Alternative software for the HV Rescue Shield

February 13th, 2012 by Jeff

Dennis writes…

I thought I’d share with other users of the HV Rescue shield an enhanced Arduino script I have written, based on Jeff’s original software v212.

The new software retains the look and feel of the original, it can still be run in interactive and non interactive mode and starts by requesting the AVR family as before. The existing fuse settings are then printed along with the device signature and lock bits. After this the user is presented with a menu of functions.

The E command allows the user to erase the AVR.

The F command allows the fuses to be set as before. OK or fail will be printed depending on the success of the operation.

The R command allows a block of the flash memory to be dumped to screen. The user has to input the required start address in hex.

The P command is similar to the R command but operates on the EEPROM

The W command performs a simple test of the flash by writing a small block of data to it and checking it programs correctly. The user has to input the required start address in hex, which must be the first byte of a page (see device datasheet for details about page size). The user can view the test pattern written by using the R command to read it back.

The T command performs a similar test on the EEPROM but with a different shorter 4 byte pattern as EEPROM page sizes are smaller.

Dennis posted a link to his alternative software in the HV Rescue Shield support forum.

Thanks, Dennis!

PCB / Electronics Workbench Flickr Pool Screensaver

February 13th, 2012 by Jeff

PCB/ELWB Collage Screensaver

Interested in setting up a cool screensaver that will display a continuously changing collage of photos from the Electronics Workbench and Printed Circuit Boards flickr pools?

Here’s how to do it in Windows:

First, install Picasa.  This should install the Google Photos Screensaver.

Next, open the Windows Screen Saver Settings control panel. (Type “screen saver” into the Windows 7 search bar, open the Windows Control Panel and navigate to Appearance and Personalization->Change screen saver, etc.)

Select the Google Photos Screensaver and click Settings…

Set the Visual Effect type to Collage, and adjust the Change picture every… slider to taste – I suggest starting at 3.0 seconds.

Uncheck all options except Photos from public sites, then click Configure…


Copy and paste each of the following RSS feeds into the Additional photo feed sources dialog, and click Add after pasting each one.


http://api.flickr.com/services/feeds/groups_pool.gne?id=812901@N20&lang=en-us&format=rss_200

http://api.flickr.com/services/feeds/groups_pool.gne?id=1767402@N25&lang=en-us&format=rss_200

After adding both feeds, make sure the entries for each them are checked and click OK. Then click OK again to return to the Windows Screen Saver Settings window.

Click Preview and photos from the Electronics Workbench and Printed Circuit Boards flickr pools should start appearing on your screen. If so, the screen saver is working.

Click OK to close the control panel and you’re done!

If you’re interested in setting this up in OS X, the process is very similar – just add the RSS Feeds to your screen saver settings as documented here.

Have fun!

Tutorial: Geiger Counter Data Logging

February 10th, 2012 by Jeff

Logging data from the Geiger Counter Kit

So, you want to log data with your Geiger Counter kit?

Here’s how to do it!

Read the rest of this entry »

Pimp your Geiger: Add a superbright LED

February 9th, 2012 by Jeff

Pimped Geiger Counter

Want to give your MightyOhm Geiger Counter Kit a little more sparkle?

Replace the ordinary indicator that comes with the kit with something special – a superbright LED!

Here’s how:

Read the rest of this entry »

A visit to the Thomas Edison National Historical Park

February 6th, 2012 by Jeff

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Last month, on my way back home from 28C3, I had the opportunity to visit a truly amazing (and maybe underappreciated) historic site: the Thomas Edison National Historical Park.

The park, which is located in West Orange, New Jersey, includes Thomas Edison’s laboratory complex and his Glenmont mansion. I didn’t get to see the mansion, which frankly was less interesting to me (although I hear it features such novelties as a remotely-switched electrically-heated birdbath). Instead, I decided to focus my tour on the laboratories:

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The remaining laboratory buildings are actually only a small part of what used to be a huge industrial factory and research center that spanned several blocks. Only a few of the original structures remain, the rest having been sold off and destroyed to make way for new development.

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Here are just a few of the businesses that used to be located beyond the complex gates. One has to wonder what the “La Compania Edison Hispano-Americana” did:

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Before I forget: This is not where Edison invented the light bulb. Or the phonograph. This is where Edison refined his original phonograph into a commercially viable product, developed the kinetoscope and several other motion picture devices, and developed Nickel-iron-alkaline storage batteries that powered early electric vehicles, among may other things. Many of Edison’s early inventions were developed in his Menlo Park laboratory in what is now called Edison, NJ.

With that out of the way, back to the tour…

My tour began in the Chemistry Lab.

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The lab is (not surprisingly) wired with DC, and there are many DC outlets sprinkled around the lab:

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There are chemicals everywhere. Storage cabinets on the walls are filled with hundreds of glass bottles, organized by base element (Antimony, Lead, Magnesium, Calcium).

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The lab has been beautifully restored:

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I last visited here over 20 years ago with my grandfather, and while my memories are fuzzy, I do not remember the facilities being in this condition. This is likely because the complex has seen significant restoration work in recent years. Just outside the chemistry lab, there is a small square on one wall that is still in unrestored condition:

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After completing the chemistry lab tour (which I believe is the only guided tour at the facility), I moved on to the building that houses Edison’s library, a room bathed in incandescent light:

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Very prominently featured in the library is this angel, who is holding aloft a lightbulb. I sense more than a little bit of ego here…

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In one corner, a cubic foot of copper, a gift from a group of mining and smelting companies, who were no doubt overjoyed by the success of Edison’s electric lighting system and other inventions.

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Here is Edison’s desk, though apparently he did not spend much time here, preferring to work upstairs in a more modest room:

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Moving on, I next visited the storeroom, home to not only tools but also samples of hundreds if not thousands of natural materials. It is reported that this storeroom contains everything from a tortoise shell and elephant hide to “the eyeballs of a US senator”:

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The storeroom is the gateway to the most spectacular room in the complex, the heavy machine shop:

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Power for the machines originates at two enormous motors located in the back of the shop:

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It is then transmitted through a terrifying network of pulleys and exposed belts to each of the machines. This was not a safe place to work:

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Upstairs is the precision machine shop, where the machines are smaller and more unusual:

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Just off the precision machine shop is the room where Edison preferred to work, surrounded by chemicals and his experiments, conveniently close to the machine shop foreman’s office:

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Another room upstairs housed a recording studio for what was likely the world’s first record company. It is amusing to think that records were being recorded right next to an active machine shop, but apparently the sensitivity of early recording devices was so low that they did not pick up background noise.

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You can imagine a performer belting into one of these primitive devices, surrounded by many different types of recording cones, suitable for various instruments:

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The upstairs halls are lined with artifacts from the Edison company. The first phonograph:

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A pair of Thomas Edison electric irons:

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Early Christmas lights:

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Back outside, here is the Black Maria, Edison’s famous motion picture recording studio. The first studio of its kind, the roof opens and the entire building can be rotated to capture the maximum amount of outside light, which was required by early movie cameras:

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Apparently during WWII the Edison Company saw itself as a target, and constructed this bunker to protect and preserve documents and artifacts in their collection:

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This concluded my tour. There are many more photos of the laboratory complex in this flickr set. And if you are ever in the area, I highly recommend paying a visit to this historic site.


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