plotclock
a clock that plots time
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Lasercutter or 3D Printer
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one Arduino (e.g. uno)
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three RC-Servos Mini (e.g. Tower Pro 9g)
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one whiteboard marker, dry eerasable (e.g. WB SL DRYWIPE MARKER)
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Screws, nuts, washers M3 and a tap for cutting M3.
(see illustrations at http://wiki.fablab-nuernberg.de/w/Ding:Plotclock#Zusammenbau )
use the plotclock SKP file for alternative 3D-Parts.
The blackend area in the PDF are to be engraved, not cut. This improves grip for the servo hubs.
This can also be constructed from cylindrical parts.
under the screw heads just have enough play for smooth movement.
http://playground.arduino.cc/Code/time is used as a clock library.
Employ a small daughterboard for powering the servos, if needed.
servo mounting if needed. Acrylic is brittle and easily breaks wen the mounting holes are to small. Only push the servo arms onto their hubs, don't secure them with screws! For initial calibration do not mount the resting clip for the wiper (danger of collision with the pen). Glue or screw the servo arms to the acrylic parts.
arms move between 2 positions, which correspond to exaxtly 90° servo movement.
The calibration values SERVOFAKTOR, SERVOLEFTNULL, and SERVORIGHTNULL allow to adjust the actual positions to the ideal ones. Please take care that the servos allow sufficient range and do not hit their internal end stops. If needed move the servo arms on the hubs.
the Arduino scetch or remove the line.
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this actually is my first git project, so merging, forks etc. is still new to me and could take some time