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Comment Re:"Open == Secure"? (Score 1) 214

Closed source, commercial software is written by people who are paid to do it. Software that people are paid to written more often includes the boring, not-fun parts like testing, documentation, and auditing. Therefore closed source software has a higher chance of being audited.

Why do you think a car company would not audit open source software it is using in their cars? They can get publicly ridiculed for low quality of their code. Would you buy a car from a company which was shown to have crappy and insecure code in their cars? This is not like a PC which you can reboot and all is fine. And why do you think a company which does not audit its open source code would audit its closed source code?

We're both just constructing arguments that may or may not be true. My point is that those arguments are irrelevant. A given piece of software either has or has not been audited.

I agree with you. My point is that in the case of a car software the openness of the source code would give the company even more incentives to audit it yourself compared to a closed source code. And moreover there are people who are really interested in cars and which would definitely look at the code. What about all the rodhoders?

I mean you want to move experience from simple PC software to car software. I do not think this is valid.

Comment Re:"Open == Secure"? (Score 1) 214

They're both wrong.

Open == You can audit it if you want. It's absolutely no guarantee that anyone ever has.

There may not be a guarantee but there is a good change it is statistically true. There exists a group of people who may want to audit a car software and they can do it only when it is open. Therefore open source software should have a higher chance of being audited.

Comment Re:Given the hype around 3D printing ... (Score 2) 101

I just don't find enough uses for it to justify the floor or bench space for the machine. In subtractive manufacturing where one takes away material I can work in metal, plastic, and wood. I can cut, plane, sand, shave, drill, tap, or die-cut, and if I pick up one of those tabletop mills, I could mill and otherwise create channels, and these can all be done in three different materials.

The problem is that a cheap 3dPrinter can do shapes which would require 5-DOF CNC. These are very expensive. So you can use only plastic in a 3d printer but you can do very complicated shapes. With a cheaper 3 DOF CNC you can use also wood or metals, but the shapes you can produce will be simpler.

Comment Re:Wow! (Score 1) 99

Don't forget it isn't just raw watt savings. You also have the heat dissipation of that heat, and then the additional AC load and it's inefficiency. I'd multiply power savings by 3-4 if you want an accurate figure for amount saved.

Fans running at a bit higher RPM does not increase energy consumption in a noticeable way. A typical PC fan power consumption is about 2W. If you are water cooling without fans then there will not be any difference at all.

If you need air-condition at all then you must realize that these systems have COP of about 4. That means that increasing heat dissipation of your computer by X watts will lead to increase of air-condition consumption by about X/4. That means that your power multiplier of 3-4 is very wrong. If you really want to apply it at all (notice that in during winter you save on heating) then it should be somewhere around 1.25 - 1.3. That does not make a significant difference.

Comment Re:Wow! (Score 1) 99

I was considering upgrades because of power savings many times and I always did a computation how long it would take so that the saved energy pays for the upgrade. Mostly the result was about 9 years. It was always bigger than 4 years. In other words it does not make sense to upgrade because of power savings. I guess only Germans (where energy is ridiculously expensive for home users) may consider upgrade because of power savings :)

Comment a lot of small things (Score 1) 266

cases (avr-dragon, beaglebone)

replacement parts (e.g. knobs for scope, handle for a valve, dust cover for a bicycle pedal ...)

coil spools

holder type things (e.g. PSU holder, HDD holder, CPU water cooler holder, ...)

toys for kids (e.g. a planetary gear assembly to teach them how it works)

improvement parts for the 3d printer itself

prototyping stuff (e.g. usable ergonomic contoured keyboard case)

Comment Re:CPU (Score 1) 107

A lot of controllers require a crystal if you want to use them only as a low or at most full speed USB device.

Did you want to tell that people should not try to build something which would be able to do a low speed USB connection?

But it is true there are controllers which do not need a crystal for USB.

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