Here is a nice 3D model of arduino board made by ”Bussoli” using Google SketchUp. Bussoli writes:
What I haven’t been able to find were any physical representations of the board itself that I could use for things like case modding or fabrication. So I decided to model the board in Google Sketchup myself and post it for everyone to use.
Arduino Sketchup Model - [Link]
This project is a robotic arm made mostly from Wood. It cost less than $50 to make and has alot of the functionality that any normal robotic arm would have. It is controlled by a PIC Microcontroller and cloned PS1 controller.
Robotic arm made mostly from wood - [Link]
The 3D LED Cube was a project started by Gene Foulk and www.lomont.org to create a large, animated, self contained visualization cube of LEDs, mostly for artistic purposes, but it also would have other uses.
The 3D LED Cube - [Link]
The RGB LED contains three LEDs encased in one shell: Red, Green and Blue (some contain an extra blue led – as blue LEDs generate less output intensity (candela) per mA). It looks like a single white led except that it has four leads – one for the common ground connection and one for each led.
The average current through each of the LEDs determines it’s light output i.e. its contribution to the total output color. So by controlling the average current through each LED you can create almost any other color.
How to drive an rgb led using three microcontroller pins - [Link]
Laser Flashlight Hack! – video powered by Metacafe
Kipkay extracts the laser from a DVD burner and mounts it in a small flashlight to create a handheld laser burner that can light matches and burst balloons. Hit the play button to see how he did it.
ATTENTION: Your burning handheld laser could pose a safety risk to humans, especially when pointed at eyeballs. Watch your kids, proceed at your own risk, treat as you would a weapon, etc. Thank you.
Turn a flashlight into a handheld burning laser – [Link]
That’s a really nice LC Meter Based on the AVR Microcontroller. It calculates and displays L and C from oscillation frequency using reference components. No relays, no range switching, a minimum of controls. And it is pretty accurate too! The 2 line x 16 character LCD shows the calculated inductance and the oscillation frequency. The frequency might be of interest because inductors with cores can appear to vary in inductance with changing test conditions.
A Pretty Good LC Meter Based on the AVR Microcontroller - [Link]
That’s a very nice square dot red led display found on ebay. Forward Voltage = 1.8V ~ 2V DC, Maximum Forward Current = 20mA.
[Ebay] 5*7 square dot-matrix LED display – [Link]
Here is a really cool item!!! These are new high resolution full color led display modules that were manufactured for the gaming industry to be used in slot machines and other similar gadgets. These displays are comprised of a 24 x 72 matrix of tri-color leds…that’s 1728 3.6mm rbg leds. The leds are spaced 5mm on center…as far as led displays go, that’s pretty tight.
[Ebay] 24X72 matrix RBG Led display - [Link]
That’s an amazing ethernet controlled LED matrix made from 10 SLM1608 (SLM1606) LED matrix display units. These are 16×16 LED matrix units with a green and a red LED per pixel allowing each pixel to be switched to either green, red, amber or off. The goal of this LEDMATRIX project was to build a 80×32 pixel display by arranging the displays in two rows with 5 displays each giving a total of 16*16*2*2*5 = 5120 LEDs to be controlled individually. The ethernet support of LEDMATRIX is based on the cirrus logic cs8900 chip which is e.g. supported by the free Procyon AVRlib which has been used for this project. The unit is based on a ATmega32 microcontroller.
This whole project is open under the GPL. This means that you get full access to the firmware source code as well as to the schematics and the PC companion software.
The LEDMATRIX interface - [Link]
Attach any I2C client chip (thermo sensors, AD converter, displays, relais driver, …) to your PC via USB … quick, easy and cheap! Drivers for Linux, Windows and MacOS available.
The i2c-tiny-usb project is an open source/open hardware project. The goal of i2c-tiny-usb is to provide a cheap generic i2c interface to be attached to the usb. It is meant as a replacement for those simple and cheap printer port to i2c adapters. A USB solution has several advantages incl. the built-in power supply and a more future proof interface. Furthermore no cpu intense bitbanging is required on the host side. This USB solution even requires less parts than some printer port solutions.
While the i2c-tiny-usb was developed under and for Linux it also works under Windows and MacOS X. A windows demo driver and demo application is included to get you started immediately.
I2C-tiny-USB project - [Link]