Posted March 6, 2015 by Chris

"I recently finished a project to turn the Raspberry Pi into a music streamer….I knew it was possible, and I wanted to try to figure it out by myself. My basic justification for the project was that I listen to a lot of music on Pandora or Spotify while reading and doing homework.."

Posted March 5, 2015 by Chris

"This is a simple 6 port USB device charger with a individual current monitor on each port. The charging current is indicated using RGB LEDs. Blue means slow charge, green means 250mA to 750mA, red means over 750mA, and purple means over 1500mA. This circuit involves an ATmega328P, INA169, and a OKR-T10-W12."

Posted March 2, 2015 by Chris

"…when, with no humans in earshot to ask, I figured I would build a Magic 8 Thing and ask it if I could procrastinate any longer. Was this a lack of motivation to repair a cellphone charger or was it motivation to make a Magic 8 Thing. Irrelevant really as I got both things done in about 10 hours this weekend."

Posted March 1, 2015 by Chris

"Capacitive sensor is a technology sensing proximity position based on capacitive coupling. There are many different methods for producing a capacitive sensor. A simple one way to form an on-off output is by using two layers and a spacer in between. Through a voltage to conductive objects causes positive and negative charges to collect on each object."

Posted February 28, 2015 by Chris

"The key I made works beautifully both on my garage door, as well as on a number of other readers I tried. I have decided to publish this, as more people should be aware of the design flaws that are inherent in older RFID implementations, and to allow others to make their own universal key."

Posted February 26, 2015 by Chris

"Keyboards are useful because many kinds of software can be controlled with keyboard input. We can build a physical interface that doesn’t look like a keyboard, and still pass keyboard commands from it to Flash. This technique has been used at Interaction-Ivrea in a number of interesting projects."

Posted February 25, 2015 by Chris

"This is an experimental work to monitor a spectrum pattern in radio band, and is a continuous project from Audio Spectrum Monitor. To analyze the spectrum of an input signal, I chose an Atmel AVR microcontroller that used in the Audio Spectrum Monitor to process FFT."

Posted February 25, 2015 by Chris

"OpenQCM is a highly sensitive microbalance with a wide range of applications in chemistry, biology and material science. The sensor is a surface sensitive quartz crystal capable of measuring phenomena at molecular scale. It works in vacuum, air and liquid environments. OpenQCM is an open hardware project with Arduino inside its heart. It’s a scientific as much as a friendly device very quick and easy to use."

Posted February 24, 2015 by Chris

"This project describes how to read the speed of a PC fan using Arduino board. It’s a good introduction to reading pulse duration and driving 7 segment led displays on Arduino. The text is written in Japanese but the link below will auto-translate to English."

Posted February 23, 2015 by Chris

"…But, could chemical reactions in fruits be also used to create on-off switches, the basic building blocks of computer logic and memory? Would it be possible to create a computer with fruits? This project proposes to create a temporary laboratory, open to the general public, that will raise questions and reflections about the construction of a future computer based on fruits."