I’m fortunate enough not to be color blind, but with this knowledge I can read most resistor values even in bad light because in most cases I know what it must be: If it looks like orange-violet-brown I know it’s probably really red-violet-brown because 370 ohm resistors don’t exist (at least not with 5% or 10% tolerances), and 270 ohm is an E12 value. The first thing I ever owned that was related to electronics was a credit card sized plastic thingy from Philips that let you rotate 4 discs inside it to select colors and see the values. When I was about 7 or 8 years old, one of the first things I learned about electronics, without even knowing what it was, was the list of E12 values: 10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68, 82. Posted in iphone hacks, Software Development, Tool Hacks Tagged app, iphone, resistor, resistor color bands, tool, violet is a goddamned whore Post navigation posted a demo of his resistor app on YouTube. 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. We featured his Handy Board project that uses an NES controller to play some chiptunes earlier this summer.
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. While it only works on resistors with beige plastic now, says he’ll expand that in the future to include blue bodied metal-oxide resistors. After a little interpretation, the value of the resistor is displayed on the screen. After a bounding box is drawn around the resistor, the iPhone scans the image for columns of color.
The app works by scanning the image from the top-left corner and continuing until it sees a beige rectangle. ’s used OpenCV for processing of the image data. At 99 cents, the app is also much cheaper than the emotional cost of our relationship with Violet. It’s a great tool that we wish we had when we were starting out. He came up with Ohm Sense, an iPhone app that will take a picture of a resistor and calculate the value based on the color bands. ’s first foray in iOS programming looks like a pretty useful tool.
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