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Picamera, Flask and the Twitter API Raspberry Pi workshop

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Picamera, Flask and the Twitter API Raspberry Pi workshop

  1. 1. Raspberry Pi Creative Technologists Sheffield July 2015
  2. 2. Self-directed workshop ● Use the Terminal (command line interface) ● Install software (apt and pip) ● Use the web browser (that's where the good stuff is) ● Use GitHub (download projects, upload your own) ● Use APIs (Application Programming Interfaces) ● Ask questions! ● Take notes! ● Expand your understanding! ● Ask for help!
  3. 3. Connect the camera
  4. 4. Boot the Pi and log in
  5. 5. Test the camera ● raspistill -k ● If it doesn't work, is your camera connected correctly? ● Is your camera enabled? – sudo raspi-config – Enable camera ● Press Ctrl + C to exit the preview
  6. 6. Browse my project on GitHub ● Open the web browser ● Go to https://github.com/bennuttall/bett-bot ● Read the instructions ● Do the instructions: – Install pip – Install flask – Download the repo – Install twython
  7. 7. Run the app ● Enter the bett-bott folder – cd bett-bott ● Run the app – python app.py ● Open 127.0.0.1:5000 in the web browser ● Click Capture to take a photo ● See the photo in the gallery ● Click the photo ● Take more photos ● Find your IP address (e.g. 192.168.1.8) – hostname -I ● Browse to http://192.168.1.8:5000 on your phone/tablet/laptop
  8. 8. Connect to Twitter ● Log in to www.twitter.com in the web browser (or sign up) ● Go to apps.twitter.com – Create new app – Set permissions to read and write – Generate access tokens (see Tweeting Babbage resource on raspberrypi.org for detailed instructions) – raspberrypi.org/learning/tweeting-babbage/worksheet/
  9. 9. Add your API keys ● Open auth.py with Python/IDLE ● Add your keys – consumer_key – consumer_secret – access_token – access_token_secret ● Run the app again – Open Terminal – cd bett-bot-master – python app.py ● Now you can tweet the pictures
  10. 10. Look at the code ● Open app.py with Python/IDLE ● What's it doing? – Imports – Try/except – Connect to Twitter – Define routes ● / ● /capture/ ● /view/ ● /tweet/ – Routes refer to HTML templates – Run Flask app
  11. 11. Hack it ● Change the appearance ● Add a feature ● Think about more to do later – ideas? ● Is a web app suitable? ● What's possible? What's not? ● Think about hardware installation ● Think about touch screens

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