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A clock that plots time. Designed with makeability in a fablab/makerspace/hackerspace in mind.
Update to V1.01:
added calibration routine and documentation to arduino code
see the instruction tab above for building instructions
Update 08/15: You might want to take a look at http://www.thingiverse.com/thing:931498/#instructions for a more detailed documentation
Update 10/15: You should also check out http://www.instructables.com/id/Plot-Clock-for-dummies/?ALLSTEPS Thanks to Kjetil Egeland!
Materials I used:
(for version 1.01!)
Lasercut plotclock_beta1.pdf from 3mm material or 3D print plotclock_SUP7.skp
3D print swee.stl or reuse some other cylindrical part for the sweeper
Tap 2.5mm holes with M3 thread
Assemble arms with M3 screws, gently adjust the counternuts so that the joints under the screw heads just have enough play for smooth movement (see joint picture).
load Arduino sketch plotclock_V1, see code comments for further information
Add some sort of cloth with double sided tape to sweeper
Attach servos to digital pin 2, 3 and 4, according to arduino sketch, test them without anything attached by plugging in the arduino (the photos show it being connected to 1, 2 and 3, which isn't optimal since 1 is also the TX pin, so during arduino startup the lifting servo jumps around)
Put everything together
When attaching the servo arms, make sure they can turn enough to reach every point on the drawing surface by manually turning them
Power the arduino, it should start a calibration cycle where every second the position of both servos changes by rotating exactly 90 degrees (see last image in gallery)
Change the SERVOFAKTOR, SERVOLEFTNULL and SERVORIGHTNULL values until everything matches up (see code for more information)
This description is still a bit of a WIP, so comment if you have any questions!
Plotclock by joo is licensed under the Creative Commons - Attribution license.
So what's this mean?
We're sure joo would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!