For a bunch of software that some people use, life is just easier on Linux. Applications like Gimp, Libreoffice etc tend to work better. Last time I tried GIMP on mac os x you had to click everything twice, once to focus the window and again to actually click something (maybe fixed now). Sometimes there are up to date no Mac builds of a project because none of the developers use mac, and none of the users with macs know how to compile it. Installing things can be a big pain compared to having a good package manager.
Berkeley Earth study took look at the urban heat island effect, and found while its is a real effect, it is localised and not effecting the global averages. https://en.wikipedia.org/wiki/...
"set -o nounset" at the top of your bash script. Then bash acts a bit more like a real programming language, and gives an error if a variable is not set. More tips (and by 'tip' i mean pretty much essential knowledge) at http://www.davidpashley.com/ar...
This is why you should have set -o nounset set -o errexit at the top of every bash script. Also no one should be allowed to write a bash script unless they have read http://www.davidpashley.com/ar...
For some rough numbers, at 5V a raspberrypi A+ takes 500mA plus 250mA for the camera ( http://www.raspberrypi.org/hel... ). Maplin sell a 5V 10Ah portable battery pack (for charging phones and tablets) which weighs 330g ( http://www.maplin.co.uk/p/mapl... ). So off the shelf hardware gives you a 13 hour battery life.
I assume if energy efficency is your goal you could do a bit better.
Shotwell https://wiki.gnome.org/Apps/Sh... is very nice for browsing/tagging. I just wish it had a more advanced raw editing mode like RawTherapee or Darktable.
RawTherapee is great for editing the raw files, but I wish it had a better browser to photos. My perfect software would probably have shotwell as the browser/tagger and RawTherapee as the editor.
Actually yes, assuming you have a phone (or similar) with GPS.
There are a couple of projects collecting locations of cell phone towers and wifi hotspots to allow geolocation to devices without GPS and faster geolocation for with GPS. Having opensource databases means you can do lookup without having to report your location to a google/apple/nokia and means you can do offline look ups. See https://location.services.mozi... or http://wiki.opencellid.org/wik... or http://openbmap.org/
If you are cycling on cycle paths, then you could record GPS traces and upload them to openstreet map. That will require a bit of time on the computer, but the valuable work is the actual recording.
I live and work in a big city, so I cycle and use public transport for about 98% of my journeys. The remaining few percent I take a taxi, which is expensive but rare enough that its not an issue. If it were 5% journeys that I could not do by bike/bus/train then I would probably have to get a car, in which case probably 90% of my journeys would be by private car.
So if you make taxis cheaper, then maybe there are a lot of people who would no longer need a car for those occasional journeys where public transport or bike is not a good option. They can then use public transport most of the time, and taxis occasionally. In cities a bus is always going to be the cheapest (unless the price of fuel and labour drops to zero)
Because quantities do matter. 8 Bq/Tonne is tiny. If you drank this water for a year (3 litre per day), and your body somehow managed to store every Caesium atom, then that would be less radiation than 1 banana and less than 1% the radiation that is in your body naturally.
All this article shows is that radiation is easy to detect, even in tiny quantities, and gamma ray spectroscopy lets you identify the isotope, which in some cases means you can trace the origin.
The "no safe level" meme is mad. Its like saying that because if car hits you at 50 mhp you have a 50% chance of dying, so if it hits you at 1mph you have a 1% chance of dying (linear no threshold), even a 1 in a million chance of dying is dangerous, so even cars travelling at the speed of continental drift are dangerous.
There are more different units for distance. Actually its all the units for brightness that confuse me the most.
There are actually really only 2 physical units, Activity, i.e. decays per second, Becquerel Absorbed does, i.e. joule per kg, Greys and a bonus biologically adjusted Equivalent dose, like Greys adjusted by biological harm, Sievert
They probably will at some point, but for now plenty of CPU and RAM for many tasks. There are plenty of other boards based around faster CPUs armv7 or x86 if that's what you need.
I had a beagleboard http://beagleboard.org/beagleb... , $125, though about £120 GBP to order in the UK. So switching to the pi gave me something smaller, cheaper, more reliable (I had various issues with the USB on the BB), with ethernet and accessible GPIOs.
Beaglebone Black is quite nice, and closer in price to Pi, but I have not personally made any projects where it would be an advantage over a Pi. I for the Pi that I use as a desktop (mostly with just a bunch of terminals SSHed to big machines), it might be a bit faster, but I'd need to add a USB hub to connect a mouse and keyboard.
Many tasks, http://hackaday.com/tag/raspbe... http://makezine.com/category/e... Seems to me like thousands of people are finding interesting things to do. Of course it is not fast enough for everything, but nor is my i7 laptop, or the 48core server box I use at work.
Small. Ok, that's relative. Its been fine for my uses, smaller than the beagleboard and mini-itx boards I used before. The A+ is even smaller. Interested to know what project you are doing where the pi is too big and too slow, what do you use instead?
Cheap. sorry if $25/$35 is too expensive. Its a quarter the price of the beaglebaord that I used before. Maybe you can find something cheaper for your specific task.
Widely available. In the UK there are several high street shops with it in stock, and lots of online retailers.
Documentation. Personally GPU docs don't interest me (though they are now released, so its the most open arm SoC). When I have wanted to use the pi in a project I have found lots of documentation and tutorials to help me.
Well supported. 2.5 years after release they are still doing regular software updates, including big things like wayland support. Compared to lots of hardware that is released with some old distro image that never gets any updates.
So yes the raspberrypi is awesome. It lets lots of people do interesting things at a good price. Sure for certain things an atmega, beaglebaord, banana pi, gumstix, galileo, an old pc or something else might be better.
Interesting board if you don't need all the features and performance of the pi. Though it says "Since this is early stage of development, no documentation is available".
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For a bunch of software that some people use, life is just easier on Linux. Applications like Gimp, Libreoffice etc tend to work better. Last time I tried GIMP on mac os x you had to click everything twice, once to focus the window and again to actually click something (maybe fixed now). Sometimes there are up to date no Mac builds of a project because none of the developers use mac, and none of the users with macs know how to compile it. Installing things can be a big pain compared to having a good package manager.
Berkeley Earth study took look at the urban heat island effect, and found while its is a real effect, it is localised and not effecting the global averages.
https://en.wikipedia.org/wiki/...
And yet some people still cling on to shell scripts for their boot system.
"set -o nounset" at the top of your bash script. Then bash acts a bit more like a real programming language, and gives an error if a variable is not set. More tips (and by 'tip' i mean pretty much essential knowledge) at http://www.davidpashley.com/ar...
This is why you should have
set -o nounset
set -o errexit
at the top of every bash script. Also no one should be allowed to write a bash script unless they have read http://www.davidpashley.com/ar...
For some rough numbers, at 5V a raspberrypi A+ takes 500mA plus 250mA for the camera ( http://www.raspberrypi.org/hel... ). Maplin sell a 5V 10Ah portable battery pack (for charging phones and tablets) which weighs 330g ( http://www.maplin.co.uk/p/mapl... ). So off the shelf hardware gives you a 13 hour battery life.
I assume if energy efficency is your goal you could do a bit better.
I assume that meant the boat was undamaged, not the rocket.
The Neo900 looks even more attractive.
Shotwell https://wiki.gnome.org/Apps/Sh... is very nice for browsing/tagging. I just wish it had a more advanced raw editing mode like RawTherapee or Darktable.
RawTherapee is great for editing the raw files, but I wish it had a better browser to photos. My perfect software would probably have shotwell as the browser/tagger and RawTherapee as the editor.
I was pleased to see that Matplotlib switch to Grace Hopper as their test image. http://matplotlib.org/examples...
Actually yes, assuming you have a phone (or similar) with GPS.
There are a couple of projects collecting locations of cell phone towers and wifi hotspots to allow geolocation to devices without GPS and faster geolocation for with GPS. Having opensource databases means you can do lookup without having to report your location to a google/apple/nokia and means you can do offline look ups. See https://location.services.mozi... or http://wiki.opencellid.org/wik... or http://openbmap.org/
If you are cycling on cycle paths, then you could record GPS traces and upload them to openstreet map. That will require a bit of time on the computer, but the valuable work is the actual recording.
e.g. Pluma which is a continuation of gedit 2.x maintained by the MATE project.
Eizo have been making lots of interesting monitors including 1x1 for a long time, eg
http://www.eizoglobal.com/prod...
http://www.eizoglobal.com/prod...
just prefix the search with !g for google, https://duck.co/help/features/...
I live and work in a big city, so I cycle and use public transport for about 98% of my journeys. The remaining few percent I take a taxi, which is expensive but rare enough that its not an issue. If it were 5% journeys that I could not do by bike/bus/train then I would probably have to get a car, in which case probably 90% of my journeys would be by private car.
So if you make taxis cheaper, then maybe there are a lot of people who would no longer need a car for those occasional journeys where public transport or bike is not a good option. They can then use public transport most of the time, and taxis occasionally. In cities a bus is always going to be the cheapest (unless the price of fuel and labour drops to zero)
Because quantities do matter. 8 Bq/Tonne is tiny. If you drank this water for a year (3 litre per day), and your body somehow managed to store every Caesium atom, then that would be less radiation than 1 banana and less than 1% the radiation that is in your body naturally.
All this article shows is that radiation is easy to detect, even in tiny quantities, and gamma ray spectroscopy lets you identify the isotope, which in some cases means you can trace the origin.
The "no safe level" meme is mad. Its like saying that because if car hits you at 50 mhp you have a 50% chance of dying, so if it hits you at 1mph you have a 1% chance of dying (linear no threshold), even a 1 in a million chance of dying is dangerous, so even cars travelling at the speed of continental drift are dangerous.
There are more different units for distance. Actually its all the units for brightness that confuse me the most.
There are actually really only 2 physical units,
Activity, i.e. decays per second, Becquerel
Absorbed does, i.e. joule per kg, Greys
and a bonus biologically adjusted
Equivalent dose, like Greys adjusted by biological harm, Sievert
The others are obsolete (only used in USA).
So 2 tonnes of water has the same amount of radiation as 1 banana.
https://en.wikipedia.org/wiki/...
Nintendo Wii has a 729 MHz CPU and 88 MB of RAM https://en.wikipedia.org/wiki/... (not that you can directly compare CPUs by clock speed).
They probably will at some point, but for now plenty of CPU and RAM for many tasks. There are plenty of other boards based around faster CPUs armv7 or x86 if that's what you need.
I had a beagleboard http://beagleboard.org/beagleb... , $125, though about £120 GBP to order in the UK. So switching to the pi gave me something smaller, cheaper, more reliable (I had various issues with the USB on the BB), with ethernet and accessible GPIOs.
Beaglebone Black is quite nice, and closer in price to Pi, but I have not personally made any projects where it would be an advantage over a Pi. I for the Pi that I use as a desktop (mostly with just a bunch of terminals SSHed to big machines), it might be a bit faster, but I'd need to add a USB hub to connect a mouse and keyboard.
They released the docs http://www.raspberrypi.org/a-b...
You can run several non-linux OSs on it RISC OS, FreeBSD, NetBSD, Plan 9. Or you could write your own http://www.cl.cam.ac.uk/projec...
Many tasks,
http://hackaday.com/tag/raspbe...
http://makezine.com/category/e...
Seems to me like thousands of people are finding interesting things to do. Of course it is not fast enough for everything, but nor is my i7 laptop, or the 48core server box I use at work.
Small. Ok, that's relative. Its been fine for my uses, smaller than the beagleboard and mini-itx boards I used before. The A+ is even smaller. Interested to know what project you are doing where the pi is too big and too slow, what do you use instead?
Cheap. sorry if $25/$35 is too expensive. Its a quarter the price of the beaglebaord that I used before. Maybe you can find something cheaper for your specific task.
Widely available. In the UK there are several high street shops with it in stock, and lots of online retailers.
Documentation. Personally GPU docs don't interest me (though they are now released, so its the most open arm SoC). When I have wanted to use the pi in a project I have found lots of documentation and tutorials to help me.
Well supported. 2.5 years after release they are still doing regular software updates, including big things like wayland support. Compared to lots of hardware that is released with some old distro image that never gets any updates.
So yes the raspberrypi is awesome. It lets lots of people do interesting things at a good price. Sure for certain things an atmega, beaglebaord, banana pi, gumstix, galileo, an old pc or something else might be better.
Interesting board if you don't need all the features and performance of the pi. Though it says "Since this is early stage of development, no documentation is available".