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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