Great tip for doing more with your dumpster-dive electronic plunder — a tool to help you learn more information about the components you discover. From Hack A Day.
So you just pulled a fancy component off of a board from some broken electronics and you want to use it in your own project. What if the data sheet you found for it doesn’t include measurements for the footprint? Sure, you could pull out your digital calipers, but look at the measurements in the image above. How the heck are you supposed to accurately measure that? [Steve] found an easy answer for this problem. He uses microscope software to process an image of the board.
One common task when working with a microscope is measuring the items which are being viewed under magnification. [Steve] harnessed the power of a piece of free software called MiCam. One of its features is the ability to select an area of the photograph so serve as the measuring stick. To get the labels seen in the image above he selected the left and right edges of the board as the legend. He used his digital calipers to get a precise measurement of this area, then let the software automatically calculate the rest of the distances which he selected with his cursor.
MiCam is written for Windows machines. If you know of Linux or OSX alternatives please let us know in the comments.
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Alternatively you could just place the PCB with a mm scale ruler on a flatbed scanner. Blow the resulting image up large enough (say a factor of ten). Then print it out and measure directly.