Overview o he Raspberry Pi Models 3B & 2B session-1A,Overview,Raspberry-Pi.pdf Overview of the Pi 4

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  • Overview of the Raspberry Pi

    Models 3B & 2B (Let's look at the hardware!)

    Rick Commo, K7LOG Max Vaughan, KF7MAX

  • Overview of the Pi

  • Overview of the Pi

  • Overview of the Pi

    ● What's really different between the original 2B and the 3B?

    Parameter Pi 2B (not the V1.2) Pi 3B Architecture Cortex-A7

    (32 bit) Cortex-A53 (64 bit)

    CPU Speed 900MHz 1200MHz RAM Speed 450MHz 900MHz Internal Wi-Fi And Bluetooth

    USB dongles Internal

    ● And how does that affect performance? – Pi 3 is faster than the 2B, anywhere from 10% to 60%.

  • Overview of the Pi

    ● micro-SD cards formats – FAT32

    ● Required for the Raspberry Pi – ExFAT

    ● Windows: FAT32 up to 32GB then ExFAT ● 8GB recommended minimum. ● The size/cost sweet spot is around 16GB. ● Available in speeds of 2MBps thru 90MBps. ● Class 10 / U1 are common and priced well.

    – Consider this a minimum for a good experience!

  • Overview of the Pi

    ● SD & microSD card speeds:

  • Overview of the Pi

    ● The Pi runs on 5V from an external source. – Internally it generates 3.3V and 1.8V for chips.

    ● 5 Vdc – Wall warts @2.5A with micro-USB connector – USB power supply - USB to micro-USB cable – GPIO pins – 5Vdc to pin_2 & Gnd to pin_6

    ● Not preferred, but can be done – be careful! ● 12 Vdc

    – 5V regulator & wire into the micro-USB ● Can wire into the GPIO as above, but not preferred.

  • Overview of the Pi

    ● There are 2 GPIO pins marked 3.3 V. – Don't even think of using these as 3.3 V inputs!

    ● For shack and emergency use – Need around 5W-7W for the Pi itself under heavy

    CPU load plus any additional power for peripherals to the Pi.

    – Consider solar to battery to 5V for uninterrupted use ● Might be a case for wiring to GPIO pins, but solderable

    micro-USB are available.

  • Overview of the Pi

    ● USB Keyboard & Mouse – To save a Pi port, use a cheap USB-2 compatible

    hub. ● PS2 Keyboard & Mouse

    – Use a PS2-Y to USB cable. ● Video

    – HDMI is the default on first boot.. ● Lots of small, inexpensive HDMI displays available.

    – Can be set to composite video connector via software.

    – Display Serial Input (DSI) port

  • Overview of the Pi

    ● 4 USB-2 ports ● There is a single USB-2 port on the CPU chip

    itself. – The user USB ports, and the Ethernet port, all

    connect to the CPU via a USB-2 hub chip. ● USB-2 has a max. throughput of 480Mbps or

    roughly 40+ Mbps. – A lot of that 480Mbps is eaten up with overhead

    managing the numerous ports on a single USB-2 channel.

    – The reality is something like a real 260Mbps of aggregate throughput.

  • Overview of the Pi

    ● 10/100Mbps Ethernet port ● Standard RJ45 connector ● Connects to the CPU via the USB-2 hub chip. ● Support for Ethernet built into the OS. ● Initially set to DHCP, but can be set to a static

    address by editing /etc/dhcpcd.conf. ● Append something like this at to the end of the


  • Overview of the Pi

    ● Native audio connector uses a form of PWM to produce both channels, and there is no audio input.

    ● Much better off using a USB to audio adapter: – A board like the UDRC from NW Digital Radio. – A small USB-audio adapter (provides audio into to the

    Pi as well).

  • Overview of the Pi

    ● WiFi – Built into the Pi 3 (802.11n)

    ● Built-in supported with Compass and Raspbian. – USB dongles for the Pi 2 (802.11b/g/n)

    ● Some dongles supported by OSes, but may need a driver, depending on the dongle.

    ● Bluetooth – HW built into the Pi 3 (Bluetooth 4.1). – USB dongles for the Pi 2 – Compass Linux pre-installs the Bluetooth service.

  • Overview of the Pi

    ● Pi 2 and Pi 3 have the 40 pin GPIO port (J8) – Power/Ground pins: 12 – Digital pins: 28

    ● Some GPIO pins are multi-functional. The function is set when an app initializes the them.

    ● Pins by functional group – GPIO / 17 pins – UART / 2 pins – SPI / 5 pins – I2C / 2 pins – HAT EEPROM I2C / 2 pins

  • Overview of the Pi

    ● GPIO Pin numbering on header.

  • Overview of the Pi

    ● Display Serial Input (DSI) port – Raspberry Pi Foundation

    ● 7” diagonal / 800 x 480 pixel – This is too small for many apps, for example fldigi.

    ● 10 point touch capability. ● Price is typically $80, but can be had cheaper.


  • Overview of the Pi

    ● Camera Serial Input (CSI) port – Supported as part of Raspbian OS. – A number of cameras available.

    ● Ex: Raspberry Pi Foundation Camera Board V2 (Under $30 on Amazon.)

    – 8 MP – Available with and without an IR filter (night vision).

  • Overview of the Pi

    ● With the power supply turned off or unplugged – Insert the microSDHC card into it's slot. – Connect the mouse and keyboard. – Connect the video screen (HDMI assumed). – Connect the Ethernet cable (if hardwiring). – Insert the Micro-USB power plug into the Pi. – Turn on or plug in the power supply.

    ● At this point you should see the Pi booting up on your video screen.

  • Overview of the Pi


  • Overview of the Pi


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