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rPi 400

[last updated: 2022-09-26]
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Raspberry pi 400 Hardware pinout
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On this page:

  • Specs
  • Software Install/Startup
  • Operation
  • Dual Monitor
  • Software setup
  • Links

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  • Specs:
      Broadcom BCM2711 quad-core Cortex-A72 (ARM v8) 64-bit SoC @ 1.8GHz
      4GB LPDDR4-3200
      Dual-band (2.4GHz and 5.0GHz) IEEE 802.11b/g/n/ac wireless LAN
      Bluetooth 5.0, BLE
      Gigabit Ethernet
      2 × USB 3.0 and 1 × USB 2.0 ports
      Horizontal 40-pin GPIO header
      2 × micro HDMI ports (supports up to 4Kp60)
      H.265 (4Kp60 decode); H.264 (1080p60 decode, 1080p30 encode); OpenGL ES 3.0 graphics
      MicroSD card slot for operating system and data storage
      78- or 79-key compact keyboard (depending on regional variant)
      5V DC via USB connector
      Operating temperature: 0°C to +50°C ambient
      Maximum dimensions 286 mm × 122 mm × 23 mm

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  • Software Startup:
    • Purchased from canakit, unit only, plus 64gb micro SD,
      which however does not appear to have NOOBS installed.
    • From raspberrypi.org - Software:
      Download imager: imager_1.4_amd64.deb downloaded.
        Did not do this, but instructions say:
        "Put the SD card you'll use with your Raspberry Pi into an SD card reader
        and run Raspberry Pi Imager.
        To install on Raspberry Pi OS, type
        $ sudo apt install rpi-imager
        in a Terminal window.
    • What I did (but which turned out to be unnecessary/redundant - see below)
      Moved the .deb file into .../Tech/microcontrollers/rPi
      Double-click it
      imager window opens with message: "requires installation of 24 packages"
      Clicked "Install Package"
      Select Install, Continue
      Enter password, (default "raspberry") click Authenticate
      Message says: "same version is already installed"
      Close imager window.

    • Mint Menu, type imager in search box
      Click Imager with Raspberry Pi icon
    • Click Choose OS
      Select Raspberry Pi OS (32 bit) - recommended
    • Click Choose SD card
      Select Internal SD card reader
    • Click Write
      Message: All existing data will be erased. Continue?
      Click Yes, enter password
      Writing and Verifying took about 15 minutes
      Message said Ok to remove SD card from reader

    • Inserted into 400, powered up (on/off switch in-line in power cable), booted,
      followed prompts to set keyboard, timezone, etc.
      All successful, Buster booted

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  • Operation:
    • Hardware Connections:
      • connect power (2a recommended) to USB-C port
      • Connect mouse to USB-A port
      • Connect HDMI monitor to left-hand (farthest from SD card) micro-HDMI port

    • [as of 2021-02-28]
      user: pi
      password: raspberry

    • Desktop Preferences not saved:
      • Position cursor on desktop, right click

        select Desktop Preferences
        Defaults > MEDIUM SCREEN > Set Defaults
        select Menu Bar > bottom
        OK

      • However changes are restored to defaults with reboot
      • forums suggest permissions are wrong on the file:
        ~/.config/ ...
        However I do not have that file.
        The only file in ... is ...

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    • Dual Monitor:
      • There are two micro-HDMI ports on the rPi-400
        The one on the "left" (closest to the USB-C power plug), is the main one.
        If you only have one HDMI monitor, it must be plugged into the left port.
      • Menu > Preferences > Screen Configuration
        will bring up a small dialogue box showing "HDMI-1

      • However it didn't work at first:
          But this worked:
          from: https://support.thepihut.com/hc/en-us/articles/360015638017-Raspberry-Pi...
            Force Dual-screen mode - A little tweak of the Raspberry Pi's configuration can help to 'force' the second display to work. Taken from a discussion on the Raspberry Pi forum, try the following fix:

            Open a new terminal window and edit the config file by using the following command:
            sudo nano /boot/config.txt
            Now and add the following lines to the file:
            hdmi_edid_file:1=1
            hdmi_edid_filename:1=edid.dat
            hdmi_force_hotplug:1=1
            Save the file by pressing Ctrl+X then selecting 'Y' to save

    • Software setup:
      • load GUIZero
      • load Arduino ?

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  • Links:

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