Misc Hacks

4181 Articles

USB 2.0 FPGA Based 24 Channel Logic Analyzer

September 27, 2007 by 13 Comments


[lekernel] sent in his USB logic analyzer. I might just have to build this one for my work bench. It’s based on an Altera Cyclone 2 FPGA and he’s provided full schematics, source and a quick and dirty Linux driver to get things going. The board is nearly all surface mount, but he points out that the entire thing was soldered with a standard iron and de-soldering wick. If you’re looking for a good starter FPGA project, this looks like a good one.

I started writing for Hack-A-Day a little over a year ago. I’ve barely taken a break, but for the next week I’m going to be taking some serious time off on a Caribbean island. Thanks for a great year guys! While I’m gone, [fbz] has kindly consented to take over the reins. I’m looking forward to another year when I get back, but right now I’ve got to finish packing my dive gear.

Make Your Own Jacobs Ladder And Other HV Fun

September 26, 2007 by 16 Comments


We’ve covered a few tesla coils, but somehow we never hit this classic – making your own jacobs ladder. The spark climbing the increasing gap between a pair of electrodes is easy enough to create – just get a high voltage transformer (like a neon sign transformer), make a set of insulated electrodes and wire things up.

Now that I’ve mentioned a couple of HV sources, I can point to this set of awesome high voltage photos from the same guy that put together the portable tesla coil.

Convert A DVD-R Drive Into A Lab Scanner

September 25, 2007 by 17 Comments


[bodiby] was first to send in this New Scientist article about converting a DVD drive into a lab scanner. I did some digging and came up with the details. Here’s the paper describing the process and results. Here’s a basic schematic and description of the mod. A set of samples is placed onto a CDR. A photo sensor is used to locate the samples on the CD, while the laser is fired through each sample. A planar photodiode is used to measure the attenuation of the laser as it’s transmitted through each sample. Sadly, I couldn’t find any details on the custom control electronics.

Serial Output For Your Weather Station

September 24, 2007 by 8 Comments


I spent part of my weekend with some sort of stomach virus, so Eliot stepped in for me yesterday. I’m taking next week off, so we’ll have a special guest starting Friday – but I’m not revealing who just yet.

[Fickara] sent in his AVR interface(in Italian) for an Oregon Scientific remote weather station. Thanks to the AVR, data is output via RS232. There are quite a few less expensive weather stations – usually PC output models are over $100, so this could be pretty handy. His page has several other projects including an oscope clock, POV on a stick, etc.

Simple IPhone Headphone Mod

September 19, 2007 by 19 Comments


Apparently the iPhone jack isn’t quite standard – it’s a bit recessed to the point that third parties are offering adapters for it. [John] offers this simple method for modding Etymotic’s fine ER6i headphones. (If only I could find mine. I haven’t seen them for 8 months.) I suggest using a utility knife over a pocket knife. It’s simple, easy, and will probably work on most headphones.

Haptic RADAR: Electronic Whiskers

September 18, 2007 by 22 Comments


[thomph-zhu] sent in this interesting project. If you’ve ever wished for cat like senses, you’ll dig this. It’s a set of electronic whiskers – it uses IR to detect nearby objects, and vibrates against your head upon detection. It’s definitely an interesting use of tactile feedback. The initial idea is for construction safety, but this could be useful for plenty of other applications. (Robotic control, etc)

Copper Multi-tool

September 17, 2007 by 17 Comments


I definitely dig this one. (McGuyver was my favorite show as a kid, and it definitely reminds me of that show.) In order to perform on demand unlocking of doors without bump keys or lock picking, [Dean] keeps a roll of copper wire, augmented with a 1/4 inch bolt. It’s handy for yanking on doors or mounting a camera. Most doors are designed to keep users in, not out…

Update: Here’s a new link.