Week 04 – Types of signals and networks

Lesson Overview

• Topic: Types of signals, types of networks, Installation of Raspberry Pi

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Content 1 – Computer Basic – Types of Signals

In the electronic world, there are type types of signals, analog and digital. Let’s find the differences between two signals with the images below.

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Content 2 – Types of network

• Wired
  • Twisted Pair: Reduce noise, cancel interference
  • Coaxial Cable: center conductor and conducting shield
  • Fiber Optic

• Wireless
  • Radio waves
    • AM (Amplitude Modulation)
    • FM (Frequency Modulation)
  • Infrared (IR): TV Remote control
  • Microwave: Satellite (22,300 miles)
  • Wi-Fi: 2.4GHz-5GHz band, a standard for internet
  • Bluetooth: 2.4-2.48 GHz, a standard for the connection protocol
  • Cell communication

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Activity 1 – Setting up Raspberry Pi 3.

• This work should be done on your Windows or Mac computer
• Download a Raspberry Pi image
• https://www.raspberrypi.org/downloads/
• For beginners – NOOBS (New Out Of the Box Software)
• Others – Raspbian

• Format your SD card
  • Caution – This will erase all data stored in the SD card
  • Visit the SD Association’s website and download SD Formatter for Windows or Mac.
  • Insert your SD card into the computer or laptop’s SD card slot.
  • In SD Formatter, select your SD card (VERY CAREFUL), and the format the card.

• Extract NOOBS from the zip archive
  • Find the downloaded archive — by default, it should be in your Downloads folder.
  • Extract the zip file using 7Zip app.
  • Copy the image files into the SD card – share your USB SD card reader with your classmate
  • Insert the SC card into Raspberry Pi and follow the instruction.

• Write the bootloader image into the SD card.
  • Download and install balenaEtcher
  • Build a bootloader as shown in the below image.
    • Select Raspbian Image
    • Select your SD Card Drive
    • Finish

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Activity 2 – Connect to your Raspberry Pi

• Plug the USB cable to your desktop computer USB port and connect it to your Raspberry Pi power port
• You should see a red LED light-up on the Raspberry Pi
• Your monitor will show the below icons

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Activity 3 – Install Raspberry Pi OS ninth the SC card

• Check the box for Raspbian, and then click install
• This process will take a few minutes.

• After a few seconds, the Raspbian Desktop will appear

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Activity 4 – Finish up the setting

• WiFi connection
  • Click the WiFi icon
  • Select “CityTech-WiFi” network
  • Open the web Browser and login the CUNY network using your credential
• Set your Country, Language, and Timezone
  • Open a command window
  • Type “sudo raspi-config”
  • Select “1 Change User Password”
  • Select “Internationalisation Options”
  • Change timezone – America-New York
  • Change Keyboard Layout – Generic 105 key (Intel) PC
  • Select Update
  • Finish

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Activity 5 – Update date and time with the command

• If you face this error while WiFi setting, you need to tell that your system is wrong!
• Use date command
• Open a terminal window -> “man date”

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Activity 6 – Turn on & off Raspberry Pi

• In order to safely turn off your Raspberry Pi, you will need to let your Pi know you are turning it off.
• Turn on – Just plug in the power cable
• Turn off –
• Menu -> Shutdown
• Terminal

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Closing – Exploring Raspberry Pi

• Raspberry Pi is a mini-computer, which has almost identical functions to Windows computers.
• Internet Web Browser – Chromium
• Office Software
• Spreadsheet – LibreOffice Calc
• Presentation – LibreOffice Impress
• Word – LibreOffice Writer
• Game
• Accessories
• Help
• Preferences