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The Etchinator - low cost PCB spray etcher (under $100)

What/Where/Why/How? What is etching and what is spray etching? Etching is the process of eating away a pattern on a target material by using an etchant liquid that attacks the target material. The...

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Arduino Laser Tag - Duino Tag

Duino tagger- General introduction Duino tag is a laser tag system based around the arduino. Finally a laser tag system that can be tweaked modded and hacked until you have the perfect laser tag system...

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Control an Arduino With a Wristwatch (TI eZ430 Chronos)

The watch The Texas Instruments eZ430 Chronos is a cool gadget. It has bidirectional radio communication, and a whole bunch of sensors: temperature, pressure, acceleration. In fact, it is a development...

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Build a Thermal Flashlight - Light Painting with Temperature

Inspired by the Public Laboratory and having just finished a round of college applications, I decided to experiment with thermal imaging on the cheap. Thermal cameras are expensive. Even at low...

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Make a working lock and key

In this instructable I'm going to run through the process of making a working 5-lever mortice lock and key. Steps 1 & 2 are an overview of 3D printing requirements and how the mortice lock works,...

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Build a Laser 3D Printer - Stereolithography at Home

Here is how to make a Stereolithography 3D Printer. It is still a bit of a work in progress but so far it is working pretty well. This is mainly an experiment which started as a Delta Robot...

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Wall Sconces with Hidden Weather Display and Tangible User Interface

Videos of project in action below!!! Disclaimer: This is an abbreviated description of the project since I did not have time to do a full step-by-step instructable in time for a contest. However, I...

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Animatronic Tentacles with Arduino

***Disclaimer***This instructable is documentation for a work in progress. Although the project is not yet complete, it has reached a place where I believe it can begin to be beneficial to other...

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How to Make a Coaxial Air Cannon

This video shows how I make a compact 2" bore air cannon with a coaxial piston valve. To understand how these valves work examine the third animation in the following link:...

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air horn office chair prank

The office is a great place to prank your coworkers. Interrupt the white noise of typing keyboards and the hum of the photocopier with a blaring klaxon hidden under someone's office chair. This is the...

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How to make an affordable 'Vein Finder', for use during venipuncture

One of the hardest parts of taking blood can be finding a suitable vein. Some patients are 'difficult sticks'; their veins are either very small, and/or deep, preventing health professionals from...

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Pysanky - Ukrainian Egg Dying

Pysanky is a traditional craft in Ukraine and Poland. The method is similar to batik - patterns are drawn on the egg with wax, which then protects the covered areas from the dye that is applied. By...

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How to build a Multi-Touch surface

Multi-touch gestures are the latest and greatest way to interact with your computer.  However, commercial systems are not widely available and are expensive.  Fortunately, you can do it yourself better...

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The Complete Guide to RC Electronics

Hello, my friends. I have often found hobby RC electronics to be of interest in my projects due to their apparent simplicity and ease of use. However, it took me a while to figure out how to put...

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Glass nixie

A Nixie tube is an electronic device for displaying numerals or other information using glow discharge. But they need about 200 volts to glow and it makes them dangerous and difficult to drive, at...

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Arduino Combination Door Lock: Lockduino

Ready to put a combination lock on your door to keep out intruders? You've come to the right place! In this i'ble I will show you step by step how to make a combination lock for your door! Watch this...

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Arduino RFID Lock

The Arduino RFID lock How does it work? The Arduino RFID lock is a lock that can be opened easily, but is secure. The lock works with a server database that can register card codes. On the door there...

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How-To: Make an RGB combination door lock

Putting a custom designed electronic lock on your space seems like a geek right of passage. For our latest workspace, we decided to skip the boring numbered keypad and build a custom RGB backlit keypad...

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3D Printed Sound Bites

After I posted my 3D printed record project, I received an interesting comment from Instructables author rimar2000.  He described an idea he's had for a while about a strip of material that has audio...

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Ice Cream Sandwich Recipe

Homemade Ice Cream Sandwiches?  Yes, please! Make your own flavor combinations with this easy Ice Cream Sandwich recipe!  I like ice cream sandwiches any time of the year, but I find the basic...

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