Archive for month: October, 2011

A Halloween Treat: What to do in a Zombie Attack

October 31, 2011 | Link of the Day | By: Mark VandeWettering

Happy Halloween everyone! I’ve kind of got zombies on the brain, which is better I suppose than having zombies munching your brain. I blame it all on the crew for the Zombie Tech podcast, despite their excellent taste in guests. Luckily, there is all sorts of good information on what to do in a Zombie […]

A Constant Current LED Driver…

October 31, 2011 | electronics | By: Mark VandeWettering

While tinkering with my ATtiny13 Pumpkin Project, I ended up using a fairly inefficient circuit: the same amount of power is dissipated in the current limiting resistor as in the LED itself, which mean that at best, the efficiency would turn out to be around 50%. In reality, some power is consumed by the switching […]

Making an ATtiny13 Powered Pumpkin!

October 29, 2011 | electronics, My Projects | By: Mark VandeWettering

Happy Halloween! Here’s a little project I’ve been working on for Halloween… I’ve created a separate page with the details: it’s pretty rough right now, but I’ll try to tidy it up as time goes on. Feel free to mail me with any direct questions to serve as incentives to documenting the project better. brainwagon […]

CQWW SSB Contest This Weekend!

October 28, 2011 | Amateur Radio | By: Mark VandeWettering

I’m not much of a contester (not any kind, in fact) but this weekend is one of the biggest: the CQWW SSB Contest. Expect the bands to be completely awash with chatter from 0:00 UTC October 29th through 23:59UTC October 30th. I doubt I’ll do much, other than maybe hookup my SDR-IQ to scan around […]

Baseball and Pascal’s Triangle

October 28, 2011 | Baseball, Math | By: Mark VandeWettering

I was standing in Tom’s office, and asked him a simple probability question (and a timely one, given the World Series): If the odds of a particular team winning against their opponent is some probability p, what are the odds that they will win a 7 game series? If you had any probability at all, […]

St. Louis hangs in, there will be a Game 7 tomorrow!

October 27, 2011 | Baseball | By: Mark VandeWettering

Absolutely the most amazing World Series Game I’ve seen. I’m speechless. My words aren’t sufficient: I’ll post some links when I find someone better than me to put the game in perspective. Amazing.

Electromagnetic Propulsion of Ships and Submarines

October 27, 2011 | Amateur Science | By: Mark VandeWettering

The other day, I was watching The Hunt For Red October on TV. Through some odd coincidence, today I found a link to an article that was published in Popular Science back in 1966 on a silent electromagnetic drive for submarines, just like the “caterpillar drive” of the Red October. I didn’t realize that this […]

“MOAR POWER!” … Wait… I mean, “LESS POWER!”

October 27, 2011 | electronics | By: Mark VandeWettering

My electronics experimentation has brought a couple of comments from people I’ve met who have much greater experience and knowledge than I. For instance, in response to my posting of a schematic for flashing a rather large, powerful LED yesterday, I drew the attention of Mike Colishaw on Twitter: @brainwagon Hmm, wasting half the power […]

Approaching 100K views this year… Thanks!

October 27, 2011 | Amateur Radio | By: Mark VandeWettering

This morning, I consulted the little revolving map over there in the left column, and found that I had passed 99,000 views. I reset that counter back in February, and since then nearly 100K people (or more realistically, 99K robots and maybe 1K people) have viewed a page here on brainwagon. I’d like to thank […]

Nifty paper on Batting Average…

October 27, 2011 | Baseball, Math | By: Mark VandeWettering

For some reason, I never do much reading about baseball during the season itself. But as the World Series approaches its end (still hoping for a game seven) I have started to dust off some of my reading materials. A couple years ago, I mentioned this work by Lawrence Brown on this blog, but the […]

I make things too hard… Thanks Lee…

October 26, 2011 | electronics | By: Mark VandeWettering

Nothing is quite so humbling as someone coming in and showing you that you are making your problem way more complicated than it really is. Lee pointed out that I was overthinking it: that a simple 2N2222 would work just fine, and indeed, I went back over it, and realized he was right. I entered […]

On using an IRF510 as a switch…

October 26, 2011 | electronics | By: Mark VandeWettering

This posting begins with a caveat: while I’m pretty experienced as a programmer and software engineer, I’m actually a bit of newbie when it comes to electronics. I’m entirely self-taught, and because of my inherent laziness, I find it hard to learn anything before I actually need to know it. This means that I often […]

Using an Arduino as a programmer for the ATtiny13

October 23, 2011 | Arduino | By: Mark VandeWettering

I’m pretty much near the end of where I wanted to be for the Arduino/Gameduino project: all the major functions that I originally wanted to include are in and working. I’ll be doing a video about it shortly, so I’ve begun to think about what my next project could be. While doing this project, I […]

My IC-735 makes it’s first contact: T32C on 17m…

October 22, 2011 | Amateur Radio | By: Mark VandeWettering

A few months ago I acquired a used IC-735 from my boss, and other than getting it hooked up and using it for the occasional bit of RX, I haven’t actually powered it up and done any QSOs with it. Part of the reason is my inherent “mic-fright”, but I also know that my impossibly […]

Altimeter Module MS5607

October 21, 2011 | High Altitude Balloon | By: Mark VandeWettering

Once I get my current project off my table, I’m going to start working more on the payload for a high altitude balloon launch. Today, I noticed that Paralllax added a nice little atmospheric pressure sensor. It claims to have a range of about 10 mbar to 1200 mbar, which covers pretty nicely the range […]