Dry erase board lined with IR sensors to record pen strokes [video]

Re:Dry erase board lined with IR sensors to record pen strok... by ohitsdom on Friday September 11, 2015 @03:00PM (#10205536)

Really impressive. Must be pretty sensitive IR sensors to not have false detections when the marker/eraser gets close to the board but doesn't touch it. Any info on the hardware and software stack?

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Re:Dry erase board lined with IR sensors to record pen strok... by arey_abhishek on Friday September 11, 2015 @03:15PM (#10205625)

Thanks. If the pen is about 2mm off the surface, there is a false positive. Also haven't done palm rejection yet, so your palm needs to be off the board to write.

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Re:Dry erase board lined with IR sensors to record pen strok... by arey_abhishek on Friday September 11, 2015 @03:27PM (#10205682)

I used an off the shelf IR touch frame bought from Aliexpress: http://www.aliexpress.com/wholesale?catId=0&initiative_id=AS... All touch inputs fed into Raspbery PI with a wifi dongle.

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Re:Dry erase board lined with IR sensors to record pen strok... by djrogers on Friday September 11, 2015 @03:02PM (#10205551)

Looks like it did actually have an FP+ on the eraser there if you compare the phone to what he actually erased onscreen.

I'll second the request for more info though!

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Re:Dry erase board lined with IR sensors to record pen strok... by arey_abhishek on Friday September 11, 2015 @03:32PM (#10205706)

The eraser did actually touch the board, but appears like it didn't because of the reflective surface. :)

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