OK, I did some more hot-gluing today and I have a DC motor/Encoder system hooked up now. It's about $100 parts used including the controller. Probably $250...
Jeff Sampson, you may want to read up on this. It is an interesting article on how to compute the center of a laser line with sub pixel accuracy without...
I briefly looked at the article. The method I am using is what they say "detecting the peak pixel intensity across the laser line (resulting in pixel...
Jeffry Sampson
jsampson@...
Apr 2, 2008 3:26 pm
1898
Hi Alan, Some questions: The K's are gains? What is Adot and Xdot? (derivative with respect to time?) Dr. Durfee is a prof at the U? You using a JR Kerr chip...
I am guessing Alan will be using the Wiring board, which is like a basic stamp with code written in JAVA, to read the encoder channels and output PWM and...
My educated guess is that: A = Angle A dot = Omega, the speed of the encoder, or the angular rate of the encoder (think RPM) X = position of stage X dot =...
... Yes. ... Yes, these are the rate of change of the angle and position. (angle_last_sample - angle_this_sample) etc. ... Yes. He's my area-specialist for my...
Anyone up on the latest in wifi. what is all this draft n business about???? Internal Virus Database is out-of-date. Checked by AVG. Version: 7.5.519 / Virus...
... new bunch of mathematics and a 2nd antenna to out-speed 802.11g (248Mbit as opposed to 54Mbit). Not yet official, but manufacturers are jumping the gun,...
The hardware is complete and I have a simple PD "cart"-position controller running on the Wiring board. It's pretty buzzy since I've spent about 15 seconds...
Ok so..... I need to shoot a wifi signal 125-150 feet from my living room window across the street at a 33 degree angle to an office building through some ...
... Trees are bad news for wireless networking. They contain *lots* of water. Seen what happens when you put a huge chunk of frozen meat in the microwave? It...
I convinced the company to drop USB and instead use an external Linux board connected via Ethernet. I am protyping the system using PC's, but I am trying to...
My advice is to try it and see what happens. See what channels are being used the most and use another one. The channels overlap so really only channels 1, 6,...
... Your memory specifications sound pretty small for any form of Linux. Maybe uClinux will run in something that small. (Maybe you meant mega bytes instead of...
... 16 MHz is 16 times faster than an Apple-II. That fast? ... That's about 10 times too small to hold Linux. ... 57,600 Baud kind of fast, or 1,200 baud kind...
... Oh, that reminds me. Here is something else that just came out: http://www.tincantools.com/product.php?productid=16133 It doesn't appear to have Ethernet...
I was very surprise to see that I could connect as is just using the stock router antenna and the built in wifi card in my laptop! I could see the router at my...
Don't worry about the FCC compliance thing. FCC compliance doesn't apply to homebrew stuff unless you sell it or make more than five of them, but if you screw...
I remember being taught in 7th grade home economics that microwave signals are about the "diameter" of a pencil and can not escape the screen pattern of the...
... The microwave oven door uses a tuned tank channel. This is a lot easier to manufacture than a gold plated copper gasket. The tank is very selective and...
Dave, A corner reflector might just be what you need. Its has about the "viewing angle" you need and should be super easy to construct. The gain is about...
15 db is about 30 degrees. As the gain goes higher the beam is narrower. That is the antenna trade-off. 30 degrees is pretty easy to point. Putting the office...
I don’t know if this will work or if it will get kicked back by the sever here, but, if this works, there should be a photo attached below this with hands...
I would get one directional antenna for one side, the office or the house. Probably you have more flexibility with your house. Put the office router as close...
Bruce, I'll be working on this tonight. I can't get my head wrapped around how to convert from "motor-torque" (which is the output of the control-system to the...
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