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31 Jul 2008

The base processor is a PIC16F876, which is a 28-pin PIC processor, running at 20MHz. It is paired with an LMD18200 H-bridge, which can drive 3A continuous loads, 5A peak.The interface using serial mode at 19,200 baud, and uses standard text commands. [via]

Designing a PID Motor Controller – [Link]

31 Jul 2008

This project is a homebrew 12bit 24KHz homebrew USB soundcard based on a pic18f2550 and a few Microchip analog parts. The project is based on the Microchip USB framework, but the core audio processing is written from scratch. The card is a duel Audio 1.0 + generic interface composite device with the generic interface being handled by WinUSB. The schematic, card firmware, and host C++ software is provided. [via]

USB Audio Streamer : A Microchip PIC based USB sound card – [Link]

31 Jul 2008

The counter is sensitive enough to detect background radiation. In addition you can enhance the basic Geiger Counter by adding a Digital Meter Adapter, RS-232 Adapter with free Windows Radiation monitoring program or a Randam Number Generator. The windows 98/XP radiation program is free and available for downloading. [via]

Build Your Own Geiger Counter – [Link]

31 Jul 2008

The goal of this project is to provide as complete of a resource as possible for people interested in getting into creating artwork incorporating LED lighting. A secondary goal is to provide basic information on general engineering practices for creating standalone LED art. [via]

Ultraluminous LED Light and Art Projects – [Link]

31 Jul 2008

This is a simple signal generator which produces sine waves (or any waveform really) at audio frequencies using DDS and is controlled a USB serial connection.Only 2 chips are used in this circuit. The AVR ATmega88 which produces the signal, and an FT232R for the USB interface. While a computer is required to control the varying frequency of the oscillator, a fixed frequency project could be made without the USB interface. [via]

USB controlled DDS signal generator with ATmega88 – [Link]

31 Jul 2008

Here is an experiment with an 8×8 LED matrix, driven by a MAX7219 IC, controlled through an Arduino micro-controller board. A custom PCB has been made by Tan from DinoTech to tidy up all the wires connecting the LED matrix and the IC. It comes with a separate 12V power supply, in order not to drain everything from the Arduino board. [via]

Arduino with 8×8 LED Matrix – [Link]

31 Jul 2008

The length of the sleep cycle varies for each person, and averages about 90 minutes. I wanted to try to measure the length of mine, without having to wake up and check a clock. I also wanted to get an idea of how much I naturally move around during the night, and what patterns I might find therein. [via]

Sleep Tracker – [Link]

31 Jul 2008

The RMS G-meter is a microprocessor-based device that displays and updates in real time the RMS values of the acceleration levels to which it, itself, is exposed, in one axial direction.

This device consists of a single-axis accelerometer, signal conditioning/filtering, A/D converter, micro-controller, LCD display, and battery power supply. Once turned on, the user may first select either Peak mode, Average mode, or Integrated RMS mode. In the Peak Mode, the device updates the highest RMS value it has measured since it was activated. In the Average mode, the device simply displays the averaged RMS value of signal over the entire time it has been active. In the Integrated RMS mode it reports the sum total of all RMS samples computed since activation (total integrated RMS). [via]

RMS G-Meter – [Link]

31 Jul 2008

A touch sensor developed for use in a range of projects for fabrica interactive. The sensor is designed to take a reading and then communicate that reading digitally so that the sensor can be placed at a distance away from whatever is reading it (A microcontroller / other physical computing interface)

The sensor can be used with conductive ink that can act as an input area once its been applied to any appropriate surface. (windows, plastic, etc) [via]

Fabrica Touch – [Link]

28 Jul 2008

As Oil prices going up and seems this is going to keep that way, more and more attentions is given to alternative energy sources. Probably solar energy is most attractive due to its nature. Don’t go in to discussions about what alternative energy is the best – all of them are good as long as they are effective.

Researchers in University of California, San Diego have been working on “hairy” solar cells. They discovered that growing nano-wires on photocells boost solar cell efficiency. Nanowires help to conduct electrons from collections surface to electrode.

Higher efficiency solar cells with nano-wires – [Link]





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