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125 results found, displaying items 41 - 60
VC++ Program Converts Hex Strings To Integers
Binary numbers are seldom implemented in Visual C++ applications because C++ is considered a "high-level" language. Yet in communications systems, where information is transferred between two different devices through a network, using binary or...
One-Pin Keypad Interface Conserves Battery Power
This idea builds on a previous IFD, "Connect Any Keypad With Any Microcontroller Using Only One Pin" (electronic design, May 1, 1998, p. 126), where a 555 timer connects a keypad switch matrix to a microprocessor. The timer converts a...
VCO Transforms Sound Card Into Precision DC-Coupled ADC
Personal-computer sound cards are sometimes used for analog audio signal acquisition. Also, the Web features many free programs that implement virtual two-channel oscilloscopes by acquiring signals through the sound card. However, sound cards suffer...
Low Voltage Powers Parallel-Port Interface
For portable-sensing and data- acquisition applications, a laptop computer and its parallel port (LPT) make good bedfellows. Yet in the effort to extend battery life, many microprocessors and entire systems operate with logic levels down to 1.8 V. The...
Low-Cost Digital Thermometer Uses Single-Chip Microcontroller
In many applications, the ability to read and display temperature is either desirable or an absolute requirement. Some of these applications include temperature probes, thermostats, CPU monitors, and process-control equipment. The ...
Multiple Serial Devices Interface To The I2C Bus
The circuit shown can be used to interface multiple serial devices to the I2C bus, even if they lack the extended-addressing capability required. Information transfer be-tween I2C devices connected to the I2C...
C++ Platform Program Offers Versatile Waveform Spectral Analysis Tool
This idea presents a C++ program that uses the complex class, which enables complex arithmetic. The Discrete Fourier Transform (DFT) is applied to the waveform stored in a disk file—a real sequence of double-precision floating-point binary...
Switch-Debouncer IC Creates A Long-Period Timer
One major application for long-period timers is in remote weather-data stations. These stations measure environmental conditions at regular time intervals and transmit the results to a central collecting facility. Since these small weather stations...
ODBMS Provides Persistent Objects For Embedded Java
Persistent Java objects simplify the storage and exchange of complex object structures. Poet Software's FastObjects j2 is a pure Java implementation of an object database management system (ODBMS). It supports RAM-based, disk-based, and remote...
Low-Cost, 24-V Industrial Controller Is ESD-Protected
To validate a new process before its full-scale deployment, developers first test it in a small-scale pilot plant. Although controlling this plant with programmable logic controllers (PLCs) would allow maximum flexibility, PLCs are too large and...
Program Converts Real Sequences To Cosine Series
This program converts a sampled real sequence stored in a disk file to a harmonically related set of cosine waveforms To view the program, click Download the Code at the top of the page.. The cosine series can be used for waveform...
PLD Code Implements Arbitrary CRC Functions
This idea presents PLD code that can be used to generate arbitrary polynomial cyclic-redundancy-check (CRC) functions. Communication systems often use CRCs to detect transmission errors. CRC functions are typically implemented as shift...
Design Method Allows Tradeoffs In Anti-Aliasing Filter Design
This idea details a design method for making anti-aliasing prefilter parameter tradeoffs between several factors. These factors include the filter pass-band magnitude accuracy, the filter order (the number of poles), the ratio of sample frequency to...
Low-Cost Microcontroller Acts As A Microphone Simulator
If you have ever been involved in testing microphones while setting up a PA system, you have probably heard the phrase, “Testing, one, two, three” countless times. This idea describes a small, self-contained unit able to simulate spoken voice. It...
Compact Algorithm Filters 16 Digital I/O Signals In Emebbed Systems
This idea presents a piece of firmware that has proven to be both compact and extremely useful in several field applications involving embedded controllers. The concept originated when one of our embedded-system customers had problems in...
Optical-Fiber Link Switches Multiple RS-232 Ports
A recent application required a switch that would allow multiple RS-232 serial data links to share a single physical link. This switch was necessary to reduce the cabling between the instruments on the focal plane of our upcoming 2-m optical...
Use A PIC12C508 To Emulate An MM53200 Coder/Decoder
Depending on the logic state of a single configuration pin, the popular MM53200 can be used either as a remote-control coder or decoder. The coding function, however, is much simpler than the decoding one. Therefore, it lends itself quite well to...
Cascaded Common-Gate FET IC Provides Flexible Level Translation
Today’s complex systems often feature a multitude of devices incorporating several different logic power families. In order for these mixed-mode systems to operate properly, some type of voltage translation and voltage clamping is needed. This...
Add Real-Time Control To QuickBasic
Even though Windows-based applications are now the market standard, DOS-based industrial applications or prototypes still find a place in the field of real-time control. For these applications, a simple and deterministic OS (DOS) might be the only...
Program Quickly Calculates Transformer Design Parameters
During the transformer design process, design engineers need to quickly verify that their designs satisfy the various interrelated transformer design requirements. These would include the size of the core, the required turns ratio in the primary and...
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