expose-to-the-light

Tasks & Issues

• Sony A7S can only take one picture and then fails with gp_camera_capture failed with GP_ERROR_IO #-7: I/O problem
• Update Readme with Sony A7S specific setup: Use PC Remote option to let the computer connect to the camera

Install application

Download installer

curl -L -o install.sh https://www.dropbox.com/s/z5f5ch8997c1xmn/install.sh?dl=1

Install

• chmod u+x install.sh
• ./install.sh

The install.sh script downloads the latest jar and script files and then setup them to your PATH so you can use it later as any other unix command.

Runtime dependencies if you are not using the installer

Installer should install these dependencies for you.

On Mac Os

• brew cask install java11 [https://medium.com/macoclock/using-homebrew-to-install-java-jdk11-on-macos-44b30f497b38]
• brew install gphoto2
• brew install libgphoto2

On Raspberry Pi (unix)

• sudo apt-get install openjdk-11-jdk
• sudo apt install pkg-config
• sudo apt install gphoto2
• sudo apt install gnuplot

Run the app

ettl INFO /home/pi/dev/expose-to-the-light/logs/ --imagesBasePath /home/pi/dev/expose-to-the-light/captured-images/ --setSettings --numberOfCaptures 5 --intervalSeconds 5 --rawFileExtension CR2

First argument is the level of the logging ie: INFO, DEBUG, WARN, ERROR, TRACE Second argument is the location of the logs file.

You can use dummy camera to run a test and check your settings. Just use --dummyCamera as programme argument.

Distribute the app

Assembly jar

https://github.com/sbt/sbt-assembly

sbt assebmly

Publish artifact to github

https://github.com/djspiewak/sbt-github-packages

sbt publisher/publish

Publish artifact to Dropbox

Can generate new token from https://www.dropbox.com/developers/apps

• ./deploy.sh $dropbox_bearer_token $buildNumber
• ./deploy.sh abcd 4

Connect the camera to the computer

• Make sure the camera is in PTP mode.

For my Canon 70D I always have to 'Disable' the wifi connection otherwise the gphoto2 does not detect it.

• Connect the MacOs/raspberry pi and the camera by USB cable (no other type of cable will work)
• Run the gphoto2 --auto-detect to list what the gphoto2 lib sees

$ gphoto2 --auto-detect Model Port

Canon EOS 70D usb:020,005

• Final test that everything is okey gphoto2 --summary

Errors at the start

gphoto2.GPhoto2Error: [-105] Unknown model

Chance is your camera is not connected to the computer

• Is it turned on?
• Is the USB cable connected?
• Is it in PTP mode?

gphoto2.GPhoto2Error: [-53] Could not claim the USB device

Kill the running gphoto2 processes!

ps aux | grep gphoto

pi         745  0.0  0.7  43780  7252 ?        Ssl  14:14   0:00 /usr/lib/gvfs/gvfs-gphoto2-volume-monitor
pi        1439  0.1  1.0 116320 10172 ?        Sl   14:26   0:00 /usr/lib/gvfs/gvfsd-gphoto2 --spawner :1.4 /org/gtk/gvfs/exec_spaw/1
pi        1461  0.0  0.0   7348   572 pts/0    S+   14:28   0:00 grep --color=auto gphoto

• kill -9 745
• kill -9 1439

Useful docs

• http://www.gphoto.org/doc/remote/
• http://gphoto-software.10949.n7.nabble.com/Beginner-Using-libgphoto2-how-to-find-set-config-values-td16449.html

Remote monitoring

via SSH

The app is running on my raspberry pi which is connected to a powerbank and to the camera.

I trigger the ettl app from a machine remotely. (In order to SSH into the raspberry pi in the middle of nowhere you need a phone)

Turn on tethering on the phone and connect the raspberry pi and your computer via wifi. (raspberry pi needs to be setup to connect when you have screen etc.)

Then just ssh into the raspberry pi from the computer ssh -o ConnectTimeout=5 pi@172.20.10.12

via Web interface

Use the ettl-web application and use its UI to control and monitor the ettl app.

Install on raspberry pi

• Installing raspbian on SD card
  • Install Raspberry Pi OS using Raspberry Pi Imager
  • Fully fledged version
• Install hotspot on the pi - so you can use it anywhere without wifi
  • Autohotspot
  • I have to modify the nameserver dns lookup list after this
    • open file sudo nano /etc/resolv.conf and add
      • nameserver 8.8.8.8
      • nameserver 8.8.4.4
• Install ettl app
  • Use the link from the beginning of this README file to download the installer