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Adding video.

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Sam Jacoby
Sam Jacoby committed Dec 5, 2012
1 parent e905c64 commit 4d8541b97a62593707700731bf6a196bbeee8dda
Showing with 5 additions and 2 deletions.
  1. +1 −1 site/content/posts/posts/en-masse.html
  2. +4 −1 site/content/projects/paper-sensors.html
@@ -1,6 +1,6 @@
---
title: TapClip v.2
-summary: Onwards and upwards. Building the boards.
+summary: Onwards and upwards. Building a gang of touch-sensitive boards.
date: 2012-09-8 12:06:17
tags:
- SenseClip
@@ -15,8 +15,11 @@
This design is based on the work of the [George Whitesides Lab](http://en.wikipedia.org/wiki/George_M._Whitesides), who have done a lot of fine work in paper electronics. Actually, they've done most of the work in paper electronics. Pretty good stuff.
{{ macros.render_figure('<a href="http://www.flickr.com/photos/samjacoby/7195061592/" title="DSC_0133 by s_jacoby, on Flickr"><img src="http://farm8.staticflickr.com/7240/7195061592_7814160473.jpg" width="500" height="333" alt="DSC_0133"></a>', "Strain gauge, from [Paper-based piezoresistive MEMS sensors, Liu et al.](http://science.utep.edu/li/images/PDFs/2011%20paper%20mems%20loc.pdf)")}}
The black stripe is carbon-based ink, which has a far higher resistivity than the silver stuff, and changes resistivity dramatically when flexed. The components are attached with conductive epoxy, which works pretty well. You can speed the drying process along by throwing it in a toaster--you can see the baked lines on this guy. I left it in too long. Worked fine. When cured, the ink goes down to something like 0.3Ω/cm. Not bad.
-{{ macros.render_figure('<a href="http://www.flickr.com/photos/samjacoby/7195059934/" title="DSC_0120 by s_jacoby, on Flickr"><img src="http://farm6.staticflickr.com/5155/7195059934_aa410efe80.jpg" width="500" height="333" alt="DSC_0120"></a>', "Op-amp at the heart of the strain-gauge, doing some fine work.")}}
+
+This is an early test of just the paper gauge. It seems a little lagged, but I think that's just because I did a bad job syncing the videos--and because of the latency inherent in the flex of the paper.
+{{ macros.render_figure('<iframe src="http://player.vimeo.com/video/54917926?badge=0" width="500" height="281" frameborder="1" webkitAllowFullScreen mozallowfullscreen allowFullScreen></iframe>', '<a href="http://vimeo.com/54917926">Paper Strain Gauge.</a>')}}
This package just has four op-amps, each boosting up the signal to a different level. The blue blocks are adjustable potentiometers, to equalize the legs of the [Wheatstone Bridge](http://en.wikipedia.org/wiki/Wheatstone_bridge), making the gauge damn sensitive.
+{{ macros.render_figure('<a href="http://www.flickr.com/photos/samjacoby/7195059934/" title="DSC_0120 by s_jacoby, on Flickr"><img src="http://farm6.staticflickr.com/5155/7195059934_aa410efe80.jpg" width="500" height="333" alt="DSC_0120"></a>', "Op-amp at the heart of the strain-gauge, doing some fine work.")}}
### Paper Accelerometer
The accelerometer works on a totally different principle, and a lot of the fanciness isn't embedded on the page--though there is a transimpedance amplifier, in there, which converts the voltage on one plate into current, allowing for the flexing of the little paper tab to be picked up.

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