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News - According to Pete, Specia… | about 7 months ago

The PWMs are all bit-banged off the instruction clock in for/while loops. See the line “if d <= pulse” right after the “while trigger” loop. Looks a lot like some my own one-hour-project hack code, don’t expect everything to be properly thought out. Pretty neat project even so.

Product GPS-10890 | about 7 months ago

Looks like the GPS-logging cat collar can finally be a reality!

Product PRT-10687 | last year

This is not the type of adhesive used for spacecraft. Silicone adhesives evaporate in a vacuum and stick to telescope optics, and are impossible to clean off. We are very strict about keeping silicone out of our labs at NASA.
It will work fine for non-vacuum applications.

Product BOB-10344 | about a year ago

I just did the calculations and I think with a 49 kHz oscillator input, it will tune on 129-168 MHz. No idea if this will actually work, or if the LNA response at those frequencies is too poor, but it might be worth a shot.

Product BOB-10344 | about a year ago

I second this request. Does anybody know of a good miniature receiver for the 144-148MHz amateur band? I think with these digital tuning chips, the local oscillator is derived from the crystal so you would have to change the crystal/oscillator input frequency to change the tuning range. I don’t think it would work moving all the way to 70cm, but it might work okay on 2m.

Product PRT-10300 | about a year ago

I’m surprised nobody caught this yet. I don’t think the TPS61200 is quite good for 600 amps…
Also, I second the suggestion to add a coulomb counter/fuel gauge chip to the mix.

Product BOB-09168 | about a year ago

Answered my own question. On one of the AUV forums are screenshots of it overlayed on a color image. Awesome!

Product BOB-09168 | about a year ago

Question to those who have used this before:
If you feed it a color video signal, does it convert it to monochrome in the process of overlaying text? Or do you get monochrome text on top of color video?
Thanks.

News - Leftovers From A Very Ful… | about 2 years ago

Sorry to hijacked this thread, but I can’t help but reply.
By your argument, it is simply the word “necessary” that is out of place. You did not dispute that the sharing of ideas can cause lasting change; you only gave a list of other things with similarly far-reaching effects. Everything you listed has undeniably negative side-effects—loss of life, concentration and abuse of power, or the exclusion of potential contributors. You could interpret the author’s point to mean that the sharing of ideas is necessary to affect change in the broadest, least exclusionary manner without as many negative consequences. The author merely assumed that those criteria were obvious to the reader.

News - Solar Powered Bird Tracki… | about 2 years ago

The FAA rule on cell phone use specifically refers to “aircraft” and is intended, at least according to Wikipedia, to avoid interfering with flight control systems. EMI is probably not a big problem when flying on a bird, and I doubt that a wild bird is an aircraft.
Somewhere I heard that a cell phone operating at ten-thousand feet would cause problems for the towers because many towers would see it at the same time and they would get confused as to which one should talk to it. But there may be safeguards against that, and birds don’t fly at 10,000 feet anyways.