Monthly Archives: April 2013

Pebble, More Impressions, Scratch Repair (Hiding)

I wore the Pebble every day. The display is still amazing, battery life has never been a problem. There’s been firmware updates and the UI has some great improvements.

Usually when I hit my wall (my desk is in the corner beside a wall, right by my left hand, where I wear my Pebble), the Pebble handles it just fine without any scratches. But this time I hit a stone pillar outside, and it got some deep scratches.

The scratches were too deep for any conventional polishing techniques. I could try sanding it and then running it under a buffing wheel, but I do not have access to one. So I was pretty sad, especially because I already ordered some screen protectors for it.

The first lesson here is that, if you want a Pebble, you want a screen protector as soon as possible.

With that said, I’m not the kind of person who just gives up. When the screen protector arrived, I did an experiment.

Petroleum jelly, aka Vaseline, has a similar refractive index to most plastics. I know this because I know that you can repair scratched LCD monitors by spearing Vaseline over it. The Vaseline will fill the scratch, and since the refractive index is matched, the light travels through it without bending or reflections, this makes the scratch invisible. I smeared some Vaseline over my Pebble, and the scratches disappeared. Great!

The next problem is that the Vaseline will rub off and wash off eventually, unless you cover it up somehow. So the next part of the trick is to install a screen protector to cover up the Vaseline. So clean the screen with soapy water to get rid of any oil, dry it off, smear some Vaseline on it, apply the screen protector, and squeeze out any bubbles. Then let it sit still for an entire day or two. Make sure your hands are clean and no dust ever lands on it while doing this.

I highly recommend using Gadget Wraps for this, because their “wraps” is two parts, one part is a sticky decorative part (the brushed metal one looks amazing on a black Pebble) and a second part which is a clear screen protector. The sticker has a rectangular cutout in the center, where the screen protector sits in, in the end, everything is perfectly smooth. This makes my method of hiding scratches much easier because the sticker traps the screen protector, making it easier to squish out the bubbles.

Some pictures: http://i.imgur.com/QOvWHYz.jpg and http://i.imgur.com/fDLZCHL.jpg

Our Fourth Year Design Project: ARUCI

We turned my phone into a universal remote that uses augmented reality. We can track the location of objects and identify them in real time, so we can overlay an icon representing the object on the video shown on the touchscreen. Simply click on the object to interact with it. It’s all wireless, no base station required.

Actual video is 1080p, I recommend you view it full screen.

Presentation slides: without notes and with notes

Photos:
http://imgur.com/a/oRjll

Our group did circuit and PCB design, we did the soldering, we designed the phone casing, we designed all the IR and RF protocols, we wrote our own firmware and Android app.

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