[Christiane] sent in a project prepared at the University of Applied Sciences in Würzburg/Germany. The idea is to experience urban sounds at various heights in a variety of cities. As feet are detected on a step, the experience changes to simulate an increase in altitude. A pair of surround sound headphones, some proximity sensors, an Arduino and instantaudio make everything work.
[JC Doré] sent in this [english] interesting optics hack. The rubber grips are made from an old mouse pad, the springs for the clip were salvaged from zip drive floppy discs. A pair of old photo slide frames sandwich a diffraction grating slide. (Like this one) This simple mod allows the slide to be mounted to most cell phones, turning them into digital spectrometers.
Nikon didn’t build a light metering chip into the D40. That’s fine if you’re using one of their auto lenses with the on-board chip. [Matt] decided to add a sensor to his camera and try it out with his manual lenses. His writeup is a bit challenging to get through, but if you’re really into Nikons, you’ll make it. He had to tap into the ribbon cable inside the body, mount the extra hardware, and add an additional switch outside the body to allow the chip to be turned on and off. The extra sensor adds a bit of a step to taking the shot, but it’s the sort of thing that’ll become second nature pretty quickly.
[btopley] built his own micro mill out of Lego NXT parts. The construction details are a bit light, but it looks like a great way to try things out without all the actual machine work.
Given my obsession of CNC projects, I’m surprised that we haven’t mentioned this project before. [Dave] put together an excellent site about his CNC converted mini-lathe. (The same on that I’ve got) He built a pretty simple stepper controller to drive it. Since the lathe only needed two axis motors, he drove the steppers with some mosfets that he triggered from a parallel port. The site has been around for a while, but I thought you guys would enjoy a classic hack like this one.
It’s been a while since we talked about putting a GPS on top of a D200. [Rick] sent in his latest version. He used a nice 20 channel sirf III gps from spark-fun, a cheap D200 remote cable and a few parts to send the NMEA sentences down the wire. The biggest improvements include taking the $100 Nikon cable out of the mix and swiping power from the camera for the GPS board. All the info is there, but I had to seriously stare at his wiring instructions for a while despite the low parts count. I like to see actual circuit diagrams!