Exemplary Device: Raspberry PI

 Exemplary Device: Raspberry PI

Introduction of Raspberry Pi

  • ·         A low-cost, credit-card-sized minicomputer.
  • ·         Plugs into a computer monitor or TV.
  • ·         Uses a standard keyboard and mouse.
  • ·         Use for explore computing as for programmings like Scratch and Python languages.
  • ·         Capable as a normal desktop computer to browsing the internet and playing high-definition video, to making spreadsheets, word-processing, and playing games.”
  • ·         Allowing interface sensors and actuators through the general purpose IO pins
  • ·         Supports Python out of box


Structure of board 

 Raspberry Pi board uses various components and peripherals as follows:-

 Processor and Ram

  • Based on an ARM processor.
  • The latest version of Raspberry Pi (model B, revision 2)  comes with a 700 MHz low-power ARM 1176JZ-F processor And a 512 MB SD Ram.

  USB ports

  • Two USB 2.0 USB ports on Raspberry pi can provide a current of up to 100 mA. 
  • For connecting devices that draw a current of more than 100 mA, an external USB-powered hub is required.

  Ethernet port

  • Standard RJ45 Ethernet port. 
  • Connect an ethernet cable or USB Wi-Fi adaptor to provide internet connectivity.

  HDMI outputs

  • The HDMI port on Raspberry Pi provides both video and audio output. 
  • Connect the Raspberry Pi to a monitor by an HDMI cable. 
  • For monitors that have a DVI port but no HDMI port so use an HDMI to DVI  adaptor or cable.

  Composite video output with RCA jack

  •  Support both PAL and NTSC video output.
  •  RCA jack is used to connect old television that has an RCA input only.

  Audio output

  • 3.5 mm audio output jack is used for audio output to old television along with the RCA Jack for video.
  • The audio quality is inferior to the HDMI output.

  GPIO pins

  • A number of general-purpose Input / Output pins are used by Raspberry Pi.
  • There are four types of pins on Raspberry Pi:- True GPIO pins, SPI interface pins,  12C interface pins,  and Serial RX and TX pins.

  Display serial interface( DSI)

  •  Used to connect an LCD panel to Raspberry Pi.

  Camera serial interface( CSI)

  •  Used to connect a camera module to Raspberry Pi.

 Status LEDs

  •  Raspberry Pi has 5 status LED is which are:-
  •  ACT:-  SD card access.
  •  PWR:-  3.3 V power is present.
  •  FDX:- Full duplex LAN connected.
  •  LNK:-  link/  network activity.
  •  100:- 100 Mbit LAN connected.

  SD card slot

  •  Not have a built-in operating system and storage so plug in an SD card loaded with a Linux image to an SD card slot.
  •  Required at least an 8GB SD card for the setting up NOOBS software (new out-of-the-box software)

 Power input

  •  A micro-USB connector for power input. 


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