> A classromm with computers already why get out wall warts (which at > least one kid will trouser as he could do with one or thjinks it will be > cool). > > A classroom with other computers already there teacher does not have > to hand out an extra thing.If the classroom already has computers, you don't need to get the Raspberry Pi at all. Just let the kids use the regular computers.
OLinuXino, a serious Rasberry Pi competitor?
Started by ●March 7, 2012
Reply by ●March 9, 20122012-03-09
Reply by ●March 9, 20122012-03-09
In article <4f59a5a8$0$6882$e4fe514c@news2.news.xs4all.nl>, usenet+5@c- scape.nl says...> > > A classromm with computers already why get out wall warts (which at > > least one kid will trouser as he could do with one or thjinks it will be > > cool). > > > > A classroom with other computers already there teacher does not have > > to hand out an extra thing. > > If the classroom already has computers, you don't need to get the > Raspberry Pi at all. Just let the kids use the regular computers.Yes you do as IT services will not allow loading of packet sniffers practicals with network addressing, subnets and a myriad of other things done to those systems. Bad enough finding accessible places from classrooms for ftp, telnet even ping practicals. Most people have no idea what is taught in classrooms -- Paul Carpenter | paul@pcserviceselectronics.co.uk <http://www.pcserviceselectronics.co.uk/> PC Services <http://www.pcserviceselectronics.co.uk/fonts/> Timing Diagram Font <http://www.gnuh8.org.uk/> GNU H8 - compiler & Renesas H8/H8S/H8 Tiny <http://www.badweb.org.uk/> For those web sites you hate
Reply by ●March 9, 20122012-03-09
In article <4f597914$1@dnews.tpgi.com.au>, keith@nowhere.com.au says...> > On 9/03/2012 8:54 AM, Paul wrote: > > In article<4f59230c$1@dnews.tpgi.com.au>, keith@nowhere.com.au says... > >> > >> On 9/03/2012 3:00 AM, Paul wrote: > >>> In article<9rqf87FadnU1@mid.individual.net>, 5V@2.5A says... > >>>> > >>>> On 08-Mar-12 11:51 AM, Nico Coesel wrote: > >>>>> Don McKenzie<5V@2.5A> wrote: > >>>>> > >>>>>> On 08-Mar-12 10:23 AM, Paul wrote: > >>>>>> > >>>>>>> Hopefully also unlike rPI have mounting holes and a decent power > >>>>>>> connector. > >>>>>> > >>>>>> http://www.olimex.com/about.html > >>>>>> > >>>>>> The company has over 20 years? experience in designing, prototyping and > >>>>>> manufacturing printed circuit boards, sub-assemblies, and complete > >>>>>> electronic products. > >>>>>> > >>>>>> I doubt very much if you will see any of these problems Paul. :-) > >>>>> > >>>>> You never know. I've worked with designers with 20+ years of > >>>>> experience who totally forget about mounting holes, forget about > >>>>> clearance around screw heads or move holes on the next batch while > >>>>> there are 100's of cases in stock with holes that match the 'old' > >>>>> version. Did I already mention small 2mm / 78mil mounting holes? If it > >>>>> where one project you might call it a mistake. On almost every project > >>>>> its a real nuisance. > >>>> > >>>> I just had a look at the RPi videos, and they seem to have mounting > >>>> holes and a DC power input plug. > >>>> > >>>> So I wonder what Paul was referring to. > >>>> > >>>> Cheers Don... > >>>> > >>>> ================ > >>> > >>> All the pictures and user guide show NO mounting holes and was discussed > >>> early in rPI thread. Without ability to mount on or in something for > >>> education it will be a nightmare. Let alone more will be "lost" or > >>> is sometimes known as "trousered". > >>> > >>> Power is by MicroB USB connector, and takes 700mA according to User > >>> Guide. So I see a lot of problems with crappy cables being used to power > >>> it and PCs complaining about over current. > >>> > >> Why would you want to power it from a PC? A wall wart would be a much > >> better idea, it is a standalone system after all it doesn't need a PC > >> connection to program it like an Arduino. > > > > Firstly it is suggested by them to use an MP3/camera/phone USB to microB > > cable in the user guide. > > > > Secondly the base price does not include a wall wart. I don't think it > > even includes a USB cable either. > > A wall wart with included micro USB connector costs less that 10 bucks. > That is if you don't have one already, virtually every smartphone other > than Apple's products use them as a charger. > > > Thirdly because that is what people WILL be doing > > What makes you think that? It makes no sense to do so > > > A classromm with computers already why get out wall warts (which at > > least one kid will trouser as he could do with one or thjinks it will be > > cool). > > Not if they have a bunch at home already > > > A classroom with other computers already there teacher does not have > > to hand out an extra thing. > > You don't hand them out, they are set up in the computer lab already > along with the screen, mouse and keyboard. > > > People at home forget to get a wall wart or take board to show someone > > else or nerdy kid takes with him to 'play' with elsewhere and forgets > > wall wart. > > USB wall warts are ubiquitous. > > > Someone travelling between countries and different shaped holes in walls > > so wall wart does not work. > > Most USB wall warts are of the universal voltage type, you just buy a > cheap adaptor. I even have one that came with slip in connectors that > cover 90% of the power sockets in use in the world.Reality is especially in classrooms budgets are tight so 20 to 30 of these is not prctical causes problems of time wasted, making sure all bits are together at beginning and returned at end of class, let alone whose got a dodgy one to debug. How many wall warts and the USB cables are speced for 5V @ 700mA. You are comparing your situation to be the same as everybody else. -- Paul Carpenter | paul@pcserviceselectronics.co.uk <http://www.pcserviceselectronics.co.uk/> PC Services <http://www.pcserviceselectronics.co.uk/fonts/> Timing Diagram Font <http://www.gnuh8.org.uk/> GNU H8 - compiler & Renesas H8/H8S/H8 Tiny <http://www.badweb.org.uk/> For those web sites you hate
Reply by ●March 9, 20122012-03-09
On 9/03/2012 8:39 PM, Paul wrote:> In article<4f597914$1@dnews.tpgi.com.au>, keith@nowhere.com.au says... >> >> On 9/03/2012 8:54 AM, Paul wrote: >>> In article<4f59230c$1@dnews.tpgi.com.au>, keith@nowhere.com.au says... >>>> >>>> On 9/03/2012 3:00 AM, Paul wrote: >>>>> In article<9rqf87FadnU1@mid.individual.net>, 5V@2.5A says... >>>>>> >>>>>> On 08-Mar-12 11:51 AM, Nico Coesel wrote: >>>>>>> Don McKenzie<5V@2.5A> wrote: >>>>>>> >>>>>>>> On 08-Mar-12 10:23 AM, Paul wrote: >>>>>>>> >>>>>>>>> Hopefully also unlike rPI have mounting holes and a decent power >>>>>>>>> connector. >>>>>>>> >>>>>>>> http://www.olimex.com/about.html >>>>>>>> >>>>>>>> The company has over 20 years? experience in designing, prototyping and >>>>>>>> manufacturing printed circuit boards, sub-assemblies, and complete >>>>>>>> electronic products. >>>>>>>> >>>>>>>> I doubt very much if you will see any of these problems Paul. :-) >>>>>>> >>>>>>> You never know. I've worked with designers with 20+ years of >>>>>>> experience who totally forget about mounting holes, forget about >>>>>>> clearance around screw heads or move holes on the next batch while >>>>>>> there are 100's of cases in stock with holes that match the 'old' >>>>>>> version. Did I already mention small 2mm / 78mil mounting holes? If it >>>>>>> where one project you might call it a mistake. On almost every project >>>>>>> its a real nuisance. >>>>>> >>>>>> I just had a look at the RPi videos, and they seem to have mounting >>>>>> holes and a DC power input plug. >>>>>> >>>>>> So I wonder what Paul was referring to. >>>>>> >>>>>> Cheers Don... >>>>>> >>>>>> ================ >>>>> >>>>> All the pictures and user guide show NO mounting holes and was discussed >>>>> early in rPI thread. Without ability to mount on or in something for >>>>> education it will be a nightmare. Let alone more will be "lost" or >>>>> is sometimes known as "trousered". >>>>> >>>>> Power is by MicroB USB connector, and takes 700mA according to User >>>>> Guide. So I see a lot of problems with crappy cables being used to power >>>>> it and PCs complaining about over current. >>>>> >>>> Why would you want to power it from a PC? A wall wart would be a much >>>> better idea, it is a standalone system after all it doesn't need a PC >>>> connection to program it like an Arduino. >>> >>> Firstly it is suggested by them to use an MP3/camera/phone USB to microB >>> cable in the user guide. >>> >>> Secondly the base price does not include a wall wart. I don't think it >>> even includes a USB cable either. >> >> A wall wart with included micro USB connector costs less that 10 bucks. >> That is if you don't have one already, virtually every smartphone other >> than Apple's products use them as a charger. >> >>> Thirdly because that is what people WILL be doing >> >> What makes you think that? It makes no sense to do so >> >>> A classromm with computers already why get out wall warts (which at >>> least one kid will trouser as he could do with one or thjinks it will be >>> cool). >> >> Not if they have a bunch at home already >> >>> A classroom with other computers already there teacher does not have >>> to hand out an extra thing. >> >> You don't hand them out, they are set up in the computer lab already >> along with the screen, mouse and keyboard. >> >>> People at home forget to get a wall wart or take board to show someone >>> else or nerdy kid takes with him to 'play' with elsewhere and forgets >>> wall wart. >> >> USB wall warts are ubiquitous. >> >>> Someone travelling between countries and different shaped holes in walls >>> so wall wart does not work. >> >> Most USB wall warts are of the universal voltage type, you just buy a >> cheap adaptor. I even have one that came with slip in connectors that >> cover 90% of the power sockets in use in the world. > > Reality is especially in classrooms budgets are tight so 20 to 30 of > these is not prctical causes problems of time wasted, making sure all > bits are together at beginning and returned at end of class, let alone > whose got a dodgy one to debug. > > How many wall warts and the USB cables are speced for 5V @ 700mA. > > You are comparing your situation to be the same as everybody else. >There is nothing special about my situation, it is just the same as most other people.
Reply by ●March 9, 20122012-03-09
On 03/09/2012 10:35 AM, Paul wrote:>>> A classroom with other computers already there teacher does not have >>> to hand out an extra thing. >> >> If the classroom already has computers, you don't need to get the >> Raspberry Pi at all. Just let the kids use the regular computers. > > Yes you do as IT services will not allow loading of packet sniffers > practicals with network addressing, subnets and a myriad of other things > done to those systems. > > Bad enough finding accessible places from classrooms for ftp, telnet > even ping practicals.If the IT dept is concerned about that, they would be equally concerned about Raspberry Pi boards being loaded with packet sniffers and other software. There's no fundamental difference, except that the Pi is smaller, and doesn't come with a case. If you don't want the students to have full access to the computers, just set up a virtual machine for each student. If you're worried about the students messing up the network, configure the host machine as a firewall, or have an external firewall to isolate the entire classroom.
Reply by ●March 9, 20122012-03-09
On a sunny day (Thu, 8 Mar 2012 21:54:33 -0000) it happened Paul <paul@pcserviceselectronics.co.uk> wrote in <MPG.29c33af090e5be4c989707@172.16.0.1>:>Firstly it is suggested by them to use an MP3/camera/phone USB to microB >cable in the user guide. > >Secondly the base price does not include a wall wart. I don't think it >even includes a USB cable either. > >Thirdly because that is what people WILL be doing > >A classromm with computers already why get out wall warts (which at >least one kid will trouser as he could do with one or thjinks it will be >cool). > >A classroom with other computers already there teacher does not have >to hand out an extra thing. > >People at home forget to get a wall wart or take board to show someone >else or nerdy kid takes with him to 'play' with elsewhere and forgets >wall wart. > >Someone travelling between countries and different shaped holes in walls >so wall wart does not work.On top of that it needs 5V *stabilized*. That is a big problem, it should have been 7 to 20 V unstabilized, or 2 to 20V unstabilized, so you could use it in a car or some battery powered system. the extra regulator is expensive. Most new stuff works on 3.3V or some type of Li Ion battery, I made a little 9-20V to +5 V switcher with USB connector to charge a real Chinese mediaplayer I have, that because I have plenty 12V wall warts. Adds an other 5$ at least even if DIY.
Reply by ●March 9, 20122012-03-09
Paul <paul@pcserviceselectronics.co.uk> wrote:>In article <4f597914$1@dnews.tpgi.com.au>, keith@nowhere.com.au says... >> >> On 9/03/2012 8:54 AM, Paul wrote: >> > In article<4f59230c$1@dnews.tpgi.com.au>, keith@nowhere.com.au says... >> >> >> >> On 9/03/2012 3:00 AM, Paul wrote: >> >>> In article<9rqf87FadnU1@mid.individual.net>, 5V@2.5A says... >> >>>> >> >>>> On 08-Mar-12 11:51 AM, Nico Coesel wrote: >> >>>>> Don McKenzie<5V@2.5A> wrote: >> >>>>> >> >>>>>> On 08-Mar-12 10:23 AM, Paul wrote: >> >>>>>> >> >> Most USB wall warts are of the universal voltage type, you just buy a >> cheap adaptor. I even have one that came with slip in connectors that >> cover 90% of the power sockets in use in the world. > >Reality is especially in classrooms budgets are tight so 20 to 30 of >these is not prctical causes problems of time wasted, making sure all >bits are together at beginning and returned at end of class, let alone >whose got a dodgy one to debug.Thats true. I don't think the RP is very suitable for use in a classroom. Its too fragile.>How many wall warts and the USB cables are speced for 5V @ 700mA.How many are not? Most are rated 1A and 2A is on its way. -- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico@nctdevpuntnl (punt=.) --------------------------------------------------------------
Reply by ●March 9, 20122012-03-09
Jan Panteltje <pNaonStpealmtje@yahoo.com> wrote:>On a sunny day (Thu, 8 Mar 2012 21:54:33 -0000) it happened Paul ><paul@pcserviceselectronics.co.uk> wrote in ><MPG.29c33af090e5be4c989707@172.16.0.1>: > >>Firstly it is suggested by them to use an MP3/camera/phone USB to microB >>cable in the user guide. >> >>Secondly the base price does not include a wall wart. I don't think it >>even includes a USB cable either. >> >>Thirdly because that is what people WILL be doing >> >>A classromm with computers already why get out wall warts (which at >>least one kid will trouser as he could do with one or thjinks it will be >>cool). >> >>A classroom with other computers already there teacher does not have >>to hand out an extra thing. >> >>People at home forget to get a wall wart or take board to show someone >>else or nerdy kid takes with him to 'play' with elsewhere and forgets >>wall wart. >> >>Someone travelling between countries and different shaped holes in walls >>so wall wart does not work. > >On top of that it needs 5V *stabilized*. >That is a big problem, it should have been 7 to 20 V unstabilized, >or 2 to 20V unstabilized, >so you could use it in a car or some battery powered system. >the extra regulator is expensive. >Most new stuff works on 3.3V or some type of Li Ion battery, > >I made a little 9-20V to +5 V switcher with USB connector to charge a real Chinese mediaplayer I have, >that because I have plenty 12V wall warts. >Adds an other 5$ at least even if DIY.You know about Dealextreme.com? You probably could have saved some money and clear some space by throwing the 12V wall warts away :-). -- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico@nctdevpuntnl (punt=.) --------------------------------------------------------------
Reply by ●March 9, 20122012-03-09
On a sunny day (Fri, 09 Mar 2012 13:26:09 GMT) it happened nico@puntnl.niks (Nico Coesel) wrote in <4f5a042f.3990283062@news.kpn.nl>:>>I made a little 9-20V to +5 V switcher with USB connector to charge a real Chinese mediaplayer I have, >>that because I have plenty 12V wall warts. >>Adds an other 5$ at least even if DIY. > >You know about Dealextreme.com? You probably could have saved some >money and clear some space by throwing the 12V wall warts away :-).Yes, and I know about ebay too. I payed GBP 8.89 for the Chinese media player, it has a 2.4 inch screen. plays Xvid, mp3, has a FM radio, mp3 player, calendar, stopwatch, camera, microUSB, audio recorder, can record video from that camera, and a build in battery. Quality is excellent. It educational value is fantastic if you play educational videos on it, for example the Feynman lectures. So the 5 $ extra for that switcher did not weight that heavy. Of course it has free shipping from China. If you do some searching on ebay you find a lot of single board computahs too. I never bought one of those, but there was some cool stuff around, like with touch screen and what not. This week I bought some nice 16 GB USB sticks, One HD movie fits on it:-) My Samsung 46 inch LCD plays it, http://www.ebay.com/itm/HOT-Aureate-tornado-key-8GB-16GB-32GB-USB-Memory-Stick-Flash-Pen-Drive-/160751880496?pt=LH_DefaultDomain_0&var=&hash=item256d8f0930 Just bought it for the looks, and because it is actually cheaper than the local shops.
Reply by ●March 9, 20122012-03-09
On 3/8/2012 11:39 PM, Arlet Ottens wrote:>> A classromm with computers already why get out wall warts (which at >> least one kid will trouser as he could do with one or thjinks it will be >> cool). >> >> A classroom with other computers already there teacher does not have >> to hand out an extra thing. > > If the classroom already has computers, you don't need to get the > Raspberry Pi at all. Just let the kids use the regular computers. >I love it that the old guys are telling the new kid what to do. Maybe the RPi has a plan that does not include the legacy path for teaching computers. Getting people to help reduce the cost buy selling to the general public (like OLPC). Why not just wait till the other shoe drops. hamilton
