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Computer Interface Circuits

Computer Interface: 
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Last Updated: December 25, 2017 01:47 PM

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

E10-G RS232 Modem How to connect a PC RS232 moden to you Pocket PC__ © Vassilis Serasidis

Easy Debugging Terminal This LCD terminal provide two modes of operation by selecting jumper J1.  When J1 is open the terminal operate as a normal ascii display terminal, when J1 is closed the terminal displays the input serial data in hexadecimal format.  This mode is useful for viewing raw data from the serial port output __ Designed by Wichit Sirichote

Easy-Downloader V1.1 Serial interface programmer board for writing intel HEX file to the AT89C2051/4051 flash based microcontroller.  New EZ Uploader V3.0 for Window and PCB file are included.   __ Designed by Wichit Sirichote

Easy-Downloader V1.1 with SDCC Renovated programmer board with SDCC, complete schematic and layout with MAX232 for rs232 level converter! __ Designed by Wichit Sirichote

Easy-Downloader V2.0 The simple programmer for 40-pin AT89C51/52/55.  Modified firmware for free compiler 8051, sdcc.  Beta version for 89S51 and 89S52, a bit hardware modification.   __ Designed by Wichit Sirichote

Easy-Downloader V2.1 Simple modification of Easy programmer V2.0 enables the 89C55WD to be programmed.  The beta version of EZ55.  HEX and source code EZ55.  C are available for download.   __ Designed by Wichit Sirichote

Easy-Downloader V3.0 New design the flash programmer board specially for 89C55WD.  The lock and erase functions are now implemented and tested.  (not recommended) __ Designed by Wichit Sirichote

Eavesdrop On RS-232C Lines 12/05/96 EDN-Design Ideas When debugging serial links between computers, you need to monitor the data moving in both directions across the serial link.  As long as the data is half-duplex--only one direction "talks" at a time--the circuit in Figure 1can capture data on both the transmit and receive lines of the RS-232C connection and retransmit this data to a third computer.  This third computer can monitor the data using a simple terminal program that allows you to watch the data on a screen and capture the data to a disk file.  The monitoring computer receives but does not transmit information.   __ Circuit Design by Rick Downs, Dallas Semiconductor, Dallas, TX

EchoMp3 v3.1-SDHC Card Audio player with VS1053 The EchoMp3 is a small Audio player.  It's of excellent quality.  And it uses normal SDHC cards up to 16 GB.  Mp3, Wav, Ogg-Vorbis, Wma and Mid formats are supported.  Powered by two AA (HR6) 1V2 batteries.  Runs on a PIC18F46K20 at 64 MhZ.  Up to 320 kBps bitrate VBR and CBR at 44,1 kHz.   ID3 v2.3 tags supported.  Directory and file fragmentation support.  Serial Interface control.  Full user control (volume, track, pause, skip, directory, shuffle) with a micro joystick. __ Designed by Michel Bavin

EEPROM Driver for 24lc64, 128 & 256 AVR Controllers I had been putting off writing a driver for some 24LC64 and 24LC256 EEPROMS I was thinking about using, when I came across a temperature logger application written by Sean Ellis.  The Temperature logger was posted on on www.  avrfreaks.  net on January 10, 2002, project ID 49.  The original application was written for the ATtiny15, which has a small hardware stack, so when extracting the I2C code, I massaged it a little bit to make it more compact when running on processors equipped with a RAM stack while making it a little easier to customize for new applications.   __ Designed by Dick Cappels

EEPROM Interface for Beginners Electronic systems today incorporate a number of peripheral ICs that have to communicate with each other and the outside world.  To maximise hardware efficiency and simplify circuit design, Philips developed a...__ Electronics Projects for You

EEPROM Project Many projects require the use of an external EEPROM to store data.  This project will give you all the details on how to interface the Basic Stamp II with a 64K SPI Bus Serial EEPROM.  Great for those datalogging applications __ Designed by Shaun Wilson

Efficient All-In-One USB Power Management IC Solution DN1008 Design Notes__ Linear Technology/Analog Devices

Efficient Compact 2-Phase Power Supply Delivers 40a to Intel Mobile CPUs DN284 Design Notes__ Linear Technology/Analog Devices

Electric Curtains Control This hybrid circuit uses a mixture of transistors, an IC and a relay and is used to automatically open or close a pair of curtains.  Using switch S3 also allows manual control, allowing for curtains to be left only partially open or closed.  The circuit controls a motor which is attached to a simple pulley mechanism, to move the curtains.  I first started this circuit over 20 __ Designed by Andy Collison

Electrically Isolated RS422 Interface using Sn75176b or Max485 This interface circuit provides electrically isolated RS422 communication interface to the PC serial port the isolation circuit protect the PC from direct connection to hazardous voltages. __ Designed by Wichit Sirichote

Electrically Isolated RS485 Interface using MAX487 or SN75176B This interface circuit provides electrically isolated RS422 communication interface to the PC serial port the isolation circuit protect the PC from direct connection to hazardous voltages. __ Designed by Wichit Sirichote

Electronic Distance Meter Simple device for measuring distance while riding bicycle.  The 16-pin Nitron chip interfaces 16x1 line LCD! __ Designed by Wichit Sirichote

Electronic Lock The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a 4 digit number on a keypad.  The first 4 outputs from the CD4017 decade counter (pins 3, 2, 4, 7) are gated __ Designed by Bill Bowden

Electronic Lock This is a simple but efficient Electronic lock.  This lock can be used to protect any electronic systems from unauthorized usage.  To get access the uses needs to know 8 digit pass-code or password.  When the user enters correct 8 digit password followed by "Enter" button, it activates the relay allowing access to the system controlled by relay.  If the 8 digit pass-code is incorrect, after pressing "Enter" button, the circuits reset's itself without turning the relay on. __ ` Sigmatone

Eliminate PC Echoes 03/30/00 EDN-Design Ideas Long-distance-telephone services available via the Internet often require the PC user to wear headphones of a headset to prevent echo caused by the microphone’s picking up the loudspeaker outputs.  The circuit in Figure 1 eliminates the echo.   PDF contains multiple circuits, please scroll to find this one __ Circuit Design by Hans Krobath, EEC, Nesconset, NY

Embedded Processor Directly Drives LCD 01/09/03 EDN-Design Ideas Driving a bare LCD does not necessarily require specialized interface circuitry or peripherals.  This design idea describes an alternative drive scheme, which you can easily implement using the general-purpose outputs of a microcontroller.  Many embedded-system applications need to interact with a user by displaying simple numeric or alphanumeric characters __ Circuit Design by Daniel Malik, Motorola, Czech Republic

Emissions killers trap common-mode currents 03/02/98 EDN-Design Ideas NOTE : Contains multiple circuits, scroll for this one.  An unshielded twisted-pair cable that is transformer-coupled to a digital system can easily act as a radiating antenna, not because of the differential analog signal the cable carries, but because of common-mode currents induced by unwanted stray coupling from the digital portions of the system.  These currents from fast digital transitions contain harmonics in the hundreds of megahertz and can be a nightmare to design engineers who have to make systems conform to radiated-emissions limits. __ Circuit Design by Glen Chenier, Fujitsu Network Communications, Richardson, TX

Emulate SPI Signals with a Digital-I/O Card 17-Sep-09 EDN-Design Ideas Four I/O lines let you test microcontroller-based products __ Circuit Design by Andy Street, Autoliv Electronics, Lowell, MA

Encoder & PC make complete Motor-control system 12-Dec-02 EDN-Design Ideas This design idea combines a simple ISA-bus-resident interface circuit; a garden-variety PC; a high-resolution optical shaft encoder; and a PWM-controlled, 0.05-hp, brushed, permanent-magnet dc motor to make a high-precision and high-power motion-control system.  The system sequences the precise rotation of an evacuated steel bell jar several feet in diameter, such as those used in molecular-beam __ Circuit Design by Steve Woodward, University of North Carolina, Chapel Hill, NC

Encrypted routines impede hackers, protect licenses 04/04/02 EDN-Design Ideas The use of public-key-encrypted algorithms within licensed applications can prevent hackers from cracking the licensed algorithms.  Moreover, you can use them to disable licensed features that a user doesn't purchase.  Licensing schemes eventually arrive at some critical decision point at which an algorithm decIdeas whether the user is entitled to run that application __ Circuit Design by Lawrence Arendt, Oak Bluff, MB, Canada

Envelope follower combines fast response, low ripple 12/26/02 EDN-Design Ideas Envelope followers extract amplitude information from complex audio waveforms.  The resulting dc voltage often drives nonlinear stages, such as voltage-controlled amplifiers or filters.  You must make a careful trade-off between the speed of response to a rapidly changing input signal and the amount of ripple in the dc output that you can tolerate __ Circuit Design by Harry Bissell, Royal Oak, MI

EPR-000008 1.2 W Universal Input Non-Isolated Tny254 This design kit is a 9 V, 0.33 A, 3 W output and universal input power supply utilizing the TNY264P.  For evaluation, a fully built and tested prototype (EP14) can be found within the Design Accelerator Kit, DAK-14.  

EPR-12 PC Forward Converter with Standby Flyback Power Supply This design kit is a a TOP247 forward converter designed for 145 W PC main applications and a TNY266 flyback for PC standby.  

EPR-16: Linkswitch 2.75 Watt Charger/Adapter This design kit is a 5.5 V, 500 mA charger/adapter.  The charger uses LinkSwitch – an integrated IC combining a 700 V high voltage MOSFET, PWM controller, start-up, thermal shut down and fault protection circuitry.  

EPR-31 Multi Output 180 Watt PC Main Power Supply This design kit is a 9 V, 0.33 A, 3 W output and universal input power supply utilizing the TNY264P.  For evaluation, a fully built and tested prototype (EP14) can be found within the Design Accelerator Kit, DAK-14.  

EPR-33 45 Watt External Adapter Supply This design kit is a 12 V, 45 W power supply, with intended application such as W LCD monitor adapters.  

EPR-34 12 V 30 Watt Universal Input This design kit is a 12 V, 30 W universal input flyback power supply, intended as a standard evaluation platform for TOPSwitch-GX.  

ESD Testing for RS-232 Interfaces DN80 Design Notes__ Linear Technology/Analog Devices

Ethernet 10Base T Simulator Jig yields Zero Emissions 10/22/98 EDN-Design Ideas (File has several circuits, scroll to find this one)  A test jig (Figure 1) is a valuable tool because it evaluates RF emissions from Ethernet unshielded-twisted-pair (UTP) 10BaseT LAN-interface devices without contaminating the measured results with its own RF emissions.  When an RF-emissions-measurement lab tests a multiport, UTP 10BaseT Ethernet device for compliance with FCC-radiated emission limits, the test is meaningful only if the device transmits data packets from all 10BaseT ports.   __ Circuit Design by Glen Chenier, Fujitsu Network Communications, Richardson, TX

Ethernet based Security System The need for Security systems have rapidly grown from being specialized for high-risk areas (like banks, companies , governmental institutions), to be available and demanded rapidly by the average public.  In the last ten years, small businesses have rapidly grown and expanded and the need of reliable, cheap and effective security system is becoming a must ,not only for the business owners ,but also at homes __ Contact: IQ Technologies

Ethernet Controller This circuit is an ETHERNET controller I use the PIC18F452 and the mikroC C Compiler.  I use also the JAVA SCRIPT information you can get from www.w3school.com I Control 8 outputs throw the WEB and transfer time information also. __ Designed by Antonis Pontikakis

Ethernet Interface for Automation Systems Communication with remotely located automation systems is possible via the Internet.  A physical communication port with a network is required for this communication.  An Ethernet interface can be used for that...__ Electronics Projects for You

Ethernet interface for Commodore 64 computer The C64 was the second computer i owned (my first computer was a VIC-20).  I sold my C64 about 1987.  But in 2004 a friend of mine got his hands on a defective SX-64 which i promised to try to repair.  While searching for replacement parts i have been offered a second defective SX-64.  I managed to repair both of them (both suffered from a defective PLA chip and one additionally had a defective VIC chip), so Achim and me now both own a portable C64. __ Designed by Till Harbaum-Impressum

Expand Eight Pin 68hc11 Port to 64 Pins 12/07/95  EDN-Design Ideas The circuit in Figure 1 exploits Strobe B (R/W pin 28) of an M68HC811E2P microcontroller to clock eight 74HC273 latches and thereby expands the output of a single eight-pin port to the equivalent of a 64-pin port.  The circuit uses Port B (pins 9 to 16) , a __ Circuit Design by Paul Kemp, NASA Johnson Space Center Houston, TX

Experimenting the 2051 with C Programming I provide this page for beginners who interested in using C and Assembly for the 2051/4051 chips, e.  g.  , driving dot LED, scanning 7-segment and keypad, connecting dump terminal, stepper motor, SSR, interfacing I2C EEPROM, display driver, calculating CRC-16, etc.   __ Designed by Wichit Sirichote

Experimenting the 8051SBC with C51 Compiler sample code and startup file for 8051SBC.  Using a popular c51 compiler with monitor program.   __ Designed by Wichit Sirichote

Experimenting the AT90S8535 with CodevisionAVR C Compiler Build a simple STK200 compatible ISP cable and a simple 90S8535 circuit.  Do a simple experiment with an Evaluation CodeVisionAVR C Compiler __ Designed by Wichit Sirichote

Exploring the Architectures of Network Analyzers Application Note__ Aligent

Extend the timing capabilities of a PC 10-Jan-02 EDN-Design Ideas Even when you use the internal timing registers and under DOS, a PC cannot easily measure time intervals with better time resolution than a millisecond.  Measuring long intervals with even this precision is a waste of many CPU cycles.  A microcontroller is well-suited for this task; you can easily integrate a PIC with a PC to extend the timing precision into the microsecond range for perio __ Circuit Design by Martin Connors

Extending the Applications of 5V Powered RS-232 Transceivers DN14 Design Notes__ Linear Technology/Analog Devices

Ez Uploader V3.0 Download a window version of EZ and EZ2, the beta EZ3, automatically connects the Easy-Downloder V1.1 or V2.0 to an available COM1-4 port.   __ Designed by Wichit Sirichote

Ez Uploader V3.1 Upgraded EZ3.0 with additional READ command and SAVE AS Intel-HEX file.   __ Designed by Wichit Sirichote

EZ5vb.Zip Modification of Easy-Downloader for running under Linux.  The work has contributed by Amish Vishwakarma, embedded designer from India.  Amish detailed how to implement it by his message 1, 2.   __ Designed by Wichit Sirichote

Ezpic Programmer for PICs & Eeproms ezPIC is low cost serial port programmer for PIC microcontroller and I2C EEPROM.   __ Designed by Wichit Sirichote

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Computer Interface:  #'s         A -  B        C -  E
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