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America's Got Talent - "iLuminate" performance

 by wholder ¦  Wed Jun 01, 2011 8:34 am ¦  Forum: SparkFun Product Questions ¦  Topic: America's Got Talent - "iLuminate" performance ¦  Replies: 1 ¦  Views: 285

I saw this act on AGT last night: and wondered if the group was using any Sparkfun products. Logical candidates include: and perhaps some Arduino and XBee modules. Wayne

Re: windshield rain detector

 by wholder ¦  Wed Apr 27, 2011 10:16 am ¦  Forum: SparkFun Product Questions ¦  Topic: windshield rain detector ¦  Replies: 6 ¦  Views: 2168

See: and for some details on how "frustrated internal reflection" is used to detect rain. As the article states "The most common modern rain sensors...

Observations about free day

 by wholder ¦  Thu Jan 13, 2011 12:52 pm ¦  Forum: Sparkfun Promotions and Competitions ¦  Topic: Observations about free day ¦  Replies: 5 ¦  Views: 4497

I elected to take the earned credit because I had a feeling the servers would just not be up to the load. As it turns out, I was right, as it took numerous tries just to log in, get to the page with the button and then many more tries to get the button to register my selection. But, as I do web syst...

Re: Magnetic Core Memory for Arduino

 by wholder ¦  Wed Aug 25, 2010 10:30 am ¦  Forum: SparkFun Product Questions ¦  Topic: Magnetic Core Memory for Arduino ¦  Replies: 10 ¦  Views: 2615

The technique used to create the Apollo rope memory was also used commercially. One example is the Nixdorf "threaded ROM" which can be seen here: and the more advanced, user configurable "stick memory" which can be seen here: http://www.techniku...

Re: Magnetic Core Memory for Arduino

 by wholder ¦  Fri Aug 20, 2010 9:19 am ¦  Forum: SparkFun Product Questions ¦  Topic: Magnetic Core Memory for Arduino ¦  Replies: 10 ¦  Views: 2615

On a tangential note, in the course of learning about how magnetic core memory works, I stumbled across an article on how later model Seeburg jukeboxes (the ones made between 1955 and 1978) used magnetic cores to record the selections a user made. Apparently, pressing the 'B' and '7' buttons, for ex...

Re: Magnetic Core Memory for Arduino

 by wholder ¦  Wed Aug 04, 2010 8:49 am ¦  Forum: SparkFun Product Questions ¦  Topic: Magnetic Core Memory for Arduino ¦  Replies: 10 ¦  Views: 2615

When I worked at English-Electric-LEO-Marconi Computers at Kidsgrove, in the early 60s, there was a large room with about 50 ladies assembling core memories. They often used to sing hymns while they were working. Core memories were used on all our mainframes at the time, machines like the KDF9 and ...

Magnetic Core Memory for Arduino

 by wholder ¦  Mon Aug 02, 2010 8:08 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Magnetic Core Memory for Arduino ¦  Replies: 10 ¦  Views: 2615

Call this more of a nostalgia project, but I've designed and documented a simple circuit that use an Arduino Nano to magnetically flip a ferrite core between 0 and 1 state and read back the result. It's just a one bit memory, but the design is easy to scale up to larger arrays. With a little experim...

Re: Best Controller career-wise

 by wholder ¦  Tue Jun 01, 2010 11:16 am ¦  Forum: SparkFun Site Questions/Comments ¦  Topic: Best Controller career-wise ¦  Replies: 3 ¦  Views: 1503

Hey guys, knowledge of which controller is very helpful in embedded industry. I know 8051 & bit of ARM. Between ARM,PIC & AVR which controller has most demand in the current job senario? Thanx Forget learning a specific microcontroller, learn how to solve problems with a microcontroller. Employers ...

Re: Tiny 1-60 RPM motor solution for spinning Musical Box.

 by wholder ¦  Fri May 28, 2010 10:33 am ¦  Forum: SparkFun Product Questions ¦  Topic: Tiny 1-60 RPM motor solution for spinning Musical Box. ¦  Replies: 3 ¦  Views: 661

Try this little puppy:


Re: MP3 Trigger Problems

 by wholder ¦  Tue Apr 27, 2010 2:50 pm ¦  Forum: SparkFun Product Questions ¦  Topic: MP3 Trigger Problems ¦  Replies: 12 ¦  Views: 1519

I also purchased the original MP3 Trigger from Sparkfun, but have not yet completed the project that will use it. Is there some simple way for me to test if I'm going to have this problem?


Bungled worse than the Victoria's Secrets Superbowl Fiasco

 by wholder ¦  Thu Jan 07, 2010 11:05 am ¦  Forum: SparkFun Site Questions/Comments ¦  Topic: Over the 100k limit ¦  Replies: 1 ¦  Views: 1819

Oh, well...

Re: Oscilloscope recommendations?

 by wholder ¦  Mon Dec 14, 2009 2:59 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Oscilloscope recommendations? ¦  Replies: 5 ¦  Views: 1000

I'm not looking for a high performance o-scope, I'd rather optimize for dollars spent first. I'd prefer the unit to be freestanding, not attached to a PC. Right now, I anticipate the fastest signal I'll be analyzing would be around 500khz or so. I haven't received mine yet, but I have high hopes fo...

 by wholder ¦  Sun Dec 06, 2009 7:02 pm ¦  Forum: New Product Ideas ¦  Topic: I2C LCD (2x16) breakout ¦  Replies: 3 ¦  Views: 1478

Hmm... both these displays seem to be out of stock at Digikey. Hardly makes sense to build a breakout board for a part that's not readily available.

Re: What about with accelerometers

 by wholder ¦  Fri Oct 30, 2009 1:41 pm ¦  Forum: New Product Ideas ¦  Topic: New 3 Axis Gyro ¦  Replies: 10 ¦  Views: 3498

Those are neat! I would be curious to see the datasheet whenever they make it public.
There are some specs here:


New 3 Axis Gyro

 by wholder ¦  Mon Oct 26, 2009 11:59 am ¦  Forum: New Product Ideas ¦  Topic: New 3 Axis Gyro ¦  Replies: 10 ¦  Views: 3498

Can't wait to see this on a breakout board: