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Computer Interface Circuits

Computer Interface: 
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Last Updated: October 24, 2017 02:54 PM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

PAL Controls Simple Circuit Dual Port Memory 04/27/95 EDN-Design Ideas The PAL-based dual-port RAM in Fig 1 replaces more expensive circuits based on the Intel 8207-8 programmable memory controller.  Fig 1 shows a 32-kbyte, dual-port memory.   __ Circuit Design by Jayapandian, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, India

PAL Facilitates In-System Programming 03/01/96 EDN-Design Ideas The advantage of in-system programming is to provide software updates or changes in system configurations without any component changes.     __ Circuit Design by YS Tam Canadian Marconi Co Ottawa, ON, Canada

PAL Powers Universal ISA Bus Interface 02/02/95 EDN-Design Ideas A pc board bearing the 16-bit ISA data-bus interface in Fig 1 can adapt automatically to either 8- or 16-bit motherboard slots.  The interface comprises three bidirectional octal buffers and glue logic.   __ Circuit Design by Jerzy R/ Chrzaszcz  Institute of Computer Science, Warsaw University of Technology, Nowowiejska, Warsaw, Poland

Palm-Top/Hand-Held to RS-232 Serial Converter This document details how to build your own SHARP palm-top/hand-held to RS232 serial converter.  In summary, this device allows the SHARP range of hand-held computers and pocket organisers to be interfaced to (almost) any computer which has an RS232 serial port i.  e.  IBM-PCs (or compatibles) , Amigas, SUNs, other UNIX machines, etc __ Designed by Andrew Woods

Parallel AVR Programmer This programmer is designed to program Atmel AVR microcontrollers in either parallel or serial mode, while connected to a host machine using RS232.  It's controlled by an 8051 (actually developed using a Dallas DS5000) and should work with most variants, since it doesn't use any special features.   __ Designed by Adrian Fangorn

Parallel Port Central information on using PC parallel port for I/O and Windows drivers for that, useful for your own circuit interfacing  

Parallel Port Controller Control Appliances Through a Computer

Parallel Port Controller using Matlab This project demonstrates the programming of PC's parallel port using Matlab and implementing the same to control a stepper motor and LEDs from the parallel port.   __ Designed by Electronics Projects for You

Parallel port controls arbitrary-waveform generator 06/13/02 EDN-Design Ideas You can use the parallel port of your PC and a few additional components to generate a powerful, easy-to-use arbitrary-waveform generator.  By using a Visual Basic program with the circuit in Figure 1, you can generate any waveform(for example, sinusoid, triangle, amplitude- or frequency-modulated, or exponential decay] by simply entering its characteristic equation __ Circuit Design by Art Kay, Texas Instruments Inc, Tucson, AZ

Parallel Port Interface Card A Windows-based program makes this simple I/O card easy to drive.__ SiliconChip

Parallel Port Interfacing Made Easy PC parallel port was never designed to provide any output power to divices connected to it.  it was only designed for connecting printer to your PC.  But in this weird PC business everything changes.  Suddenly the parallel port have become a port where you can connect very wide selection of devices like software protection dongles, removable disks, modems, network adapters, printer sharing units, parallel port extenders, soundcards, electronic telecard readers and many homebuilt circuits __ Designed by Tomi Engdahl

Parallel port powers Simple Circuit A/D interface 10/23/97 EDN-Design Ideas If you have to sample just a few low-rate analog signals, or your PC's slots are all full or too outdated for the newer data-acquisition products, a simple interface may be all you need.  You can build such an interface that requires no external power supplies or adapters(Figure 1).  This design __ Circuit Design by David M Acre, McDonnell Douglas Aerospace, St Louis, MO

Parallel port provides high-resolution temperature sensing 10/03/02 EDN-Design Ideas Simple tester checks LCDsHigh-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 __ Circuit Design by Martin Connors and Mike Foote, Athabasca University, AB, Canada

Parallel Port Relay Interface Below are three examples of controlling a relay from the PC's parallel printer port (LPT1 or LPT2).  Figure A shows a solid state relay controlled by one of the parallel port data lines (D0-D7) using a 300 ohm resistor and 5 volt power source.  The solid state relay will energize when a "0" is written to the data line.  Figure B and C show.   __ Designed by Bill Bowden

Parallel port replaces embedded µC 07/08/98 EDN-Design Ideas 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[File contains multiple circuits.    Scroll to find this one.  ]Design Ideasby Eli Kohav and Leonid Grossman, ECI Telecom, Petah-Tikva, Israel] __ Circuit Design by Eli Kohav and Leonid Grossman, ECI Telecom, Petah-Tikva, Israel

Parallel Printer Port Interface This is the basic interface I used as part of my Computerized Room project.  This is the parallel interface only.  The 8 bit input card can be found, along with the rest of the project, at Computerize Your Room/House.  This interface, as well as the other two interfaces, came from the book "The Robot Builders Bonanza", by Gordan McComb.  This interface is also useful for controlling small robots, etc.   __ Designed by Aaron Cake

Parallel-Printer Adapters Find New Use as Instrument Interface EDN-Design Ideas 06/22/95    The venerable parallel-printer adapter has found many uses during its long lifetime.  Now, you can use the port as an instrument interface-for connecting a photometer and a PC, for example.  Designers of the Centronics, or parallel, printer adapter intended it as a way to connect printers and computers.  However, the adapter's uses go far beyond simple peripheral connection.   __ Circuit Design by Dhananjay V Gadre, Inter-University Centre for Astronomy & Astrophysics-- 6-22-95

Part 1-Atmel AVR Infrared Downloader-Host-side. This project makes firmware upgrades easy: The target has an Infrared receiver and the data is sent via IR.  The IR transmitter is based on V-USB.  The host-side consist of host-program for Win32 PC using LibUSB-Win32 , device based on ATmega8 using

Part 2-Atmel AVR Infrared Downloader-Target-Side In the first part we have considered a circuit design and software of Host-part.  The target-side consist of device minimum system based on ATmega162 and infrared hardware unit.  Device minimum system consist of ATmega162, external SRAM 8 kbyte and

Passive Ethernet Hub I tested this concept on a little network consisting of three PCs running under Windows 2000.  It works well.  The network adapters are normal Intel and 3Com models, set to 10 Mbps and Half Duplex.  The computers are labelled A, B, C, and the UTP cables from the computers to the hub are 10, 16 and 35 meters long, respectively. __ Designed by Miroslav AdzicSerbia & Montenegro

PBUS, multi-drop RS422/485-type network for interconnecting PIC nodes PBUS is an RS485-like multi-drop bus for interconnecting PIC and other microcontroller-driven devices.  Protocol and software is written by Jap.  Just include a separate pbus library file into your project and add your command handlers for the specific device in a few lines __ Designed by Peter Jakab

PC & DACs generate two Simple Circuit analog outputs 10/14/00 EDN-Design Ideas The simple and inexpensive circuit in Figure 1 generates two PC-controlled analog reference voltages.  You supply a wall-adapter supply and a parallel connector, and the circuit is ready to run.  The circuit uses two 12-bit AD7243 DACs, which require only one supply voltage.  These converters also include internal references, minimizing the number of external components.   __ Circuit Design by  Jim Terrade

PC & DSP µP Interrupt Each Other 06/09/94 EDN-Design Ideas Efficient synchronization and communication between a PC bus and an add-on board is important for virtually all applications—but is essential to DSP boards such as those that use the TMS320C25.  A bidirectional register mapped in I/O space at the DSP side and decoded in I/O channels at the PC side provIdeas this efficiency and is simple and flexible.  Listing 1 describes control logic for such a register encapsulated in a low-cost GAL20V8 that allows for polled and interrupt-driven service. __ Circuit Design by Jerzy R Chrzaszcz, Institute of Computer Science, Warsaw, Poland

PC / Laptop to MP3 I rustled up this simple electronic circuit of necessity.  It takes audio straight off the Internet, and puts it on a digital recorder.  There are various advantages to this, not least that one can pull the audio off any computer without having to have this or that software in place first.  Note that this is a digital-to-analog-to-digital conversion, so the sound will only

PC 12v Adapter This circuit provides a short circuit protected power supply from PC 12V supply voltage.  This is particularly handy when working with PC interfacing projects.   __ Designed by M Asim Khan asimkhan @ sat.net.pk

PC Acts as RS-232C Protocol Analyze 09/29/94 EDN-Design Ideas The circuit in Fig 1 is an inexpensive and easy-to-build PC-based alternative to a dedicated protocol analyzer.  The circuit taps into an RS-232C line between J1 and J2, and IC1's charge pump converts the RS-232C signals to CMOS levels.   __ Circuit Design by Michael Cortopassi, Dauphin Technology, Lombard, IL

PC Audio Signal Generator using RS232 Port Using an RS232 port, we can generate square wave oscillation when transmitting data, and this can be “misused” as signal generator (square wave generator).  This is a PC Signal generator produce a square wave in audible frequency range.  This circuit utilize a transmission of a “U” character from ASCII character set.

PC Automatic Power-on This project is a power-on boot sequencer that works with PC-style computers such as an ATX or Mini-ITX system.  These computers use power supplies which stay partially energized and can be enabled with a low voltage switch closure.  Some computers have built-in BIOS functionality that can be set to boot up the computer when AC power is applied, others do not.  This circuit is intended for the latter type of computer. __ Designed by G. Forrest Cook

PC based 7 segment rolling display It is very interesting and convenient to be able to control everything while sitting at your PC terminal.  Here, a simple hardware circuit and software is used to interface a 7-segment based rolling display.  The printer port of a PC provides a set of points with some acting as input lines and some others as output lines.  Some lines are open collector type which can be used as input lines.  The circuit given here can be used for interfacing with any type of PC’s printer port

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.

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