Quick project: Hard drive system meter

[Ginge] sent in this fun little project. He gave himself 3 hours to complete a hack (not including research time) and managed to come up with this cool activity meter. He handles the entire project like it is some kind of contest. Ground rules are laid out, requiring practicality of the final product, minimum investment, and almost complete use of junk pile pieces.

Using an old hard drive for the frame of the project as well as the “dial” part of the meter, he hacked together a system load/ hdd and proc activity meter. The brains of the project are an AVR and he even implemented some PWM to smoothing things out. He goes into some fair detail on the construction of the thing (was the writeup included in your build time? -50 points!). Even though he’s using a piece that he manufactures and sells (OSIF), you could probably figure out how to do it without.

You can see a video of it in action after the break

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Laser microscope projection

looks totally safe to me

Ok, we’ll start this off by saying, looking at lasers can damage your eyes. Be careful. Now that we’ve got that absolutely clear, we couldn’t help but find this super quick and dirty laser microscope fascinating. Basically, they are just pointing a laser through a drop of water suspended from the tip of a syringe. The image of the contents of the drop are projected on a nearby wall. The drop seen in the video after the break was taken from a potted plant and you can see all kinds of life squirming around in there. Just don’t try it with this laser.

[via HackedGadgets]

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Don’t worry occifer, there is no blood in my alcohol!

[Daniel] wrote up a quick tutorial on interfacing with the MQ-3, or better known Breathalyzer from SparkFun with Arduino. While we would have used perhaps an op-amp/comparator based system and kept it in a much smaller package, the idea was so quick and simple and enjoyable we hoped an article might keep some hackers from drinking and driving.

[Thanks CletustheYokel for pointing out our silly category mistake.]