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Micro FM Transmitter


This circuit is commonly credited to Japanese multimedia artist Tetsuo Kogawa. It takes audio input through a 1/4″ phono jack and, constructed as shown, without the optional antenna connections, will broadcast an FM radio signal about 30 feet. This is the standard model of Mr. Kogawa’s simplest FM transmitter, which... Read more »

Using the Parallax RFID Reader with an Arduino


If you’ve ever wanted the ability to use some form of hardware-based authentication in your projects then this is the board to do it with. The Parallax RFID (Radio Frequency Identification) reader is super easy to configure. It only takes four wires! It uses serial protocol to transfer information from... Read more »

Networked On Air Light


You may have seen those “On Air” lights at film, radio or television studios. Now that anyone can broadcast video over the internet, it’s time to learn how to build your own “Now Streaming” light that even wirelessly checks to see if you’re streaming! This guide will show you how... Read more »

Tweet-A-Watt Power Monitor


By Limor Fried and Phillip Torrone We live in a rented apartment, so we don’t have hacking access to a power meter or breaker panel. But we still wanted to measure our household power usage long-term, so we developed the Tweet-a-Watt. It uses plug-in electricity monitors at each outlet to... Read more »

Easily Control Ambient Lighting with Your Smartphone


If you're looking to jumpstart an ambient lighting project and could use a controller with out-of-the-box iOS and Andriod support, you might want to check out the iGloLEDset from MEA Mobile. They've currently got a 5V kit that comes with a nice iOS/Android app to mix color gradients on-the-fly from... Read more »