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Servos
>> A "pan" servo is mounted on a re-purposed spray paint lid. A servo bracket build using a tough cardboard material holds the "tilt" servo. A laser site with a dovetail rail is mounted to the "tilt" servo horn. |
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Servo Control>>
Using pulse width modulation, A pair of servos move a laser on an X and Y axes. When this is captured by a long-exposure camera, all movement of the laser is recorded in the image. This allows one to print words, and simple shapes. The size of the image is only limited by the amount of ambient light, and the strength of the laser.
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Laser
>> The laser is a dovetail mounted gun site. The pressure switch was cut off, and re-engineered to turn the laser of and off using a transistor to complete the circuit. |
Laser control>>
The laser is a dovetail-mounted site intended for use with a firearm. It had a pressure trigger control, that was meant to be attached to the handle of the fire arm. The pressure trigger simply touched two contacts together, completing the circuit, and lighting the laser diode. Cutting the cable above the pressure switch exposes a positive and negative wire, that when shorted, cause the laser to light. A transistor is used to complete the circuit, and control the status of the laser. The ability to turn off the laser enables the creation of "white space".
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Shutter
>> A re-purposed audio jack activates the shutter of a cannon rebel 2000. The camera is set to expose the image for several seconds, using the shutter-speed priority setting. During this time the camera will capture every position and movement of the laser , and an image will be "painted". |
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Shutter Control>>
Ravioli uses long exposure photography to capture the laser movements over a period of several seconds. Because a slight jitter can ruin a long exposure photo, it is good practice to use a remote shutter control. Most Cannon cameras use a standard shutter control system. When the Base, ring, and tip of a 16th" jack are shorted, the camera will take a photo. A transistor is used to complete the circuit between the base, ring, and sleeve of a re-purposed audio jack, signaling the camera to take a photo.
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