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Hack A Day (7 unread)

Answers.hackaday.com is LIVE

Posted: May 4th, 2010, 2:51pm MDT by Caleb Kraft

Quick, go to answers.hackaday.com and sign up for an account. Ages ago, we announced that we would be bringing a community driven question and answer system to Hackaday. We eventually got tired of waiting for the feature to be provided and improvised. Well, the wait is over. You can now post your own questions and [...]
Paintball graffitti

Posted: May 4th, 2010, 1:01pm MDT by Mike Szczys

Paintball as a large format printer? That’s exactly what facade printer is. A paintball gun was mounted with two controllable axes of movement. A computer reads in the image data and prints it out by shooting paintballs to form a dot-matrix display. There’s a couple of wins here, the paintball paint can be washed off, [...]
Laser Command game uses laser for control

Posted: May 4th, 2010, 12:00pm MDT by Mike Szczys

[Eliji Hayashi's] project for a class at Carnegie Mellon University is absolutely delightful! It is a game he calls Laser Command because a laser pointer is used as the gaming controller. An 8×8 LED matrix serves as the display, but is also used as an 8×8 light sensor, much the same way as the LED [...]
Print toner directly to a PCB

Posted: May 4th, 2010, 11:00am MDT by Mike Szczys

We use the toner transfer method to fabricate printed circuit boards. The most difficult part of this is printing, ironing, and removing the paper from the toner that is used as an etchant resist material. [Mark Lerman] is developing a method to apply toner directly to the copper clad using a laser printer. Each of [...]
QFN or MLF soldering without solder paste

Posted: May 4th, 2010, 9:00am MDT by Caleb Kraft

Take a few minutes to watch this amazingly informative video on how to solder QFN or MLF components without solder paste. The quality of the video and the information within is quite nice. Even if you don’t intend to work with these parts, you could pick up some tips for soldering with hot air.
EMG controlled prosthesis

Posted: May 4th, 2010, 8:10am MDT by Mike Szczys

This prosthetic arm is the result of a student project. [Amnon Demri] and his classmates built it with below-the-elbow amputees in mind. It uses electromyography to actuate the fingers and wrist. Four stick-on sensors are placed around the elbow to sense electrical activity there. These signals are interpreted by a PIC 16f877a microcontroller which then [...]
POV LED sphere

Posted: May 4th, 2010, 7:29am MDT by Caleb Kraft

[Csaba Bleuer] has built this really nice POV LED sphere. Looking at the hand drawn schematic, it appears that he’s using an Atmega8 as the core. The resolution is pretty decent, and even shows fairly well on camera despite the refresh issues. Although much cleaner, it looks like a similar implementation to this one that [...]