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Wednesday, 16 October 2013

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Parts of Raspberry Pi






Let’s start with a quick tour of what you’re looking at when you take it out of
the box.

It’s tempting to think of the Raspberry Pi as a microcontroller development
board like Arduino, or as a laptop replacement. In fact it is more like the exposed
innards of a mobile device, with lots of maker-friendly headers for the
various ports and functions

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Refer the figure given below :


  •                                                  A. The Processor. 
                                       At the heart of the Raspberry Pi is the same processor 
                           you would have found in the iPhone 3G and the Kindle 2, so you can think
                          of the capabilities of the Raspberry Pi as comparable to those powerful
                           little devices. This chip is a 32 bit, 700 MHz System on a Chip, which is
                          built on the ARM11 architecture. ARM chips come in a variety of architectures
                          with different cores configured to provide different capabilities
                          at different price points. The Model B has 512MB of RAM and the Model
                          A has 256 MB. (The first batch of Model Bs had only 256MB of RAM.)



  • B. The Secure Digital (SD) Card slot.


 You’ll notice there’s no hard drive on
the Pi; everything is stored on an SD Card. One reason you’ll want some
sort of protective case sooner than later is that the solder joints on the
SD socket may fail if the SD card is accidentally bent.


  • C. The USB port. 


On the Model B there are two USB 2.0 ports, but only one
on the Model A. Some of the early Raspberry Pi boards were limited in
the amount of current that they could provide. Some USB devices can
draw up 500mA. The original Pi board supported 100mA or so, but the
newer revisions are up to the full USB 2.0 spec. One way to check your
board is to see if you have two polyfuses limiting the current (see
Figure 1-2). In any case, it is probably not a good idea to charge your cell
phone with the Pi. You can use a powered external hub if you have a
peripheral that needs more power.










  • D. Ethernet port. 


The model B has a standard RJ45 Ethernet port. The
Model A does not, but can be connected to a wired network by a USB
Ethernet adapter (the port on the Model B is actually an onboard USB
to Ethernet adapter). WiFi connectivity via a USB dongle is another option.


  • E. HDMI connector.


 The HDMI port provides digital video and audio output.
14 different video resolutions are supported, and the HDMI signal can be
converted to DVI (used by many monitors), composite (analog video
signal usually carried over a yellow RCA connector), or SCART (a European
standard for connecting audio-visual equipment) with external
adapters.

  • F. Status LEDs.


 The Pi has five indicator LEDs that provide visual feedback


  1.                           ACT  -  Indicated by Green  - Lights when the SD card is accessed (marked OK                                                                                                                              on earlier boards)
  2.                           PWR  -  Indicated by Red -    Hooked up to 3.3V power
  3.                           FDX -   Indicated by Green  - On if network adapter is full duplex
  4.                           LNK  - Indicated by  Green  - Network activity light
  5.                           100   - Indicated by Yellow-  On if the network connection is 100Mbps (some early                                                                                                             boards have a 10M misprint)

  • G. Analog Audio output. 

                                                    This is a standard 3.5mm mini analog audio jack,
                                      intended to drive high impedance loads (like amplified speakers). Headphones
                                      or unpowered speakers won’t sound very good; in fact, as of this
                                      writing the quality of the analog output is much less than the HDMI audio
                                      output you’d get by connecting to a TV over HDMI. Some of this has to
                                      do with the audio driver software, which is still evolving.

  • H. Composite video out.

                                                  This is a standard RCA-type jack that provides
                                       composite NTSC or PAL video signals. This video format is extremely
                                       low-resolution compared to HDMI. If you have a HDMI television or monitor,
                                       use it rather than a composite television.


  • I. Power input.

                                                   On of the first things you’ll realize is that there is no power
                                         switch on the Pi. This microUSB connector is used to supply power (this
                                          isn’t an additional USB port; it’s only for power). MicroUSB was selected
                                          because the connector is cheap USB power supplies are easy to find.


Other Peripherals which can be connected: 


  1. A Powered USB Hub
  2. Heatsink
  3. Real Time Clock
  4. Camera module
  5. LCD display
  6. WiFi USB dongle
  7. Laptop dock
  8.  Case for protection


                                






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