khearn

Member Since: September 18, 2006

Country: United States

  • The comment about using a datalogger is a good plan. You should also have a sensor outside the car, in the shade (probably under the car is your best bet). I did some similar testing when I got my van. It’s got solar panels on top and a vent fan in the ceiling, but I wanted to be completely sure it would be safe to leave my dogs in it on camping trips when my wife and I went someplace like a museum or shopping. With reflective covers on the windshield and side windows, and curtains on the other windows and the fan blowing, the temperature only got a degree or two above ambient. But without a measurement outside to tell me the ambient temp, I really wouldn’t have known how effective it really was.

  • I’m not sure this is the problem, but it looks like your foil is wider than your magnet, so the electrons get pushed a little to the side, then leave the field and go back to the direction the electric field is pulling them. Try a narrower foil (or a wider magnet).

  • Heh. I just Googled “ENIG soil” and the top result was this page. :) Here’s the Wikipedia article on ENIG. It’s basically a method of gold plating to prevent/reduce corrosion.

  • I’m not clear on what exactly “anodized zinc” is. Usually when one sees “anodized”, it means it’s mainly steel with a zinc plating applied by a process known as anodization. Is that what this is, or is it zinc with some other metal anodized onto it?

  • What’s the color temperature of these? Are they warm or cold white?

  • Two processors is no good. If they don’t match, which one is wrong? You need three, so two will match and one will be different. But I suspect Robert is right about it not being likely to come up. If he does encounter that much radiation, he’ll have other worries than his logger.

  • I think you’re underestimating the amount of effort just slapping things together would be if you want to come up with something so easy to use. Yes, something like this could be made cheaply using other parts put together, but I think it would be a significant project on its own. If you are working on a project and need an interface, starting another project to create the interface may not always be desirable. Before long you may find yourself in Tibet, shaving a Yak.

    On the other hand, I do find myself hesitating to spend 2-4 times as much on an interface compared to what I’m spending on the actual computer. But that’s more because the Arduinos and Raspberry Pi are so darned cheap. Any sort of display for a RaspPi costs more than the RaspPi. Heck, even connecting a Pi to a non-HDMI monitor can cost more for an HDMI->DVI converter than the Pi costs (if you don’t shop around). I find this to be a difficult psychological barrier to cross. The 4D screens seem like a reasonable value for what they offer, if only the devices they connect to weren’t so much less expensive.

    Spending $180 for a computer plus display doesn’t sound bad, but $35 for a computer and $145 for the display just seems wrong. But that’s not 4D or Sparkfun’s fault, it’s all in my head (and I suspect I’m not the only one).

  • Nate’s clever plan for fitting more engineers into the existing office space seems to be working so far.

  • Yeah, that thin dry air causes problems for baseballs, too.

  • For those who don’t want to search the datasheet, the max range is 5 meters, and it returns the distance to the closest target it sees.

No public wish lists :(