Parallel Port Interfacing Made Easy:  (electronic schematic / circuit added 11/05)

Parallel Port Powers Simple A/D Interface :  10/23/97 EDN Design Ideas /  (added 11/05)

Parallel Port Provides High Resolution Temperature Sensing:  10/03/02 EDN Design Ideas  /  (added 1/05)  High-resolution temperature sensing at low cost is possible using only one chip attached to the PC's parallel port (Figure 1). The Dallas Semiconductor (www.dalsemi.com) DS1722 digital thermometer allows measurement resolution as fine as 0.0625°C in digital form and with linear response. The accuracy specification is only 2°C, but you can improve this figure by careful calibration....

Parallel Port Relay Interface:  (electronic circuit added 4/05)

Parallel Port Replaces Embedded µC:  07)/08/99 EDN Design Ideas  / (added 11/05) [Note: File contains multiple circuits.  Scroll to find this one.]  Many applications use an embedded processor, which has certain needs: software, RAM, ROM, board space, and others. Frequently, another host computer, usually a PC, controls the application. Using a single CPLD, you can dispense with the embedded processor and let the PC directly control your system via the PC's parallel port (Figure 1). The CPLD mimics the address, data, and control buses of a standard µC, such as an 8052, so you can use standard µC interfaces and peripherals in your system. The advantages you glean from this arrangement....

Parallel-port Debugging Aid:  A useful device which can be built (if you're patient enouch )into the shell of a DB-25 connector. It provides simple visual indication of 8-bits of data useing LEDs and provides three inputs, via switches. Plug it into a parallel port on your PC and then imbed special instructions in your code to provide visual feedback, simliar to a "PORT 80" card. (circuit design added 7/06)

PBUS Multi Drop RS422/485 Type Ne2 Rk for Interconnecting PIC Nodes:  (schematic / circuit added 10/02)

PC Acts as RS 232C Protocol Analyzer :  09/29/94 EDN Design Ideas /  (added 11/05)

PC and DACs Generate Two Simple Analog Outputs:  10/14/00 EDN Design Ideas  / (added 5/05) 

PC and DSP µP Interrupt Each Other:  06/09/94 EDN Design Ideas /  (added 11/05)

PC Based 7 Segment Rolling Display:  (electronic Circuit / Schematic added 10/04)

PC Based Configurable Filter uses No Digital Potentiometers:  01/23/03 EDN-Design Ideas  / (added 3/03)   Modern instrumentation requires digital control signals. These signals come from a central microprocessor or, in modern context, the popular parallel or serial PC ports. In recent times, digital potentiometers have eliminated the hassles from this interface for the analog section. Designers can replace the resistors of the analog design with digital potentiometers, thus providing the necessary digital control....

PC Based Frequency Meter:  Here is a simple technique for measuring frequencies over quite a wide frequency range and with acceptable accuracy limits using a PC. It follows the basic technique of measuring low frequencies, i.e. at low frequency, period is measured for a complete wave and frequency is calculated from the measured time-period. Cascadded binary counters are used for converting the high-frequency signals into low-frequency signals. The parallel port of a computer is used for data input from binary ….  (added 10/05)