[Jerome] sent in this awesome Muffin maker (yes, muffins) that [Carl Boucher] and [Dominic Dussault] built for [Carl]’s final project in his Industrial Electrical Technician program. No real technical details, just some tasty inspiration. If you prefer cookies, you might want to check out fabbing with Nutella.
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Make An ECG With Your Sound Card
[Marcus] sent in his work on making ECGs. His first one was inspired by [Jason]’s. Believe it or not, you can build this thing for under $5. After getting it semi-functional, he decided to pick up a cheap one and mod it for PC input via the sound card. (There are plenty of sound card oscilloscope projects that will work for this.) Remember kids, don’t go sticking electrodes on anyone unless you know what you’re doing: correctly placed electrical shocks (even low power ones) can be deadly.
LCD Projector Repair
[Kieth] picked up an Infocus projector only to find that it needed some repair. The polarizer on the blue light path was toast. When he parted out an Optoma projector he scored a polarizer that was just about right for the repair. It’s a good read even if you don’t have a projector in pieces at the moment. He ended up bending the mounting bracket a bit to hold the filter and got his projector fully up and running again.
PIC Controlled Spray Paint
Most people make LEDs light up for their first microcontroller project. [Alex] built a “large scale dot matrix printer.” This beast is a PIC controlled ground graffiti machine. As it rolls across the ground it deposits strategically located bits of spray paint. Rather than use actual spray paint, he opted for a set of solenoid controlled nozzles that shoot the paint downward.
Biggest Drawing In The World Created With GPS
UPDATE: The text: “This is fictional work. DHL did not transport the GPS at any time” has been added to the bottom of the page since the original posting.
Artist [Erik Nordenankar] has created the Biggest Drawing In The World. At least that’s what his URL says. He used the movement of a GPS device to create a giant single line self portrait on the globe. His Pelican case containing four large batteries and the GPS data logger was handed off DHL with very specific travel instructions for its 55 day journey. It’s a pretty amazing feat, but we really wish the case had managed to make the trip without the close watch shown in the video.
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Lumenlab’s New Kit: Open Source CNC
Imagine our surprise when we stumbled on the latest Lumenlab project: gantry style CNC. Until now the only time we ever invoked their name was for DIY projectors. The kit looks pretty interesting, and they’re taking pre-orders right now. It’s designed for a full sized router and you should be able to cut a 4′ by 8′ sheet with a feed roll. Even without, the cutting area is a large 26″ by 50″ and features 8″ of Z movement. Between their kit and an order from Online Metals, they’re projecting that you can build your own for around $1000. We’re definitely in when the final kit is released in June.
How-To: Go Green With Lead Free Solder
We covered many of [Jason Rollette]’s personal projects in the past and are happy to welcome him as our newest Hack-A-Day contributor.
The electronics industry has shifted to lead free compliance, but most hobbyists haven’t even considered the personal impact of using lead. Today’s How-To will cover what it takes to switch from tin/lead solder to completely lead free. Our previous posts Introduction to soldering and the follow-up still apply to lead free. You may have never considered switching to lead free before, but we hope to help you make an informed decision.
