Automatic Color Detection


[KLOZ] submitted his final project from college. Rather than an expensive CCD camera, he used a set of colored resistors LEDs and a light dependent resistor (I’m assuming he means a photo resistor) to determine the color of a product (m&ms). He used the carriage from an old HP inkjet, a custom cnc cut wheel to separate and deliver the m&ms and a Parallax propeller micro controller board to tie it all together. Now he can hog all the green ones for himself.

Update: Yes, I’m an idiot. I did mean colored LEDs. People who caught me will get an email – I’ve got something for ya.

Check out the sorting demo video after the break

Continue reading “Automatic Color Detection”

Everybody Needs One


Not the hack o’ the day, but you guys might have noticed that I’ve been pretty quiet on the engadget How-To front. I’ve been spending all my spare time in my garage working on a CNC conversion for the mini mill I bought a few months ago. It features pic based microstepping controllers that handle up to 54 volts and 3amps. I settled for a modified PC power supply for now. I’ve got plans for this thing, including some stuff just for Hack-A-Day. All the mechanical and electronic work is completed; now I’m taking a breather while I wait for the actual beefy stepper motor for the Z-axis pictured above. I celebrated with a coffee stout.

Printer Hacking Roundup


Today’s roundup is in honor of all those inkjets, laser printers and plotters that have been cracked open and modded to perform unspeakable tasks. This is a bit of an experiment, so let me know what you think.

First, there’s the classic DIY CD printer. Aside from dremeling the back of the printer, making the cd cartridge from a decent material is probably the most difficult task. I used to print on my DVDs, but now I just rip ’em to my media server.

Not really a hack, but someone discovered that they can get ever nicer photo transfers if they use an inkjet instead of a laser printer to create the transparencies.

Not to be forgotten, using the fuser from a laser printer to transfer laser printed artwork onto PC boards.

If you missed it, [Volkan] and [Stefan] gutted an Epson C84 to make a direct to PCB etch resist printer. The feed the board in and get a printed design, ready for the etch tank. (once it’s dry, of course) Someone else is working on the same hack with a C87.

If you’re evil, there’s the classic paper shredding printer.

You could use an old network printer interface to control something else.

If people you work with actually read the lcd, you might have some fun exploiting the displays on those HP workgroup printers.

You could pick up an old pen plotter and convert it to cut vinyl for your nefarious custom stickers.

Speaking of plotters, there’s the ‘scribbler bot‘ – AKA diy pen plotter.

Of course, maybe you just want to fix your old printer after you completely dissassemble it. (Via zedomax)

Maybe you can make your own waterfall printer. (If you pull this one off, let us know)

USB CNC Controller


This one reminds me of a MAME arcade controller. This control panel is just the gravy on top of a very nice CNC conversion for a Sieg X2 mini mill. (Like mine.) [Hoss] used a Logitech attack 3 joystick and a philips PC game pad to provide the interface. Of course, the case was machined on the mill. The thread covering his conversion provides DXF diagrams of all the parts he used for his CNC conversion, as well as explanation diagrams. (If you need a decent DXF viewer/cad program, try Qcad in the ubuntu repositories.)

Snowboard CNC Machine


Happy new year! I think we’ve covered the DIY CNC stuff a plenty, but I can’t resist posting this one. Remember the DIY snowboard? Recently, quite a few small quantity and home builders have cropped up. (I’m even planning to build my first board later this month.) [Mike Magruder] of happy monkey snowboards built a CNC gantry router just for cutting out wooden snowboard cores. The frame is built from structural aluminum (not cheap) with the usual steppers and some gecko drives running the show. The cable guide track and dust collector even make it look like a professional product. [Mike] also built a sweet press, but I’m going to be using vacuum bagging.

Make Your Own CO2 Laser

We all remember the diy cnc laser. In my quest to bring you guys fresh stuff, I found an interesting design [archived page](the author says he built his in the 80s) for a home-built CO2 laser. The dimensions are missing, but the design is pretty simple. If you like some textbook style reading, the hyperphysics server is your friend. I finally bought a mini mill to go with my lathe – this could make an interesting machining project. Get a mini-fridge compressor to for the vacuum source, and the gas is easily acquired from the local welding shop. I’d bet Surplus shed probably has some workable optics.

The 25th is the deadline for the Design Challenge. Don’t freak out, just get it submitted before I get up on the 26th, and I’ll call it good.