Connect your MS-DOS/Windows PC to the real world with this bestselling book! Control stepper motors, turn appliances on and off, monitor fluid levels, control a home security system, convert thermometer readings to digital values, detect magnetic fields, and do other useful stuff with the circuits and software found in this book. All circuits connect directly to the parallel printer port of your PC--you don't have to modify your PC in any way. Each circuit is complete with a schematic, description of circuit theory and operation, a parts list, construction and usage tips, and full source code in C, Basic, and Pascal for the controlling software. You can use each circuit "as is" or modify it for your particular needs. Do as thousands and thousands of others around the world have done--add this book to your electronics reference library! Over 200 large-format pages plus HD floppy disk.