Devuan Raspberry Pi 2 is ready.
Computer: Raspberry Pi 2 Model B
OS: Devuan 1.0
Modification of 5V/2A power supply
I had a USB to micro USB adaptor and decided to use it instead buying a 5V/2A power supply with micro USB plug.
Find power and ground wires from the power supply cable using a multimeter.
Identifying power adaptor’s voltage polarity
Cut USB and power cable using a wire stripper. 
0.9 mm wire and 4.45 mm USB cable
4 pin USB plug
| 4 2 3 1 | +---------+ 4: Ground 1: VCC (5V+)
micro USB and USB plug pins
Red wire: VCC (5V+)
Black: Ground
Green and white: signal
Shielded four wires in USB cable
Solder the two cable wires.
I used heat shrink tubes for the insulation.
Soldering power supply and USB wires
3D Printing the case
Case files: http://www.thingiverse.com/thing:1279415
Filament: 1.75 mm PLA red (eSun) and yellow (No brand)
Layer height: 0.25 mm
Install and set up Devuan
Installation guide I followed is here.
I spent few hours from start to finish.
I had trouble while preparing a bootable SD card. The SD card reader I have intermittent connection problem, which I should replace it for headache shake.
A weird thing is that only long USB cable off of Wacom table makes the card reader being plugged in Devuan.
Each time after I wrote the image file to microSD card, the card reader went dead.
$ sudo dd bs=4M if=raspbian-ua-netinst-v1.0.7.img of=/dev/sdb
gparted couldn’t format the microSD card so I had to work on a Windows laptop for formatting and creating the installation microSD card. I need to learn how to format a dd-ed SD card.
In second trial, the board was working. I could see IP address of the board on router’s admin page and “nmap -sn 192.168.1.0/24” command.
Upgrade from Wheezy to Devuan
I could login in Raspberry Pi Wheezy using ssh.
Login ID/Passwd: root/raspbian
The whole upgrade had done in two ssh terminals.
# dpkg-reconfigure locales en_US.UTF-8 ko.KR.EUC-KR ko.KR.UTF-8 # dpkg-reconfigure tzdata Update /etc/apt/sources.list # wget http://packages.devuan.org/devuan/pool/main/d/devuan-baseconf/devuan-baseconf_0.6.4%2Bdevuan3_all.deb $ dpkg -i devuan-baseconf_0.6.4+devuan3_all.deb Create 01lean file /etc/apt/apt.conf.d# more 01lean APT::Install-Suggests "0"; APT::Install-Recommends "0"; APT::AutoRemove::SuggestsImportant "false"; APT::AutoRemove::RecommendsImportant "false"; # gpg --recv-keys 94532124541922FB # gpg --export -a 94532124541922FB | apt-key add - # apt-get update && apt-get upgrade && apt-get dist-upgrade # apt-get install -y aptitude # aptitude search '?installed' | grep systemd # apt-get install task-lxde-desktop xrdp # aptitude search '?installed' | grep systemd # apt-get install sudo Created a user named penguin. VNC setup # apt-get install vnc4server penguin@pi:~$ vncserver  -geometry 1024x728 -alwaysshared -depth 24 You will require a password to access your desktops. Password: Verify: xauth: file /home/penguin/.Xauthority does not exist New 'pi:3 (penguin)' desktop is pi:3 Creating default startup script /home/penguin/.vnc/xstartup Starting applications specified in /home/penguin/.vnc/xstartup Log file is /home/penguin/.vnc/pi:3.log VNC client in the remot host $ sudo aptitude install xvnc4viewer $ xvnc4viewer 192.168.1.103:3 VNC Viewer Free Edition 4.1.1 for X - built Apr 2 2015 21:51:06 Copyright (C) 2002-2005 RealVNC Ltd. See http://www.realvnc.com for information on VNC. Fri Aug 19 00:57:48 2016 CConn: connected to host 192.168.1.103 port 5903 CConnection: Server supports RFB protocol version 3.8 CConnection: Using RFB protocol version 3.8 Password: Fri Aug 19 00:57:56 2016 TXImage: Using default colormap and visual, TrueColor, depth 24. CConn: Using pixel format depth 6 (8bpp) rgb222 CConn: Using ZRLE encoding CConn: Throughput 15714 kbit/s - changing to hextile encoding CConn: Throughput 15714 kbit/s - changing to full colour CConn: Using pixel format depth 24 (32bpp) little-endian rgb888 CConn: Using hextile encoding Install hibernation program $ sudo aptitude install pm-utils
Install Printrun for 3D Printer server
Install dependent packages
$ sudo apt-get install python-serial python-wxgtk3.0 python-pyglet python-numpy cython python-libxml2 python-gobject python-dbus python-psutil python-cairosvg git
Clone the repository
git clone https://github.com/kliment/Printrun.git
Build Cython-based G-Code parser
Go to Printrun directory and execute below command.
$ python setup.py build_ext –inplace
Remote 3D Printing on Raspberry Pi 2 server
It requires simple two steps.
First, upload a gcode file to the server. I use scp.
$ scp idler-bracket-v2.gcode pi@raspberrypi:3D-Printing/gcode-files
Second, ssh login to the server.
$ ssh -X pi@raspberrypi
Running Pronterface that provides GUI
Go to Printrun directory and start pronterface.py
pronterface
Running Pronsole that provides simple text UI Go to the directory that stores gcode-file and start pronsole.py.
pronsole
Configure 250000 baud rate in USB connection
Open Configuration.h of Mariln firmware in Arduino IDE and change the baud rate constant to 250000.
#define BAUDRATE 250000 // (115200)
Upload the firmware.
You need to install latest pyserial from source code.
Download the source of pyserial https://github.com/pyserial/pyserial.
Decompress it
Go to the source directory
$ python setup.py build
$ sudo python setup.py install
