Circuit Cellar Ink 250
May 2011

Table of Contents

4 CJ Abate	HTML Task Manager Issue 250 and Beyond
8 John Gorsky	HTML New Product News STC12C5A60S2 single-chip 80C51-based microcontroller from STC Microcontroller, Ltd. SeaI/O-570 analog and digital I/O modules from Sealevel Systems, Inc. UWPH-2-NEMA wireless pH/temperature transmitter from Omega Engineering, Inc. LTC6803 high-voltage battery monitor IC from Linear Technology Corp. Windmill 7 data acquisition and control software suite for Windows 7 from Windmill Software Ltd. W-Family of F-RAM memory with serial I2C, SPI, and parallel interfaces from Ramtron International Corp. ZSSC3122 cLite capacitive sensor signal conditioner from Zentrum Mikroelektronik Dresden AG (ZMDI) MAX11855 and MAX11871 TacTouch line of touch-screen controller ICs from Maxim Integrated Products AD8229 1.0-nV/root-Hz high-temperature, low-noise instrumentation amplifier from Analog Devices, Inc. D6000 series of seven-channel analog input smart data acquisition Modbus modules from DGH Corp.
13 David Tweed	HTML Test Your EQ
The Consummate Engineer 14 George Novacek	Functional Upset Functional upset occurs when an embedded controller stops working as designed. To minimize the impact of such a problem, you should follow professional wiring practices and create system topologies in a thoughtful, systematic fashion.
16 Richard Pierce	Stereo Spectrum Analyzer There are plenty of spectrum analyzers on the market. But you'll likely need two of them to see both channels of a stereo signal. One solution is to build an analyzer to suit your needs. This design features two integrated channels of display, each with a 16 x 16 LED bar graph. Download: Pierce-250.zip
26 Keith Brown	Control Shaft Encoders Searching for an ideal control shaft encoder can be a time-consuming task. This article details some workarounds to help determine which encoder is appropriate for an application. An interesting debounce and decode circuit is also presented. Download: Brown-250.zip
36 Mariano Lizarraga Renwick Curry Gabriel Elkaim	Reprogrammable UAV Autopilot System Part 2: Testing and Results In the first part of this series, you were introduced to the SLUGS reprogrammable UAV autopilot system. This article details the system's software and flight test results. Download: Lizarraga-250.zip
46 Thomas Mitchell	Getting Started with Microprogramming Part 2: A Look at the Meta-Assembler The first article in this series detailed the architecture, programmer model, instruction set, and general operation of a simple microprogrammed processor. Here you learn about real-world microprogramming and the meta-assembler. Download: Mitchell-250.zip
56 Jaime Garnica	Testing Platform Construct a Custom Scope The Scopey II is a handy oscilloscope and spectrum analyzer. In Oscilloscope mode, it acts as a basic oscilloscope with a sampling rate up to 750 ksps. In Spectrum Analyzer mode, a 256-point FFT is performed to obtain the spectrum of an input signal. Download: Garnica-250.zip
Lessons from the Trenches 64 George Martin	Design Development Planning and Tools You can read and write C code. The next step is to start building something. Follow these tips as you prepare to develop your next product.
From the Bench 68 Jeff Bachiochi	Error Checking Data security isn't a perk. It's a requirement. This article covers the topics of error checking, checksums, and the cyclic redundancy check. Error checking matters. Download: Bachiochi-250.zip
74	Crossword Puzzle
78	Crossword Puzzle - Answers for Issue 249
79	Advertiser's Index / June Preview
80 Steve Ciarcia	HTML Priority Interrupt Happy 250th

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