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Messages - mindnumbinglyfun

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IR Pens / touch-sensitve pen
« on: January 27, 2011, 08:53:03 PM »
i want to build a touch-sensitive pen. ive seen a couple ideas and only one how-to which seemed alright, but i feel like there must be other ideas out there. i want some ideas so i can expand on my own ideas before i commit to them and begin building. what have you contemplated, built, or seen?

IR Pens / Re: built IR pen! works beautifully! except..
« on: January 27, 2011, 07:31:28 PM »
maybe i should have given an update. it works just fine. i guess the odds were very against me but it turns out that random LED from an old remote control works fine.

i do have a radioshack IR LED (940nm). i havent tested it yet (no need to build another pen yet, my one works fine) but when i do i will see if it works any better. my one and only problem so far has been that i am unable to track about half of my 50 inch plasma tv with it. i followed some of boon jins advice on the matter (in his smoothboard faq) and was unable to get good results. looking at the tv through my camera and testing the pen showed me that not very much light at all was reflected. after many attempts to fix this i just decided that my tv absorbs too much light. but maybe a 940nm IR LED from radioshack will work better than this random and outdated LED.

Other Projects / Re: powering sensor bar via usb
« on: January 14, 2011, 10:51:09 AM »
i dont have a 6 LED wireless sensor bar, i have the stock nintendo 10 LED wired sensor bar.

would removing 4 LEDs from my 10 LED sensor bar effect the gameplay of my wii at all? if i did remove 4 LEDs, would the other 6 now receive too much power upon plugging it into the wii?

Other Projects / powering sensor bar via usb
« on: January 13, 2011, 10:39:00 PM »
I want to add a usb cable to my sensor bar for pc use. I understand the LEDs in the bar collectively use 7v of power, and the usb is 5v. Watching a youtube video on this, I learned that removing 4 LEDs would solve the insufficient power issue but I am left wondering if this is all a good idea..

Will I retain all functionality? Is there anything wrong with this idea in general?

alternatively, ive also read it is possible to power the entire sensor bar (all 10 LEDs) with one 9v battery. the problem there is over-powering. but broken down each LED is only over powered by what, less than 1/4v? what possibility is there that i could completely ruin my sensor bar this way?

Wiimote Interactive Whiteboard / increase reflection from tv?
« on: January 13, 2011, 04:13:39 PM »
I have a 50 inch samsung plasma tv I am trying to use as the whiteboard. Im having problems getting a good read from it though. Looking at thethe tv through my digital camera to view the ir light shows me it is absorbing probably a bit too much light. Is there anything besides cleaning the screen that may help?

IR Pens / Re: built IR pen! works beautifully! except..
« on: December 30, 2010, 11:22:58 AM »
ah, i didnt know it saw the reflection of the surface. thank you. i must have read something wrong.

im still waiting for my bluetooth adapter and led in the mail. i did happen to test my pen with the wiimote though, and it works! all i could really do to test it was to set the wiimote on something and have it point at the tv (so i could see the cursor on the wii), then i unplugged the sensor bar (making the cursor go away), then i positioned the pen about where the bar was and turned it on. the wiimote cursor came back! im guessing this means the random LED ripped from an old remote works on the proper wavelength :)

IR Pens / built IR pen! works beautifully! except..
« on: December 28, 2010, 09:55:04 PM »
this might sound dumb but i was excited when i first discovered the whole whiteboard thing, so i rushed into this.. i ripped an IR LED out of an old remote.. did not check the viewing angle before constructing my pen..

it looks from what i can see with my digital camera (most can see IR, did you know?) that looking at the LED from the side, and especially the rear-side angle, you can hardly see the light at all. i am doubtful the wiimote will be able to detect this. (havent tried, bluetooth dongle is in the mail!)

i briefly googled my problem and seemed to find an old post on an unrelated subject which happens to also be able wide viewing angles for LEDs. it was said:

The viewing angle of your LEDs is too small,  increase the viewing angle by filing the LED lens tips down flat, almost to the metal part and then make the final finish transparent matte (not too shiny, not too rough).

...their viewing angle is too narrow for head tracking but this is easily fixed by filing the lens tips down flat. This reduces their brightness due to a wider emission angle but they're still no less bright than commercially bought wide angle LEDs like SFH485P.

so i am considering filing down the tip of my LED. i am far too impatient to wait for the correct part to come in the mail. i will of course order it, but in the mean time.. will this work? maybe? tips? (how do i make the finish transparent matte??)

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