Hi Mirna,

Yeah, it is the reflection of the IR off the screen and directly from the pen.

That is the reason why the using multiple points to differentiate the clicks is not really suitable.

You can try preventing multiple detected IR points but choosing an IR LED with a narrow beam and also covering the sides of the LED with a material that is opaque to IR. This will prevent the IR from being captured directly from the pen but from the screen reflection.

Another way is to ensure a minimum distance between the two dots before processing this as two different points.

All the best.

Regards,
Boon Jin

Hi Mirna,

Thanks

The minimum distance that I mentioned is regarding the two IR points detected by the Wiimote. If the extra IR point is actually a reflection, usually it will be quite close to the original IR source. Therefore, maybe if you can try to ignore dots that appear very close to each other.

Where are you placing the extra IR LEDs?

Regards,
Boon Jin

This may have already occurred to you, but when I was playing around with the pen I had two buttons: one to turn on the pen and a momentary button to interrupt the circuit when pressed. Then I defined a click to be if a tracked IR source disappeared and then reappeared within a certain region and within a certain time (250 ms, though both of these could be added to the calibration step for the individual user). Thus a single click was a single click, a double click was a double click, and I tried both triple clicking and a poor man's mouse gestures to simulate a right click.

It may not be what you want, but it did work for me.

Hi Mirna,

just curious: why would you want that?
The whole idea is that you don't need that anymore... you can use your pen (or hand, or a stick, etc.) to point at things on your whiteboard. As soon as you click somewhere, your mouse pointer instantly moves to that area.

Calvin

Hi Mirna,

I  was recently trying to do what you say you have done ... (but only for the left click... in other words, only with two buttons), but i had the same problem that you have had.

When i press the first button sometimes it detects more than one IR light.

I would like to know if  the solution proposed by Boon Jin:

"The minimum distance that I mentioned is regarding the two IR points detected by the Wiimote. If the extra IR point is actually a reflection, usually it will be quite close to the original IR source. Therefore, maybe if you can try to ignore dots that appear very close to each other"

Was ulseful for you.

And if it wasnt useful for you, i would like to know if you finally solve this problem and how.

Thank you very much.

By the way Im working on my bachelor project too.