the servo on the surface of the acrylic, so part of the servo can also stuck in the acrylic board. When I put the servo in the box, there were no space for the wires of the servo. So I had to etch another groove on the lid. At first, I measured the length of the sevo by a mistake, so I etched several times, which result in I cut through some part of the acrylic.

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So here is the finished auto-shutter device. img_8860

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I wrote a program for Arduino, which let the servo to rotate half a circle and stop for a while, then rotate back. So the shutter can be pushed by the device automatically. I can also write a program to press the shutter for a long time, then I can have a long time exposure for light painting.

Here is the code for Arduino:

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