Free Raspberry Pi Poster

The Raspberry Pi is a computer with no casing, no keyboard, no hard disk and no screen. Despite all that, it’s taking the world by storm!

Get your free Raspberry Pi poster now, courtesy of Elektor, RS Components, and CC! Go ahead: download, print, and then enjoy!

Free Raspberry Pi Poster

RASPBERRY PI ESSENTIALS

Model A has 256-MB RAM, one USB port, and no Ethernet port (network connection). Model B has 512-MB RAM, two USB ports, and an Ethernet port.

The Raspberry Pi Model B, revision 2 board:

  • Status led labels: top led has label “ACT” and bottom led has label “100”
  • Header P2 is not populated
  • The text underneath the Raspberry Pi logo reads: “(C) 2011,12”
  • The area next to the micro usb port has CE and FCC logos and the text “Made in China or UK” along the board edge.
  • There are two 2.9-mm holes in the PCB, which can be used as mounting holes.
  • P5 is a new GPIO header with four additional GPIO pins and four power pins. Also note that some pin and I2C port numbers of connector P1 have been modified between revisions!
  • Header P6 (left from the HDMI port) was added, short these two pins to reset the computer or wake it up when powered down with the “sudo halt” command.

The Raspberry Pi measures 85.60 mm × 56 mm × 21 mm, with a little overlap for the SD card and connectors which project over the edges. It weighs 45 g.

The SoC is a Broadcom BCM2835. This contains an ARM ARM1176JZFS, with floating point, running at 700 MHz, and a Videocore 4 GPU. The GPU is capable of BluRay quality playback, using H.264 at 40 Mbps. It has a fast 3D core which can be accessed using the supplied OpenGL ES2.0 and OpenVG libraries.

The Raspberry Pi is capable of using hardware acceleration for MPEG-2 and VC-1 playback, but you’ll need to buy license keys at the Raspberry Pi Store to unlock this functionality.

Which programming languages can you use? Python, C/C++, Perl, Java, PHP/MySQL, Scratch, and many more that can run under Linux.

TROUBLESHOOTING TIPS

If you’re getting a flashing red PWR LED or random restarts during the booting process, it’s likely that your PSU or USB cable has problems. The Raspberry Pi is pretty picky and requires a solid 5-V/1000-mA power supply. For other issues and more troubleshooting tips check out the extensive overview at the eLinux website

Circuitcellar.com is an Elektor International Media website.

CC269: Break Through Designer’s Block

Are you experiencing designer’s block? Having a hard time starting a new project? You aren’t alone. After more than 11 months of designing and programming (which invariably involved numerous successes and failures), many engineers are simply spent. But don’t worry. Just like every other year, new projects are just around the corner. Sooner or later you’ll regain your energy and find yourself back in action. Plus, we’re here to give you a boost. The December issue (Circuit Cellar 269) is packed with projects that are sure to inspire your next flurry of innovation.

Turn to page 16 to learn how Dan Karmann built the “EBikeMeter” Atmel ATmega328-P-based bicycle computer. He details the hardware and firmware, as well as the assembly process. The monitoring/logging system can acquire and display data such as Speed/Distance, Power, and Recent Log Files.

The Atmel ATmega328-P-based “EBikeMeter” is mounted on the bike’s handlebar.

Another  interesting project is Joe Pfeiffer’s bell ringer system (p. 26). Although the design is intended for generating sound effects in a theater, you can build a similar system for any number of other uses.

You probably don’t have to be coerced into getting excited about a home control project. Most engineers love them. Check out Scott Weber’s garage door control system (p. 34), which features a MikroElektronika RFid Reader. He built it around a Microchip Technology PIC18F2221.

The reader is connected to a breadboard that reads the data and clock signals. It’s built with two chips—the Microchip 28-pin PIC and the eight-pin DS1487 driver shown above it—to connect it to the network for testing. (Source: S. Weber, CC269)

Once considered a hobby part, Arduino is now implemented in countless innovative ways by professional engineers like Ed Nisley. Read Ed’s article before you start your next Arduino-related project (p. 44). He covers the essential, but often overlooked, topic of the Arduino’s built-in power supply.

A heatsink epoxied atop the linear regulator on this Arduino MEGA board helped reduce the operating temperature to a comfortable level. This is certainly not recommended engineering practice, but it’s an acceptable hack. (Source: E. Nisley, CC269)

Need to extract a signal in a noisy environment? Consider a lock-in amplifier. On page 50, Robert Lacoste describes synchronous detection, which is a useful way to extract a signal.

This month, Bob Japenga continues his series, “Concurrency in Embedded Systems” (p. 58). He covers “the mechanisms to create concurrently in your software through processes and threads.”

On page 64, George Novacek presents the second article in his series, “Product Reliability.” He explains the importance of failure rate data and how to use the information.

Jeff Bachiochi wraps up the issue with a article about using heat to power up electronic devices (p. 68). Fire and a Peltier device can save the day when you need to charge a cell phone!

Set aside time to carefully study the prize-winning projects from the Reneas RL78 Green Energy Challenge (p. 30). Among the noteworthy designs are an electrostatic cleaning robot and a solar energy-harvesting system.

Lastly, I want to take the opportunity to thank Steve Ciarcia for bringing the electrical engineering community 25 years of innovative projects, essential content, and industry insight. Since 1988, he’s devoted himself to the pursuit of EE innovation and publishing excellence, and we’re all better off for it. I encourage you to read Steve’s final “Priority Interrupt” editorial on page 80. I’m sure you’ll agree that there’s no better way to begin the next 25 years of innovation than by taking a moment to understand and celebrate our past. Thanks, Steve.

Elektor & element14 Partner for Embedded Linux Webinar at Electronica 2012

Want to learn more about Embedded Linux? You’re in luck. On Wednesday, November 14, Elektor and Farnell/element14 will partner to run an informative webinar on the topic at Electronica 2012 in Munich, Germany. If you’re at the show, you can attend the recordings for free. Register before October 31 to get free Electronica entry tickets from Farnell/element14.

Attendees should go to the Farnell/element14 stand (Hall 5, Stand 558) for the Elektor Academy seminar, which will focus on the latest developments on the innovative Embedded Linux board. You can watch the presentation and ask the experts questions. The webinar will be recorded and webcast a bit later.

  • Presenter: Embedded Linux expert Benedict Sauter, the board’s designer
  • Description: Benedict Sauter will take you through the design and update us on the latest applications.
  • When: Wed, November 14, 2012
  • Time: 11:30 CET
  • Where: Farnell element14 stand (Messe München, Hall 5, Booth 558)
  • Language: English

Visit the element14 page about the Elektor Academy event for more information and to register for a free entry ticket.

CircuitCellar.com is an Elektor International Media publication.