2CJ Abate | HTML Task ManagerContinuity of Content |
10CJ Abate | HTML New Product News
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15David Tweed | HTML Test Your EQ - Answers for Issue 266 |
16Stuart Oliver | Math Routines Using dsPIC FeaturesSmall embedded systems frequently require real-number math routines. Good performance and accuracy can be achieved at a low cost using small math routines and the dsPIC hardware features. This article describes some routines that use the accumulators and barrel shifter.Download: 267-Oliver.zip |
20Richard Lord | Digital Camera ControllerPart 1: Hardware & ConstructionThe Photo-Pal is a microcontroller-based electronic flash-trigger camera controller that features four modes of operation: triggered shutter, triggered flash, multiple flash, and time lapse. Now you too can take sound-triggered photos.Download: 267-Lord.zip |
30Kerry Imming | FAT CacheUsing File Allocation Table (FAT) Cache for Fast and Efficient SD Card AccessThe FAT file system provides a convenient standard for data storage on SD flash memory cards. But that convenience comes with a performance penalty, since file system information must be accessed in addition to the file data. This article describes an algorithm that maximizes file data bandwidth by prefetching and compressing the file system information, virtually eliminating the file system overhead.Download: 267-Imming.zip |
The Consummate Engineer34George Novacek | Managing Project RiskRisk is an integral, unavoidable part of project development. This article describes the process of defining and evaluating risk factors that could negatively impact project cost and delivery. |
Embedded in Thin Slices38Bob Japenga | Concurrency in Embedded SystemsPart 3: Avoiding Concurrency ProblemsThe first two parts of this article series introduced concurrency in embedded systems and discussed two common concurrency design problems. The third part of this series examines generic ways to avoid some of these problems. |
Above the Ground Plane42Ed Nisley | MOSFET TesterPeltier Temperature Control and ResultsBecause semiconductor properties vary with temperature, a MOSFET tester must control the transistor's temperature. Ed's Arduino-based tester maintains a constant temperature using a linearized thermistor and a Peltier thermoelectric module. This column describes the temperature controller and presents some MOSFET characteristics over a 0C to 50C range.Download: 267-Nisley.zip |
The Darker Side58Robert Lacoste | Introduction to IIR FiltersInfinite impulse response (IIR) filters are feedback systems that use their outputs as inputs. It's easy to design a simple IIR filter and program it in your application if you know what tools to use. This article uses some simple math to provide the basics on IIR filters and explains the difference and similarities between IIR filters, finite impulse response (FIR) filters, and analog filters.Download: 267-Lacoste.zip |
From the Bench68Jeff Bachiochi | Mechanical Gyroscope ReplacementPart 1: A Microelectromechanical Systems (MEMS) SolutionA gyro uses internal circuitry to drive its masses into resonance, sample capacitive-coupled displacement sensors, and filter out unwanted artifacts. This article describes how a MEMS solution provides stability to a mechanical gyro. One sensor helps make up for the other's weaknesses when using a gyro, an accelerometer, and a magnetometer together. |
76 | Crossword Puzzle |
79 | Crossword Puzzle - Answers for Issue 266 |
80Steve Ciarcia | HTML Priority InterruptGo Team! |
FTP Directory for INK 267 | |
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