Circuit Cellar Februari 2010

Click Here to download circuit cellar February 2010

Circuit Cellar Januari 2010

Click Here To Download Circuit Cellar Januari 2010

Serial Device Tester

The Serial Device Test Utility is designed to assist in analyzing the communicationbetween a PC and a device connected over the serial port. The application has a number of features to make this process relatively easy. Some of the features that are included are a fully configurable COM port interface, the ability to program constant wrappers (header/footer) around the serial port data, the ability to send data using either ASCII text, decimal values for each byt, or hexadecimal values for each byte, inbound data is decoded into both standard ASCII text and hexadecimal byte values, and the ability to log the data to a file in either HTML or plain text format.


The ASCII window for the inbound data has modified the data slightly -- when there is a carriage return or line feed in the data string, those values have been replaced with a "." in order to keep the ASCII window in sync with the Hex window. This utility has been very useful in debugging communications between remote devices and the computer when for whatever reason the actual data being sent does not agree with the documentation or the documentationis unclear on the exact byte sequence being sent or received. One of the most common areas of confusion that this will clear up immediately is what the end of a line truly is -- whether or not it is a carraige return, a line feed, or both (and if both what order they are actually sent).

Features that are currently under development for the next couple of releases include: The ability to pre-program a variety of commonly used commands that will be sent upoun selection, the ability to code automatic responses which wil be useful in situations where Acks or an equivalent response are required, inclusion of CRC and checksum capabilities, file transfer capabilites, and others still to be determined.

Click here to download Serial Device Tester

The LabVIEW Style Book (National Instruments Virtual Instrumentation Series)

Drawing on the experiences of a world-class LabVIEW development organization, The LabVIEW Style Book is the definitive guide to best practices in LabVIEW development.

Leading LabVIEW development manager Peter A. Blume presents practical guidelines or "rules" for optimizing every facet of your applications: ease of use, efficiency, readability, simplicity, performance, maintainability, and robustness. Blume explains each style rule thoroughly, presenting realistic examples and illustrations. He even presents "nonconforming" examples that show what not to do-and why not.


Coverage includes

* Significance of style: How good style improves quality and actually saves time over the full project life cycle
* Before you code: Configuring your LabVIEW environment, and organizing your files on disk and in the LabVIEW project
* LabVIEW project specifications: A specialized standard for specifying LabVIEW application requirements
* Efficient VI layout and development: front panel, block diagram, icons, and connectors
* Data structures: Choosing data types, efficient use of arrays and clusters, and special considerations with nested data structures
* Error handling strategies: Trapping and reporting errors for robust and reliable applications
* Design patterns: Standard VI architectures and application frameworks that promote good style
* Documentation: Essential rules for source code documentation and streamlining the process
* Code reviews: Enforcing a style convention using a checklist, the LabVIEW VI Analyzer Toolkit, and peer reviews
* Appendixes: Convenient glossary and style rules summary

This book will be indispensable to anyone who wants to develop or maintain quality LabVIEW applications: developers, managers, and end users alike. Additionally, it will also be valuable to those preparing for NI's Certified LabVIEW Developer or Certified LabVIEW Architect exams, which contain significant content on development style.

Foreword by Darren Nattinger
Preface
Acknowledgments
About the Author
Chapter 1 The Significance of Style
Chapter 2 Prepare for Good Style
Chapter 3 Front Panel Style
Chapter 4 Block Diagram
Chapter 5 Icon and Connector
Chapter 6 Data Structures
Chapter 7 Error Handling
Chapter 8 Design Patterns
Chapter 9 Documentation
Chapter 10 Code Reviews
Appendix A Glossary
Appendix B Style Rules Summary
Index

About the Author

Peter Blume is the founder and president of Bloomy Controls, Inc., a National Instruments Select Integration Partner that specializes in LabVIEW-based systems development. Since LabVIEW Version 2.5, Blume and his staff of engineers have solved more than a thousand industrial applications for customers throughout the northeastern United States. To promote consistent quality among multiple developers in multiple offices, Blume established and evolved the company's LabVIEW development practices.

Blume has written and presented multiple LabVIEW style-related presentations, including Bloomy Controls' Professional LabVIEW Development Guidelines at NIWeek 2002 and Five Techniques for Better LabVIEW Code at NIWeek 2003. He also has published technical articles in various trade publications, including Test & Measurement World, Evaluation Engineering, Electronic Design, and Desktop Engineering.

Blume holds a Bachelor of Science degree in electrical engineering from the University of Connecticut. He is a National Instruments Certified LabVIEW Developer and Certified Professional Instructor. The company has offices in Connecticut, Massachusetts, and New Jersey. For more information, visit www.bloomy.com.

Readers who want to contact Blume regarding style-related suggestions, questions, or comments may do so at the following email address: lvstyle@bloomy.com . Readers interested in contracting Bloomy Controls for a LabVIEW development project should call us directly or contact us through our website at www.bloomy.com/quote.

Click here to download this ebook

Password : www.freebookspot.com

AVR Blips

Thanks to: stevech@san.rr.com childressS@gmail.com

BLIPS is a graphical user interface and command line MS Windows program that loads programs and data into an Atmel AVR microprocessor’s flash and EEPROM memories. BLIPS transfers this data from a PC via either a serial port or a LAN/WAN connection (IP) to an Ethernet/WiFi to serial bridge – such as the Lantronix Xport or WiPort, or equivalent device. The AVR-side bootloader can be the sample provided in source code form with BLIPS or any that meets the Atmel AVR- 109 protocol.

Version 3 of BLIPS adds an optional command line interface to the graphical user interface in prior versions. This permits BLIPS to be called from scripts and batch files, with file and action parameters, and return a success status. The batch mode support for commercial for-profit endusers is controlled by a usage key. A sample command line batch file is:

blips progf -d atmega8 -p com1 -b 57600 "Flash file1.hex"
echo blips exit status = %errorlevel%

Click here to download more about AVR Blips

Notepad ++

Notepad++ is a free (as in "free speech" and also as in "free beer") source code editor and Notepad replacement that supports several languages. Running in the MS Windows environment, its use is governed by GPL License.

Based on a powerful editing component Scintilla, Notepad++ is written in C++ and uses pure Win32 API and STL which ensures a higher execution speed and smaller program size. By optimizing as many routines as possible without losing user friendliness, Notepad++ is trying to reduce the world carbon dioxide emissions. When using less CPU power, the PC can throttle down and reduce power consumption, resulting in a greener environment.


More about Notepad ++ click here

Frequency to Voltage Converter Circuit

This circuit good working in the frequency range 0-850 Hz. You can change the value of R8 and C1 in order to get the various frequency range.

PIC18F4550 Module Trainer Board

This site presents a simple didactical microcontroller modules designed for teaching of microcontroller systems, digital signal processing, and system programming.

Full documentation (schematic diagram and pcb design) is provided, and you are free to duplicate the modules. However, if you are going to use THESE schematic or PCB files to build and distribute the modules, than you should include the information about the original source and about the availability of the documentation.



PIC18F4550 module Parameters:

1. Clock frequency up to 48MHz (12 MIPS) with oscilator working at 8 MHz
2. Memory: 2KB RAM, 256 B EEPROM, 32KB code (FLASH)
3. USB 2.0 Interface - Low Speed & Full Speed
4. 10-bit ADC (7 channels available for user)
5. 2 analogue comparators
6. 4 timers and 2 PWM/CCP modules (one extended)
7. Synchronous/asynchronous serial interface (EUSART)
8. Synchronous serial interface: SPI/I2C
9. Parallel SPP port - for direct transfer of data over USB





This module is based on the PIC18F4550 microcontroller. It offers the direct USB connectivity. Available documentation includes the schematic diagram as PDF, sources of the schematic diagram in the gschem format, and the PCB layout in the free PCB program format.

ALL Material Download

Source : http://www.ise.pw.edu.pl

The NanoVM - Java for the AVR

The NanoVM is a java virtual machine for the Atmel AVR ATmega8 CPU, the member of the AVR CPU family used e.g. in the DLR Asuro robot, manufactured by AREXX engineering. With the NanoVM, the Asuro can be programmed in the popular Java language using the standard Sun JDK. The NanoVM and its tools are distributed under the GPL and can be used on other AVR based systems as well.

The NanoVM for Asuro replaces the original firmware of the Asuro with a Java virtual machine capable of running a subset of the virtual machine command set. This enables e.g. the Asuro to interpret java bytecode and to run simple java programs like e.g. this one.


The NanoVM is a very resource aware implementation of the java vm. The Asuro version including a boot loader and several native classes fit into the 8kBytes flash rom of the Asuros AVR ATmega8 CPU. The complete 512 Byte EEPROM space of the CPU are available as Java program space and 75% of the 1 kByte RAM space are available to the running Java program.

More information about The NanoVM - Java for the AVR click here

Displaying SubVIs as Expandable Nodes [LabVIEW Tutorial]

SubVIs may be viewed as either icons or expandable nodes. Express VIs are viewed as expandable nodes, by default. To view a subVI as an expandable node, right-click on it and uncheck the View As Icon option by selecting it from the pop-up menu, as shown in Figure 71. This will cause the subVI's appearance to change, such that its icon is surrounded by a yellow background, as shown in Figure 72.

Figure 71. SubVI with View As Icon setting enabled, as also indicated in its visible pop-up menu

Figure 72. SubVI with View As Icon setting disabled, appearing as an expandable node

We can resize the subVI vertically, which causes inputs and outputs to appear below the subVI's icon, as shown in Figure 73. Note that inputs and outputs made available are no longer available to the left and right of the subVI's icon.

Figure 73. Resizing (expanding) a subVI configured as an expandable node

You can also show and hide inputs and outputs from the subVI's pop-up menu, using the Select Input/Output submenu to change an input/output, Insert Input/Output to insert a new input/output, and Remove Input/Output to remove an input/output (see Figure 74).

Figure 74. Selecting the visible inputs and outputs of a subVI configured as an expandable, from its pop-up menu