Have you ever involved yourself with the Stepping motor before? For those of you that never have the opportunity, then you should try this project! Since the stepper motors operate differently from normal DC motors, where it simply rotates when voltage is applied to their terminals. Hence, stepper motors are effectively having multiple “toothed” electromagnets that neatly arranged around a central gear-shaped piece of iron. In other hand, the electromagnets that situated in the inner part are completely energized by an external control circuit; example like a microcontroller will be great for it! For making the motor shaft turn, you must supply power to one of the electromagnet, which it will make the gear’s teeth magnetically attracted to the electromagnet’s teeth. Soon after the gear’s teeth are aligned to the first electromagnet, and then they’re slightly offset from the next electromagnet. As a result, each of those slight rotations is called a simple “step”! Basically, this project won’t wasting you too much of time, and this is also the great opportunity for you to test your skill on the Stepping motor as well! [link]
Eagle PCB software is very popular among electronics hobbyists and professional. It is really easy to use and very intuitive. Once you put hands on it you are starting to feel sympathies to it. Seems that Eagle CAD got some serious improvements and is becoming better in control and functionality. With new 5th version of eagle came many new improvements that can make life easier for many PCB producers. Main features would be: The Mac OS X version of EAGLE no longer requires an X11 server, and comes as a “Universal Binary” that runs on PPC and Intel Macs. The Linux version now comes as a a self extracting shell script with a setup dialog. When clicking with the right mouse button on an object in an editor window, a context specific popup menu is now displayed from which commands that apply to this object can be selected. Drawing on screen no longer uses “raster OPs”. The individual layers are now drawn using “alpha blending”.