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GNU/Linux on Raspberry Pi 4/400 and Rtlduino

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Hardware

  • Two Displays & Two Computers

    In my messy office I have a main desk I work at. I have two portait displays on a hefty, but inexpensive BONTEC Dual Monitor Stand (affiliate link), clamped to the back, to lift the monitors up off the desk. The monitors are 3-year-old, low-end 24” ASUS VS248HR (affiliate link) “Gaming Monitor’s”.

    I recently bought a Raspberry Pi 400 which also sits on my desk for quick-release arm64-action! The problem I have had with other Pi’s is the spiders web of cables needed, and additional keyboard. So when the Pi 400 came out, with integral keyboard, and ports all aligned at the back, I snagged one.

    I like not having to unplug/replug cables when switching devices, but rather just grab the machine and start playing. The ASUS monitors only have one HDMI port each, and I like using both monitors. I’d also like to sometimes use two monitors on the Pi. I don’t have room or money for four monitors! So I needed an easy solution.

  • First bootup EasyOS aarch64 on Pi 4

    Having got the packages together and a kernel compiled, I used woofQ to build an SD-card image, EasyOS 0.105.

    Booted it on the Pi, mouse and keyboard dead in the initrd -- well, that is not new, had same thing with the Pi3.

  • WiFi 6 is not faster than Ethernet on the Raspberry Pi

                     

                       

    In this post I'll describe how testing this $20 M.2 WiFi adapter card suggested by Javier Choclin led to me learning a lot about Linux's wireless networking stack.

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  • $6 Rtlduino RTL8720DN dual-band WiFi IoT board features 2.4/5GHz Wireless MCU

    There are plenty of WiFi modules for the IoT market, but those usually work at 2.4 GHz only. This may be an issue in areas where the 2.4 GHz spectrum is overcrowded. But two years ago, we were pleased to see the Ameba Z2  board offering dual-band (2.4GHz and 5Ghz) WiFi thanks to Realtek RTL8720CM wireless MCU, and last year, we discovered B&T BW16 dual-band IoT module based on RTL8720DN sold for under $4 before shipping.

    If you like the cheap price of the module, but do not feel like creating your own baseboard, or soldering wires to the module, you’ll be glad to know Rtlduino RTL8720DN board offers an easy way to evaluate RTL8720DN dual-band WiFi (and Bluetooth LE 5.0) microcontroller as it is fitted with a B&T BW16 module and comes in a form factor similar to NodeMCU ESP8266 board.

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