Hawi Pen




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Published on Nov 3, 2013

Last week I showed the chain driven system I added to Hawi, which could move up and down, as well as to left and right.
To try and make it useful, I've attached a dry-erase marker to it, with a longer term goal of making it draw something.
Until I get there though, I need a way to apply the marker to apply just the right amount of pressure on the dry-erase board (the desktop tower in video is just a stand-in for the dry-erase board for now)

The marker assembly consists of a spring and two switches. The two switches are not quite at the same level, on purpose, to detect the 3 possible cases:
-the two switches are off: not enough pressure. Move forward.
-only the first switch is on: pressure is just right. Stay there.
-the two switches are on: pressure is too much. Move away.



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