All you need to build your 3D Scanner

OpenScan

Overview:

The Raspberry Pi + OpenScan Pi Shield can be used to control two independent stepper motors and a variety of different cameras (Pi Camera, DSLR - via GPhoto and external Cameras like Smartphone and others). The mechanism can be used in various forms (see for example https://www.thingiverse.com/thing:3050437 or https://www.thingiverse.com/thing:2944570 and it could be easily adapted to be used as a camera slider or in other mechanisms.

Setup

In order to add the OpenScan functionality to an existing raspbian system and understand all the dependencies, here is a full step-by-step list of the setup:

sudo apt-get update
sudo apt-get upgrade
mkdir -p /home/pi/shared/ui/data/old_flows && mkdir /home/pi/shared/log

Dependencies

sudo apt-get install python3-pip && sudo apt-get install python-pip && sudo apt-get install python-pil

PiCamera

sudo apt-get install python3-picamera && sudo apt-get install python-picamera

sudo raspi-config

–> interface options –> enable camera

Increase GPU Memory

(which seems to be needed for a stable operation of the interface)

sudo raspi-config

–>Performance Options –> GPU Memory –> 256 (instead of 128)

Samba

Samba is a fileserver, that allows you to access the Pi’s filesystem via network folders. This functionality is optional but comes in quite handy.

sudo apt-get install samba samba-common-bin

sudo nano /etc/samba/smb.conf

Change the following lines:

workgroup = WORKGROUP
wins support = yes  
read only = no

Add to the end of the file:

[PiShare]
comment=Raspberry Pi Share
path=/home/pi/shared
browseable=Yes
writeable=Yes
only guest=no
create mask=0777
directory mask=0777
public=yes

Set a network password:

sudo smbpasswd -a pi

Now you can access the filesystem of the raspberry pi through your network folder using the username “pi” and the given password.

Gphoto2

GPhoto2 is used to control DSLR cameras, which can be connected via USB. For a list of all supported cameras that can be used within this project see: https://raw.githubusercontent.com/OpenScanEu/OpenScan/master/supported_cameras

For more details see: http://www.gphoto.org/doc/

sudo apt install libgphoto2-dev
sudo apt install gphoto2

sudo pip3 install -v gphoto2
sudo pip install -v gphoto2

for a list of all supported cameras see: http://www.gphoto.org/doc/remote/

NodeRed

NodeRed offers a great browser interface in order to control the steppers, cameras and accessories. For more details see: https://nodered.org/docs/getting-started/raspberrypi

Install NodeRed:

bash <(curl -sL https://raw.githubusercontent.com/node-red/linux-installers/master/deb/update-nodejs-and-nodered)

Set NodeRed to start automatically on boot:

sudo systemctl enable nodered.service

Time to restart the pi :)

sudo reboot -h

Change the default public folder of NodeRed by running

sudo nano /home/pi/.node-red/settings.js

And uncomment and change the following line (httpStatic:…):

httpStatic: '/home/pi/shared/',

Add the some palettes to NodeRed:

node-red-stop
cd ~/.node-red
npm install node-red-dashboard && npm install node-red-contrib-python3-function && npm install node-red-contrib-fs-ops && npm install node-red-contrib-isonline && npm i node-red-node-ui-table

Download the OpenScan Flow to node-red:

sudo wget -O /home/pi/.node-red/flows_raspberrypi.json https://raw.githubusercontent.com/OpenScanEu/OpenScan/master/update_universal.json

Restart and done :))

sudo reboot -h

After the setup you can access the frontend in your browser by typing: IP:1880/ui The backend can be reached via IP:1880

Optional: Change hostname

sudo raspi-config

–> Network Options –> Hostname

Change hostname to OpenScanPi

Adjust the NodeRed Settings by opening

sudo nano /home/pi/.node-red/settings.js

uncomment “flowFile: …” and change it to:

flowFile: 'flows_raspberrypi.json',

After the setup you can access the frontend in your browser by typing: OpenScanPi:1880/ui
The backend can be reached via OpenScanPi:1880
This works from any device, which is in the same network as the raspberry pi.

If you are logged in to your pi, you can also enter the user interface directly through localhost:1880/ui

Usage & Manual

For more information on the usage of the OpenScan Interface please consult the manual: https://github.com/OpenScanEu/OpenScan/raw/master/Manual_en.pdf