Circuit Cellar Ink 247
February 2011

Table of Contents

4 CJ Abate	HTML Task Manager Connectivity, Power, and Apps
8 John Gorsky	HTML New Product News ConnectPort LTS multifunction, wireless, programmable terminal server from Digi International ILLUMRA solar-powered, wireless door/window sensor from ILLUMRA Spinneret Web Server based on Propeller from Parallax, Inc. SeaI/O-530 and SeaI/O-540 digital I/O modules from Sealevel Systems, Inc. QuickUSB QUSB2 high-speed USB 2.0 module from Bitwise Systems MCP794xx stand-alone I2C Real-Time Clock/Calendar (RTCC) family from Microchip Technology, Inc. RF5632 power amplifier IC optimized for WiMAX systems from RF Micro Devices, Inc. DK Series of nonisolated, point-of-load (POL) DC-to-DC converters from FDK America, Inc. RL78 family of extremely low-power microcontrollers from Renesas Electronics America, Inc. WEBENCH FPGA Power Architect design tool to model and optimize power supplies for FPGAs from National Semiconductor Corp. STM32 Discovery Kit lo-cost hardware development platform from STMicroelectronics MSP430L092 ultra-low-power true 0.9-V MCU from Texas Instruments LynxSecure 4.0 virtualization software from LynuxWorks, Inc. LT1999 high-voltage amplifier designed for bidirectional current sensing from Linear Technology Corp.
15 David Tweed	HTML Test Your EQ - Answers for Issue 246
The Consummate Engineer 16 George Novacek	RF Design Review Wireless technology is all the rage. But it took decades of research and development to usher in this "wireless era." As you'll see, the uses of wireless technology might have changed, but many of the fundamental technologies and theories remain the same.
18 Antonios Chorevas	Parallel Processing Computer A Design for Solving Computation-Intensive Problems This parallel processing computer uses multiple microcontrollers for problem-solving applications. The PIC-based design can be used for the development and fine-tuning of parallel algorithms. Download: Chorevas-247.zip
28 Carlo Tauraso	Wireless Access and Control A "MiWi" Network Card Reader Need an inexpensive wireless access control system? This article presents the MiWi protocol and details how to design a network card reader. Download: Tauraso-247.zip
36 David Penrose	Remote Humidity Control System This innovative humidity control system calculates water vapor pressure from temperature and humidity readings. When it detects that the outside air is drier than the air indoors, it triggers a ventilation system. You can monitor and control the system via an Internet-connected PC. Download: Penrose-247.zip
The Darker Side 44 Robert Lacoste	Don't Fade Away! A Multipath Fading Experiment Multipath fading is a nasty phenomenon that can ruin a short-range radio application. This article explains the topic and details some techniques you can use to protect your RF systems.
Above the Ground Plane 52 Ed Nisley	Parallel NiMH Cell Measurement Got batteries? You need to test them. Here you learn how to build an eight-channel parallel cell tester, with an Arduino Mega microcontroller board providing PWM DAC outputs to control the discharge currents, ADC inputs to measure the cell voltages under load, and serial output over a USB connection for data logging. Download: Nisley-247.zip
From the Bench 60 Jeff Bachiochi	Serving Up BASIC Hardware developers need to understand software, and software developers need to understand hardware. Here you learn about an effective solution for "serving up" BASIC programs. Download: Bachiochi-247.zip
Silicon Update 66 Tom Cantrell	Tune In, Turn On Power Via Radio Waves The idea of wireless power delivery isn't new. At the dawn of the last century, electronics pioneer Nikola Tesla had Wardenclyffe, which was his vision of pervasive power. Today, Powercast is bringing their own IC-age version of Tesla's vision to life, delivering power via radio waves. Tune in and turn on!
74	Crossword Puzzle
78	Crossword Puzzle - Answers for Issue 246
79	Advertiser's Index / March Preview
80 Steve Ciarcia	HTML Priority Interrupt Patently Insane

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