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Software Center for Design Ideas (1995-June 7, 2001)- EDN-Design Ideas-December 11, 2002 This section contains code listings and computer-readable material associated with Design Ideas published from 1995 through June 7, 2001. To find the file you need, use your browser's 'Find' function to search for 'DI####' where '####' is the reference number of the Design Ideas article in question (you can find the reference number in parentheses at the end of the article). For listings and software associated with Design Ideas published after June 7, 2001, you can find them directly in the Web versions of the Design Ideas in which they ran. Design by EDN Staff
Software configures IBM PC interrupt- 11/10/94 EDN Design Ideas: Anyone who has installed an expansion card in an IBM PC-AT expansion slot has dealt with interrupt conflicts. Often, despite the manufacturer's claims of "plug-and-play" compatibility, inserting a simple I/O card turns a fully functional computer into a brain-dead piece of equipment. Interrupt assignments and the possible resulting conflicts usually cause this pernicious problem. Design by Said Jackson, Consultant, Hamburg, Germany
Software Implements Digital Potentiometer- 06/08/95 EDN Design Ideas: In some applications (for example, dynamic biasing of laser diodes) , the use of digital potentiometers, or trimDACs, has limitations because of resolution, accuracy, or interface difficulties. Using the simple (but maybe not so obv Design by Gray Creager, Xicor Inc, Milpitas, CA
Software makes full use of 8051's interrupt system- 12/06/01 EDN Design Ideas: The program in Listing 1 uses a pseudo-RETI instruction to provide a five-priority-level interrupt system for the 8051P microcontroller. The interrupt-priority order, from high to low, is INT0 IT0 INT1 IT1 INTP. Before the pseudo-RETI instruction arrives in the IT0 or IT1 interrupt-service routine, the address of the first instruction, which is after the pseudo-RETI instruction, goes ba Design by Deng Yong, Shanghai Jiaotong University, China
Software PLL locks VCXO to reference- 08/01/98 EDN Design Ideas: ( FILE has several circuit ideas. Scroll to find this one.) The circuit in Figure 1 provide as a precisely controlled clock signal. The method modifies the controller's quartz oscillator such that the control voltage at point P1 controls the frequency. A D/A converter using an R-2R ladder network connected to output port D generates the control voltage. A precise reference-frequency signal connects to the controller's analog-comparator input, AIN0. In this application, the reference frequency is 162 kHz (derived from a long-wave broadcast station). You can use any other 10- to 200-kHz frequency. Design by Martin Ossmann, Philips Research Labs, Aachen, Germany
Software reset uses I²C I/O port- 05/16/02 EDN Design Ideas: You can use the circuit in Figure 1 to allow the I2C or SMBus to control device resets in a system by using the PCA9554 I2 C I/O-port IC. Normally, a reset function takes an active-low signal. On power-up of the PCA9554, the IC set Design by Bob Marshall, Philips Semiconductors, Sunnyvale, CA
Software routine minimizes large logic table- 07/03/97 EDN Design Ideas: You can define combinatorial logic circuitry by explicitly stating the output patterns that result from particular input patterns. Such behavioral description is sometimes more convenient than writing logic equations; virtually all logic-design systems accept table entry, among other entry formats. Unfortunately, limitations of allowable table size preclude direct minimization of large logic tables. The technique proposed here uses Espresso, a public-domain logic minimizer available from the University of California--Berkeley. Design by Jerzy Chrzaszcz, Warsaw University of Technology, Warsaw, Poland
Software routine stabilizes hardware register - 07/18/96 EDN Design Ideas: Microprocessor peripheral devices with multibyte registers often harbor a subtle bug that can bite the unwary software engineer. If your program reads the peripheral device's registers at the same time that the device is updating those registers, the program can obtain a mixed result. One or more of the bytes could be left over from a previous reading, Design by Greg Young, Z-World Engineering, Davis, CA
Software speeds 8051 RS-232C receiver- 12/04/97 EDN Design Ideas: This method allows for receiving data from a half-duplex, 9600-bps or faster serial link in an 8051-based system without using a hardware UART. The method's goal is to minimize performance degradation that software-service routines incur. Bit-cell time for 9600-bps transmission Design by Jerzy Chrzaszcz, Warsaw University of Technology, Poland
Solving a customer’s problem leads to a winning ide- EDN Design Ideas: 05/12/1994 To say Ken Chapman is thrilled to be the 1993 Design Ideas winner for his design "Fast integer multipliers fit in FPGAs" is an understatement. After the shock of learning he won, Chapman’s reaction was one of wonder and pride that so many people had reacted favorably to his idea. "It’s wonderful to come up with an application that people want to use," he says. The award is a nice bonus as far as Chapman is concerned, but the real excitement comes from learning that people around the world are using his design. Design by Susan Rose, Contributing Editor, EDN
System's real-time clock "hides" a code sequence- 10/27/05 EDN Design Ideas: Keep key code sections protected from prying users Design by Mihaela Costin, Delmhorst Instruments, Towaco, NJ
Three-phase Programmable Controller for ON/OFF Motor- Automatic on/off controller for a 3-phase electric motor can be made with a programmable time switch. In this case a maximum of eight time durations can be programmed. The system has two...__ Electronics Projects for You
Tony Nixon’s Pocket Programmer (PIC)- Tony Nixon’s Pocket Programmer. The Pocket Programmer is a standalone serial programmer that can program most of the PICmicro®MCU range of microprocessors. (12C6xx, 16Cxxx, 16Fxxx, 18Cxxx) It works from a single 18VDC supply or with 2 X 9 volt batteries. Combine this with 64K of on board EEPROM which can store up to 32 HEX files and you have a truly portable programmer / patcher __ Designed by Seiichi Inoue
Transaction Approach to Error Handling- EDN Design Ideas: 04/28/94 You can apply the transaction-based recovery concept used in databases to any application. Doing so helps provide more reusable and maintainable programs. Programs contain two major paths: a forward path that does the work and a reverse path that rolls back the work when the program detects errors. Typically, these paths are so tightly bound together that both paths are difficult to read. Code that is difficult to read results in code that is difficult to write, debug, enhance, and reuse. Design by Bruce A Rafnel, Hewlett-Packard Co
Ultra-Low-Cost Programmer for AT90s Family- With this programmer you can program AT90S1200, 2313, 2323, 2343, 4414, 4434, 8515, 8535 __ Designed by © Vassilis Serasidis
Universal OS PIC Programmer- This programmer requires only a basic terminal program capable of uploading an asci PIC HEX file. It does not matter what operating system or computer (MAC, Win98, XP, Vista, DOS, Linux, etc.) is used to talk to it. __ Designed by Luhan Monat - Mesa Arizona
USB to RS232 Dongle- With serial and parallel ports being phased out on new computers, hardware designers and hobbyists have no choice but to convert the USB port back to RS232 serial. FTDI have a very nice chip that does just that, the FT232AM. This chip converts USB to a standard high-speed serial port. The bonus with FTDI is the drivers are already written for you. All you have to do is design the hardware and download the serial USB drivers from FTDI's web site. __
Use a system's real-time clock to "hide" a code sequence- 10/27/05 EDN Design Ideas: Keep key code sections protected from prying users Design by Mihaela Costin, Delmhorst Instruments, Towaco, NJ
Victoria TAFE programmer (based on AT89C2051)- Schematic Only __ Designed by Peter Averill
Virtual-Zener Simplifies High-Voltage Interface- 03/20/03 EDN Design Ideas: Buck regulator and two inductors make dual-polarity converter - This design for a photonic switch needs than approximately 70V at the cathode of a duo-lateral optical position-sensing device. This voltage gets speedy response at lo Design by Philip Lane, Transparent Networks Inc, Bellevue, WA
Visual Basic Models MDAC offset- 03/13/98 EDN Ideas - ( FILE has several circuits, scroll to this one) It's hard to imagine that, for such an old-hat item as a standard R-2R multiplying DAC (MDAC], there still exists some "dark area" in modeling and calculating its dc offset, VOFF, and related output resistance, RO. You can obtain some information from References 1and 2 and other references regarding the code dependency of RO and VO, but the simplified formulas Page includes several designs. Scroll to find this one Design by Olga Belousava, Los Alamos, NM, and Alex Belousov, New York, NY
Visual Basic Program Helps Convert OrCAD Schematic to PC-Board Layout- 03/16/95 EDN Design Ideas: The easy-to-use Visual Basic program and documentation in the ZIPfile attached to EDN BBS /DI_SIG #1653 converts an OrCAD bill of materials derived from an OrCAD schematic into a "stuff" file for OrCAD's PCB pc-board-layout program. (See also /DI_SIG #124 Design by Paul Kemp, NASA Johnson Space Center Houston, TX
Voltage reference is software-programmable- 08/18/05 EDN Design Ideas: Obtain extra reference voltages from existing ones Design by Reza Moghimi, Analog Devices, San Jose, CA
Wisp628 ISP Microchip PIC Programmer- The XWisp program can be used to control the Wisp628 hardware. This program can be used on Windows (95 or higher) , either from a DOS box command line or using the windows interface. It is available as Python source. It requires that a suitable Python (2.1 or higher) and the Python for windows extensions are installed. The XWisp program supports the full range of target chips supported by Wisp628. __ Designed by © © 2002 Van Ooijen Technische Informatica / Wouter van Ooijen
XMON- PC windows program download, Micro controller development debugging realtime curve variable __ Designed by Thomas Scherrer OZ2CPU
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