bGatti's Posts (40)

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Maker Fair NC

Make Magazine first annual East Coast Maker Faire? was held yesterday in Durham, NC. I made the 3 hour trip from Charlotte by amtrak and brought my daughter along for the experience. It was a good event - some 2000 attendees. The local Arduino club and Aerobatic Robot clubs were well represented, with a laser-cut quad in progress and several Arduino breadboard affairs. There were plenty of Sparkfun objects (LED button squares, pressure sensors etc...) A very interesting presentation was the model RC warships with working 1/4inch caliber cannon, and balsa siding for serious dogfights (though they must have a different name). There were several makerbot/repraps in attendance including one of ~17 Mendels in the world. There was a live demo of vacuum forming some milk carton plastic over a peanut-butter jar with holes in the lid (heat the plastic with heat gun, hold in Popsicle frame, lay over object/vacuum when plastic glosses into transparency.) Fun event, good time had by all. I see the site now has some Flicker links...
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RE: The Long Tail as applied to Atoms (the new bytes)

Struck as I was by Chris's report in The Long Tail that sales of obscure items were outpacing sales of "hits", it seems trivial to conclude that economic growth - should we be so lucky - would not only come from "small business" generally, but from products for small markets in particular. While the the Long Tail explanation - that distribution and advertising costs are low - holds for bytes (songs, software, "apps", search, etc. . .) My question is whether this trend holds for Atoms, specifically small electronics like Ardupilot.

I'm wondering if Chris's research for the Long Tail was able to quantify the effect of fixed regulatory costs, like the FCC, the FDA, and related bureaucracies which are burdensome for large manufacturers, but completely crushing for products at the end of the tail. If the only way to avoid regulation is to deliver intentionally defective products (the Japanese have a legend of a painter so great, his painted birds would spring to life and fly off the page, and to this day, Japanese painters show homage by leaving their paintings a few strokes incomplete) - In a sense, we, at the long tail are required to ship products, like Japanese painters, as incomplete, unworking, experimental etc. . . , or face say a one million dollar fine like the FCC levied on Behringer even though their audio equipment was in full compliance and tested in Europe.

I know first hand that some successful electronic houses will simply not produce finished consumer goods due to the burden and risk of regulation - but what I don't know is how many potential atom making products and their associated jobs are lost at the long end of the tail?




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Only you can prevent UAV patent trolls.

I was researching prior art for a fully redundant motor/ESC/Battery device, and came across this patent for the the Segway ESC by Dean Kamens group (DEKA). And I realized that given enough money and an interest in a particular field, these companies could patent the obvious and make open source a difficult proposition.In response to the risk of patent trolling in the arena of DIY Uavs, I propose we make an effort (periodically) to indulge in some high concept - think tank level - ideas publicly (blogging), on the grounds that failing to do so might leave room for patent trolls.I also thought the recent (iRobot) entry into this field would make an excellent thematic starting point with bridge inspection. Other than the obvious photographic data of a bridge - what data could a UAV collect, or sensors could a UAV place and service that would identify metal or concrete fatigue of a structure? Vibration, conductivity, spectral response, current leakage, isolated heat from friction (ir), geometric deformation by n acoustic transponders. etc...Happy Winter Solstice...
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Atmel v Microchip v Freescale

Having now worked with all three uControllers and their respective IDEs, I thought it would be beneficial to start a milestone summary of my observations.To begin, I recently went back to the Microchip PIC family on account of their superior battery life (ultra low watt sleep) - which it seems is a full order of magnitude better than freescale or atmel. I note that microchip has recently? added a C compiler to the free IDE, in addition the PICs now come with a matrix multiplier which increases the speed of multiplication to a single cycle, this they say is on par with DSP speeds, and I think quite relevant to the UAV community as these applications are multiplication-intensive, and often cpu bound.IDEFreescale - nice processor wizard makes setting up peripherals easy - step-through debugging. Supports real USB devices.Atmel (Arduino) IDE sucks frankly, no step-through debugging, 2 processor selection. - Arduino is stuck in FTDI-landMicrochip - now supports step through debug on all modern flash uControllers from C source. Supports real USBCyprus Psoc. Frankly I wet my pants. PSoC has cool features like a programmable gain Op Amp, and now some higher current outputs and HighSide drivers integrated? - but the complexity and learning curve look steep, in addition to which the noise aspects of the PGA seem unusable for a wheatstone bridge for example. It's more of a Machine descriptor IDE, than a sequential language. Reminds me of the Parallax Propeller, but the Cogs are analog.ADCFreescale 12 bitsAtmel / Microchip 10 bitsCyprus - Include signal conditioning onboard, (ie gain and filters)?Propeller fuggetabouditUSBMicrochip will sublet it's USB Id'sFreescale, good USB Support, USB ID's are prohibitively expensive.Atmel/Arduino (fuggetaboudit)Learning CurveArduino is far and away the winner here.Next are the PIC Basics - which are easy but expensive.Freescale in C is not bad - free with excellent entry level packages (ie Spyder).Microchip recently bought Hi-Tech (pdfsucks) so I expect the PIC in C to improve. It's already free and usable, though installation requires it's own webinar.I'd like to hear how these observations may compare to others out there who have used multiple toolchains for entry-level ucontroller projects.
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11496756.jpg

Kill Devil HillI was driving home tonight and thought how cool would it be if the RC/UAV community worked together on a small model of the Wright's plane, with an autopilot that would repeat the flight path of the first airplane for visitors. It's a tragically quiet monument, and it would be much improved by a regular flight demonstration. There is plenty of space, and the flight path is always the same 90 seconds. Would it be hard to get clearance, sure, but if any hobby project had a chance of getting flight clearance, I should think a flight path of 50 feet elevation might stand a chance, its a good cause, and a genuine public benefit and we could kill the FAA in the media if they crossed the project.I was thinking to split the cost of a few stock models and send parts of it to various RC clubs for assembly, while DIYDrones could collaborate on the controls - then a kick off meeting at Kill Devil Hills to assemble the plane parts with the electronics, and turn over the project to the museum staff. I think if it had a small rail launch, it could be push-button easy.Anyone think we could pull it off?
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Three Cheers for Chris and Jordi

For three wins:Ardupilot Team vs. TreesArdupilot 2 Trees 0
Find more videos like this on DIY Drones
For those that missed, it, today's Sparkfun event was a smash, literally and figuratively. It turns out that U(A)V's of all stripes have the same propensities as Charlie Brown kite. Aside from the Trees into which Jordi scored direct hits, the wheeled varietals made their own attempts to climb the Sparkfun forest.The wind certainly made itself known, and my first impression of the ardupilot (with pitot) was that it had very stable flight characteristics, wind notwithstanding, and that the waypoint acquisition was the low hanging fruit for improvement. I suspect the wind had decreased the accuracy outside the waypoint margin, resulting in several fly-arounds - but when the accuracy came withing range, it was quite effective in circling the building.
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Ardupilot Shield

So here is a first pass at a Shield for the Ardupilot capable of hosting many of the 3v devices available at Sparkfun.Xbee Pro3v GPS - externalVenus GPS module with chip Ant.2 Axis Gyro3 Axis AccelA Plug for the IR Sensor ModuleThe Board needs more work etc,... But I thought it would be invaluable to put something up as a conversation starter.Eagle Files...OS - Credit: ArduPilot base board for pin locations etc ... Thanks Everyone (Help anyone?)
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Continental Flight - Autopilot right / Pilot Wrong?

http://www.bloomberg.com/apps/news?pid=20601103&sid=aK22vWGF.UNw&refer=usThis report of the Accident suggests that the rudimentary Autopilot (actually a pilot assist function that gently pushes the stick in the right direction during a stall) - may have been working correctly, and the Pilot reacted by pulling the plane into a 30 degree up attitude, what follows a 30 degree attitude on a flaps-down plane at landing speed is obvious enough.So I propose that at some point, computers will be better able to calculate the physics of flight in real time than any human pilot, and much better than the average fear-afflicted human pilot. Already, the more complicated airplanes are flown only by computer, and not by pilot (Space Shuttle on Reentry etc...)Have we not passed that point? And is the continued reliance on Human Operators contributing to Air accidents?
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10x Cheaper/lighter Airspeed Indicator

Given that an Airspeed Sensor costs about $12, I though it worth proposing an alternative: 2 temperature sensors and a resistor. Couple the resistor to one temperature sensor, and induce a voltage to generate heat. Place the coupled part in the airstream, now compare the temp of the one sensor against the ambient temperature; the difference is relative to airspeed. Cost $1.20; Weight nearly zilch. Downsides, not as quick to respond, might use more energy, but given the cost and the relative unimportance of airspeed as it input, it might qualify as a reasonable DIY alternative.
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