Ultrasonic Radar for a Home PC System One of the fastest changing and most expensive fields, is that of technology. Our computers, printers, modems, and much more is being outdated faster than anything else in the world. Just as we buy a new computer that does what we want, the industry comes out with a new option on a smaller and better computer. There seems to be so much changing that unless we invest our life savings into technology, we are considered obsolete like our computers. What used to fill an entire room, is so small now that it can be swallowed with a glass of milk. A computer used to be a mechanical engine that had many moving parts and was very