Domain: nerdvest.com
Stories and comments across the archive that link to nerdvest.com.
Comments · 7
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Re:Great!
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Re:Great!
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Re:Great!
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I personally like high energy home brewCheck out the magnetic gun club or those guys who make small change.
I myself have made a low velocity coil gun and have a more powerfull one in the planning stages.
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Re:Distributed sensor/actuator controlThese comments are spot on. I'm also using small MCU devices for anything that needs hard real time CPU responce. That is motor control, touch sensors, etc. They are cheep and you can easily dedicate them to the task. You can use RS-232 links and have a serial port for each, or you can use RS-485 and use common links. I have two RS-485 links. One for the motors and the other is for touch sensors and slow update devices like compases. I also have a RS-232 set aside for GPS in the future. My central processor is currently only a 486 with Linux loaded. Rather slow, but it's fast enough. I have plans to replace it with something really fast so I can start to do vision work. But that won't happen for awhile. Standard PC hardware isn't quite fast enough yet.
With the PIC CPUs, you can get cheep C compilers. The C2C compiler is horrible, but if you combine it with GCC's C preprocessor it can be made passable, but just barely. The guy who wrote it needs to get himself a copy of K&R and really read and follow it. I do all my development under Linux and download code to the PIC using the PICSTART programmer. With another program (picp) I can use the PICSTART programmer under Linux. This allows me to do all my development under Linux.
For you host processor and motherboard you can go cheep and use and old PC, but then you have to have a huge robot. Otherwise there are many PC compatible single board computers out there. You can even find then surplus. Buying new you should be able to stay under $500 easily and still get a pentium class CPU. The main thing when selecting a board ig getting enough memory. You want atleast 16MBytes due to some of the current install scripts with the available distributions. I only have 8MBytes on my robot, but I loaded linux by putting the HD in another system and only copying the parts I wanted.
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Re:Here's an interesting idea...Unfortunately you can't always unplug the computers as you are away from home or running servers on them.
I run a paranoid power system. Everything goes through the sacrificial surge protector. After that is the TripLite line conditioner. Then there is a UPS for each computer. Computers are either directly pluged into the UPS or have a surge supressor between them and the UPS. The phone line for the DSL has it's own surge supressor too. After my appartment building was hit I didn't have to replace any of my electronics, but I did replace the sacrificial surge supressor and line conditioner. Other people in the building were replacing everthing.
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Re:getting started young
Kinda reminds me of my first astronomy class. I hadn't even made it to my freshman year of high school and I had 4 credits of Astronomy from the local community college.
Many people have given good advice above. I'll mainly just second their comments. The order I'd proceed in is.
First item, a good beginners star atlas.
Second item, warm clothing.
Third item, many nights in the country just learning the stars and constelations.
After that go and get a good pair of binoculars or a good telescope.
Last, but not least. As your doughter is so young, you will need to be there as a source of infromation. You'll need to learn alot to help guide her in the early years.
Now for some Links. The first two have good beginners information. Some of the links below may be dead. I just quick cut and pasted them from the astronomy section of my Interesting Places page.
- Astronomy Mag. (www.astronomy.com/home.asp).
- Sky & Telescope Mag. (www.skypub.com).
- Minnesota Astronomical Society (MAS) (www.mnastro.org).
- The Telescope Shoppe (www.telescopeshop.com), 3402 Federal Dr., Eagan, MN, 651-688-7335. Yes this is a local Twin Cities telescope shop. They have a map on their site showing where they are. They are tucked in the lower level along the side of the strip mall they are in. The store is small and easy to miss. If your at the corner of Yankee Doodle RD and Federal Dr., park in the lot to the south east. They are a short stones throw from the intersection.
- Telescope making links
- Many good links on making AltAz mounts (zebu.uoregon.edu/~mbartels/altaz/altaz.html).
- ATM's resource List (www.freenet.tlh.fl.us/~blombard).
- Astronomy-Mall.com (www.astronomy-mall.com/Astronomy-Mall).
- Stellafane (www.stellafane.com).
- Terrestrial Planet Finder (tpf.jpl.nasa.gov).
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Many Images of the moon (www.seds.org/nineplanets/nineplanets/pxmoon.html
) . - Solar Views (www.solarviews.com).
- Planetary Image Atlas (www-pdsimage.JPL.NASA.GOV/PDS/public/Atlas).
- Hubble Space Telescope Archive (oposite.stsci.edu/pubinfo/pictures.html).
- Hummble Site (hubble.stsci.edu).
- StarStuff (www.starstuff.org).
- SpaceRef (www.spaceref.com), Your space refference.
- Astronomy Picture of the Day Archive (antwrp.gsfc.nasa.gov/apod/archivepix.html).
- SkyView (skyview.gsfc.nasa.gov) virtual observatory.
- 2MASS (www.ipac.caltech.edu/2mass/) and (pegasus.astro.umass.edu/GradProg/2mass.html) Two Micron All Sky Survey.
- Large Angle and Spectrometric Coronagraph Experiment (LASCO) (http://lasco-www.nrl.navy.mil/lasco.html).
- AAVSO Network to Search for Optical Counterparts of Gamma-Ray Bursts (www.aavso.org/grb.stm).
- High Altitude Observatory (www.hao.ucar.edu).
- Asteroid Comet Impact Hazards (impact.arc.nasa.gov).
- Unusual Minor Planets (cfa-www.harvard.edu/iau/lists/Unusual.html).
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Potentially Hazardous Asteroids (cfa-www.harvard.edu/iau/lists/PHACloseApp.html).
& nbsp; Of particular interest to me are LB16 and AN10 which will pass at a distance closer than the moon's orbit. LB16 currently only has one opposition charted so it's predicted orbit will likely change as new data comes in. It's expected to swing by in 2004. In 2027 AN10 will visit earth. It's orbit is calculated with three oppositions meaning it't much more likely to really showup ontime and in place. With further data LB16 could either get closer or farther away. When AN10's orbit was first predicted (only one opposition at the time) it's error envelope included earth. With further data it was found to just pass within the moon's orbit and miss the earth. -
Forthcoming Close Approaches To The Earth (cfa-www.harvard.edu/iau/lists/CloseApp.html).&nb
s p; This is the document to look at when you want to know who will visit next and how far away. It has all close approaches to 0.2 AU away from earth or within 20% of the distance of between the sun and earth. On Sep 19th, 2000 we will have a visiter at 0.0477 AU and on Oct 31st anotehr one will pass at 0.07386 AU. LB16 and AN10 are expected to pass at around 0.25% of the distance between the sun and earth.
- Mars Global Surveyor (mars.jpl.nasa.gov/mgs/index.html).
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Mars Orbiter Laser Altimeter (MOLA) (ltpwww.gsfc.nasa.gov/tharsis/mola.html).
There are full data on the shape of Mars including 1 degree and
.5 degree elevation data sets. - Planetary photojournal by JPL (photojournal.jpl.nasa.gov).
- NASA's Origins Program (origins.jpl.nasa.gov).