Raspberry Pi Zero Timelapse

Tech Stack

• Python 3.4
• Flask
• ImageMagick
• Raspberry Pi 3
• Raspberry Pi Camera

Startup

For GIF making magic install ImageMagick with sudo apt install imagemagick.

python3 manage.py

Objective

Trigger timelapse capture from my phone via password protected website.

Deploy

Create directories

mkdir picam/client/static/{archive,gifs,images,timelapse}

systemd

/etc/systemd/system/photos.service

[Unit]
Description=Gunicorn instance to take timelapses
After=network.target

[Service]
User=pi
Group=www-data
WorkingDirectory=/home/pi/Projects/Photos
ExecStart=/usr/local/bin/gunicorn --workers 3 --timeout 999 -k gevent --threads 12 --bind unix:photos.sock -m 007 wsgi:app

[Install]
WantedBy=multi-user.target

sudo systemctl status photos.service

sudo systemctl start photos.service

sudo systemctl stop photos.service

nginx

/etc/nginx/sites-available/default

upstream flask_server {
        # swap the commented lines below to switch between socket and port
        server unix:/home/pi/Projects/Photos/photos.sock fail_timeout=0;
        # server 127.0.0.1:5000 fail_timeout=0;
}
server {
	listen 2002;
	server_name domain-name-of-yours.com;

	# Set up proxy for app
	location / {
	    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $http_host;
            proxy_redirect off;

	    include proxy_params;
	    proxy_pass http://flask_server;
	}
	
	# Configure NGINX to deliver static content from the specified folder
    location /static {
       alias /home/pi/Projects/Photos/picam/client/static;
    }
}

End Points

/ - takes a photo and displays it

/view - view all single photos

/timelapse - takes 50 photos with a 5 second delay

/gif - create gif from last timelapse

/animations - view all timelaps gifs

/archive - contains list of zipped up timelapse images

References

Documentation

http://picamera.readthedocs.io/en/release-1.11/fov.html

http://flask.pocoo.org/docs/0.11/

Tutorials

https://www.raspberrypi.org/learning/getting-started-with-picamera/worksheet/

https://www.raspberrypi.org/learning/timelapse-setup/worksheet/

https://www.raspberrypi.org/learning/python-web-server-with-flask/worksheet/

http://stackoverflow.com/questions/10961378/how-to-generate-an-html-directory-list-using-python/10961991#10961991

Notes

to make a gif from the timelapse images: convert -delay 20 -loop 0 image*.jpg result.gif