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Hack a Day

Hack a day serves up a fresh hack each day, every day from around the Web and a special how-to hack each week.
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Programmable spring actuator legs

Sep 5, 2009
This proof of concept shows an interesting way of making robotic legs. They are using programmable spring actuators to make these legs function as though they had a “reflex”.  The builder pulls...

Collect and analyze ECG data

Aug 22, 2009
Although we’ve covered DIY ECGs before, sent in his version that gives an in-depth explanation of what to do with the collected data. He built a basic battery-powered op-amp-based ECG for under...

Toilet paper dispenser

Jul 18, 2009
Solving the age old problem of… wait, what problem are they solving? These students at UC Berkeley have built a toilet paper dispenser prototype. Not only does it meter out an exact amount for...

Cell phone glove

May 1, 2009
Sometimes you find yourself thinking “this cell phone is far to compact and unobtrusive.”

Human powered electric instruments

Apr 28, 2009
[Noah] tipped us off to his work with Physically Engaged Electronic Instruments. He is building instruments, that while being electronic, require physical action to drive them. In the video after...

Servoelectric guitar is a keytar with strings

Nov 6, 2009
has undertaken something of a ‘Mount Everest’ of guitar modifications. He’s developing a Servoelectric guitar that trades frets for a keypad. It is still a guitar in the sense that it has a body, strings, and pickups to sense the strings vibrations and...

Physical email notification

Nov 6, 2009
One day computers will exist in every part of our lives. You’ll be standing in the shower, lathering up  when Chantal, your holographic computer controlled AI partner, informs you in a cool voice you have a new email. How splendid, it must be the...

Cold cathode art piece controller

Nov 6, 2009
built a light box for an exhibition last year that displayed different colors statically. After showing it off, it went unchanged but future improvements remained in the back of his mind. Recently, he pulled it out again and hacked together a...

Didgeridoo modded to include electronic manipulation

Nov 6, 2009
It’s not a bazooka, but this altered instrument makes it look like the player is toking off of some type of weapon. wanted to take the already mysterious sounds produced by a didgeridoo then capture and alter them electronically. The physical build of...

Servo database

Nov 6, 2009
Starting a new robotics project and want to find the perfect servo for the job? It can be a real pain in butt sometimes. This is where ServoDatabase.com comes in. They’re compiling specifications and reviews on servos. We love seeing these databases...


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