Huy Vu~ sivinnguyen

The goal of this article is to explain how to install one or many Raspberry Pi 3 B+ devices connected with one to four Raspberry Pi Zero 1.3 devices each via USB OTG networking.

Preview

Each device - Pi and Zero - will be connected to the network 192.168.0.0/24. Each Zero will be connected via USB OTG to the Pi. That will establish a network between the two devices. On each Pi a network bridge will be configured to forward the traffic between the Pi ethernet port and the connected USB ports.

Their individual hostname/IP pattern will be:

10.lab | 192.168.0.10 (1st Pi)
20.lab | 192.168.0.20 (2nd Pi)

How to set up PulseAudio over Network

PulseAudio actually has great networking capabilities. Especially when combined with Avahi/Zeroconf it is especially easy to set up, though technically it should also be possible without.

Setting up the server

Open /etc/pulseaudio/default.pa
At the end of the file, add load-module module-native-protocol-tcp auth-ip-acl=127.0.0.1;192.168.254.0/24 auth-anonymous=1 to activate networked audio from 192.168.254.0-255 without needing authentication.
Kill pulseaudio, it should be auto-restarted, or restart your login session to activate the changes. You should now be able to set PULSE_SERVER=192.168.254.XXX and have the remote audio working! If not check the firewall settings, PulseAudio seems to open a random port by default.

Setting up automatic configuration and discovery

On both the server and client, install pulseaudio-module-zeroconf and avahi, then after installing make sure Avahi always runs by running systemctl enable --now avahi-daemon

Install Termux, an Android terminal emulator that provides a Linux execution environment and various tools.
Update system packages in Termux:
```
$ pkg update -y
```

Dactyl & Dactyl Manuform Case Preparation
https://keeb.io/products/amoeba-single-switch-pcbs
https://lewisf.com/dactyl-manuform/ hold ; and use hjkl to left,right, up,down
Both part needs to have ProMicro MicroController so It can use the QMK Firmware for controling the keys on keyboard itself
4x6 is the way to go

There’s a strong trend for ergonomic keyboards to reduce the number of keys, mostly becouse of QMK framework that allows layering. People usually prefer less rows.

WSL install another distro

Here are some default vars for the process

ISO_DIR=~/fedora;
ROOTFS_MOUNT_DIR=/mnt/contents

DISTRO_LOCATION=

Shutdown Raspberry Pi with a Single Button

There are two methods:

Scripted Method
Boot Overlay Method (also below as "tl;dr")

tl;dr Version

Add the following to your /boot/config.txt and reboot:

	# /etc/udev/rules.d/99-pico.rules

	# Make an RP2040 in BOOTSEL mode writable by all users, so you can `picotool`
	# without `sudo`.
	SUBSYSTEM=="usb", ATTRS{idVendor}=="2e8a", ATTRS{idProduct}=="0003", MODE="0666"

	# Symlink an RP2040 running MicroPython from /dev/pico.
	#
	# Then you can `mpr connect $(realpath /dev/pico)`.
	SUBSYSTEM=="tty", ATTRS{idVendor}=="2e8a", ATTRS{idProduct}=="0005", SYMLINK+="pico"

	# script parameters
	param(
	[ValidateSet("Sign", "UntrustCertificates")]
	[string] $Mode = "Sign",

	[string] $InfFile,
	[string] $CommonName = "linux.local",
	[switch] $Force
	)

	# copyright Threadsec Inc
	# This script auto-configure and ssh auto-connect to RPi ZERO Ethernet gadget VID:0x1d6b PID:0x0137
	# This script require admin right to access to adapter conf.
	# https://threadsec.wordpress.com/raspberry-pi-zero-usb-composite-gadget/
	#
	# Edit $user=""
	# Windows 10 : As Admin, run:
	# powershell -ep bypass -file Configure-Ethernet-RNDIS-PiZero-connection.ps1
	#
	Clear-Host

	#!/bin/bash
	# Set up a Raspberry Pi 4 as a USB-C Ethernet Gadget
	# Based on:
	# - https://www.hardill.me.uk/wordpress/2019/11/02/pi4-usb-c-gadget/
	# - https://pastebin.com/VtAusEmf

	if ! $(grep -q dtoverlay=dwc2 /boot/config.txt) ; then
	echo "Add the line dtoverlay=dwc2 to /boot/config.txt"
	exit
	fi