[MakeLV] Fwd: Ohm Sense makes sense of resistor color bands

[Chris Callie]

For those of you that don't follow Hack-A-Day. Looks like someone read our
mailing list, and made the resistor app!

Chris Callie
------------------------
Mail: reddog176 at gmail.com
Web: http://www.google.com/profiles/reddog176


---------- Forwarded message ----------
From: Reddog176 <reddog176 at gmail.com>
Date: Sat, Aug 6, 2011 at 4:17 PM
Subject: Ohm Sense makes sense of resistor color bands
To: Chris Callie <reddog176 at gmail.com>




Sent to you by Reddog176 via Google Reader:


Ohm Sense makes sense of resistor color
bands<http://feedproxy.google.com/~r/hackaday/LgoM/~3/v87QjycaXNI/>
 via Hack a Day <http://hackaday.com> by Brian Benchoff on 8/6/11

 <http://hackadaycom.files.wordpress.com/2011/08/phone.png>

[Alex Busman]‘s first foray in iOS programming looks like a pretty useful
tool. He came up with Ohm
Sense<http://itunes.apple.com/us/app/ohm-sense/id453570510?ls=1&mt=8>,
an iPhone app that will take a picture of a resistor and calculate the value
based on the color bands. It’s a great tool that we wish we had when we were
starting out. At 99 cents, the app is also much cheaper than the emotional
cost of our relationship with
Violet<http://en.wikipedia.org/wiki/List_of_electronic_color_code_mnemonics>
.

[Alex]‘s used OpenCV <http://opencv.willowgarage.com/wiki/> for processing
of the image data. The app works by scanning the image from the top-left
corner and continuing until it sees a beige rectangle. After a bounding box
is drawn around the resistor, the iPhone scans the image for columns of
color. After a little interpretation, the value of the resistor is displayed
on the screen. While it only works on resistors with beige plastic now,
[Alex] says he’ll expand that in the future to include blue bodied
metal-oxide resistors. [Alex] says the coding only took a week, so if anyone
would like code a similar app for Android, be sure to tell us on our tip
line <http://hackaday.com/contact-hack-a-day/>.

This isn’t [Alex]‘s first Hack A Day build. We featured his Handy Board
project<http://hackaday.com/2011/06/28/handy-board-plays-music-with-an-nes-controller/>that
uses an NES controller to play some chiptunes earlier this summer.
Compared to the projects we’ve let slip over the last few months, it’s good
to see *someone* did something productive with their summer.

[Alex] posted a demo of his resistor app on YouTube. Check it out below.
<http://hackaday.com/2011/08/06/ohm-sense-makes-sense-of-resistor-color-bands/>
Filed under: iphone hacks
<http://hackaday.com/category/iphone-hacks/>, Software
Development <http://hackaday.com/category/software-development/>, tool
hacks<http://hackaday.com/category/tool-hacks/>
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