🚀 go-pugleaf

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.