Difference between revisions of "Raspberry Pi"

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(added info re fragile capacitor & power supplies)
 
(second release of model B & cases)
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A growing body of information is available at http://www.raspberrypi.org
 
A growing body of information is available at http://www.raspberrypi.org
   
Only a couple of '''critical''' issues, that are easily overlooked, are summarised below
+
Only a few '''critical''' issues, that are easily overlooked, are summarised below
  +
== Models ==
  +
Most will purchase the model B, which has Ethernet and more USB ports
  +
  +
The second release of model B has 512 MB RAM in lieu 256 MB
  +
*likely to increase the variety of OS that are usable
  +
*earlier boards are not upgradeable, because all components are soldered in place
  +
  +
== Case ==
  +
The basic product is sold without a case. It does not fit in any "standard" blank case and has sockets on both sides as well as all four edges, making construction of a suitable case not a simple task.
  +
  +
Cases are now being sold on the Raspberry Pi site. Alternatively, third-party cases are also marketed
  +
 
== Circuit Board ==
 
== Circuit Board ==
 
Power is supplied via the micro-USB connector at one end. The surface-mounted capacitor behind that connector is a known physical weak-point.
 
Power is supplied via the micro-USB connector at one end. The surface-mounted capacitor behind that connector is a known physical weak-point.
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#*1 A available to a single socket
 
#*1 A available to a single socket
   
[[User:Rpeters|Rpeters]]09:23, 8 September 2012 (EST)
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[[User:Rpeters|Rpeters]]14:15, 10 January 2013 (EST)
 
[[Category:Technical Info]]
 
[[Category:Technical Info]]

Revision as of 14:15, 10 January 2013

A growing body of information is available at http://www.raspberrypi.org

Only a few critical issues, that are easily overlooked, are summarised below

Models

Most will purchase the model B, which has Ethernet and more USB ports

The second release of model B has 512 MB RAM in lieu 256 MB

  • likely to increase the variety of OS that are usable
  • earlier boards are not upgradeable, because all components are soldered in place

Case

The basic product is sold without a case. It does not fit in any "standard" blank case and has sockets on both sides as well as all four edges, making construction of a suitable case not a simple task.

Cases are now being sold on the Raspberry Pi site. Alternatively, third-party cases are also marketed

Circuit Board

Power is supplied via the micro-USB connector at one end. The surface-mounted capacitor behind that connector is a known physical weak-point.

  • do not grip the board by that capacitor
  • preferably leave the micro-USB power cable permanently plugged in and power ON?OFF by either
    • powering the plug-pack/USB-hub ON?OFF or
    • disconnecting the other end of the power cable

Power Supply

  1. A raspberry pi draws 0.7A (700 mA) of regulated 5V power, which is beyond the capacity of most:
    • USB sockets on a computer
    • mains-USB plug packs
  2. Suitable power supplies include
    • mains-USB plug packs rated at 1A
      • preferably having a single USB socket only
    • USB-hubs capable to delivering 1 A to a single USB socket
      • "Zipp" brand from Big W does - but check before purchasing
  3. although the use of a USB-hub as a power source is deprecated by the manufacturers, it has been used sucessfully by the developers at http://www.ipfire.org. Critical factors are:
    • regulated power to the hub
    • 1 A available to a single socket

Rpeters14:15, 10 January 2013 (EST)