Author Topic: Tip Switch pen - Part 2 Drifting calibration?  (Read 4000 times)

Offline lderooy

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on: October 07, 2008, 07:38:52 PM
I have been using the tip-switch pen for awhile and it seems to work great for writing on a white board with a projected image.  With a tip switch, you don't have to worry about coordinating the writing with pressing a button.  You can see my earlier post about the pen or look here for pictures

So far, the pen has a Vishay TSAL6400 IR-Led, (2) 1.5 volt type "N" batteries a resistor and a tip micro-switch. I opted for a 3 volt system to have something that would not be too sensitive to battery drainage.

I have been using the "Wiimote Smoothboard" software with two wiimotes (one on the left and one on the right of the whiteboard - mounted about 4 feet off the ground.) I used the Smoothboard option to Activate Smoothing (under the Cursor Control tab).

I have also been working with Jarnal which is a note taker and PDF annotator.

I lent the pen and wiimote system to a colleague who used it for a presentation\meeting.  He had never used the system before and used it to animate a power point presentation during a long meeting.   He said that it worked great but then after an hour or so he found that the IRpen was not longer calibrated - it seemed that the calibration drifted.

I am not sure if the calibration actually drifted or possibly one of the wiimotes got bumped.  I will now try to find a better mounting system to stop the wiimotes from moving.

Has anyone had problems with the calibration drifting?

Offline freeztech

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Reply #1 on: October 07, 2008, 08:07:17 PM
I had a problem which I thought was the calibration being off but it turns out that when I looked at it. my grip had shifted on the pen. so I conducted a little experiment and used human nature to figure out that you do shift your grip after awhile. so it was simply that. It could also be like what you said. someone had bumped one of the wiimotes adn messed that up. but I haven't worked with a two wiimote system, so I'm not sure if moving one would affect the calibration because of what the other wiimote is sending. so if someone could run some tests and figure that out that would be great.

Only few of us can see. even less know of that ability and even less than that can actually use what is theirs. Now why is it that those who are blind leading those who can see?