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Using Telegram to interact with an LED Matrix

In this presentation I will show you how to interact with an LED Matrix using Telegram and a Raspberrypi

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Using Telegram to interact with an LED Matrix

  1. 1. It is amazing what you can do with 128 pixels Xavier Orduña Python Meetup BCN 26th November (Using Telegram as an Interface for an LED wall)
  2. 2. Back to the Origin (2.560 x 1.600 pixels)(84 x 47 pixels) (160 x 144 pixels)
  3. 3. The Challenge
  4. 4. The Screen A lot of wiring!! 128 px 128px 80 cm 80cm About 1000 EUR in electronics!
  5. 5. Architecture Telegram Bot Redis DB (Model) Amazon S3 (Images) Flask API Celery (tasks) HDMI + LED Controller GPIO Header
  6. 6. Telegram Bot •  API: •  Python Library: telegram-bot •  New bot token: @BotFather •  Bot name: walledbot
  7. 7. Telegram Bot (here goes the logic with the messages)
  8. 8. Telegram Bot (gets a photo or text and posts it to our API)
  9. 9. Telegram Bot (Send a message to the user) (Send a keyboard to the user)
  10. 10. Model in Redis •  The most easy and FUN database •  You can represent complex models ( •  Key, value storage with steroids (sets, lists, hashes) •  All operations are atomic •  You can use Redis Desktop Manager (linux, mac, windows)
  11. 11. Model in Redis •  walls_list list  of  wall  id’s   •  wall_ids  counter  with  last  wall  id   •  posts_ids  counter  with  last  post  id   •  walls:  list  with  wall  ids   •  walls:WALL_ID  hash  with  wall  data   •  posts:POST_ID  hash  with  post  data   •  walls_posts:WALL_ID  list  with  posts  id’s      
  12. 12. Model in Redis
  13. 13. API (Flask) •  Its easy and well documented •  Almost everything included (jinja2, sessions, cookies, request, …) •  Very similar to bottle •  Can be deployed using uWSGI or run standalone •  API and Web app all in one!
  14. 14. API (Flask)
  15. 15. API (Flask)
  16. 16. API (Flask)
  17. 17. Celery Task Mngt •  Task manager easy to use! •  It can use Redis as a Backend and Broker •  But also MongoDB or RabbitMQ
  18. 18. Celery Task Mngt
  19. 19. Convert to image Fonts from:
  20. 20. Convert to image a3er  a  couple  of  hours  trying  to  resize  an  image,    I  decied  to  use  a  script  found  in  somewhere:  h;ps://    
  21. 21. Amazon S3 •  Easy place to store images •  Organized in buckets •  Best library is “boto” •  You should create new keys for your application •  The AWS backend is sometimes confusing
  22. 22. Amazon S3
  23. 23. LED Matrix Available at: (40 USD)
  24. 24. LED Wall Tutorial here: It is fun to build it, but you can find it already mounted and ready to go!
  25. 25. RaspberryPI •  Last version: Raspberry PI 2 Model B •  Less than 40 USD •  1 Gb RAM •  To speedup development share the home folder using samba •  If you plan to play with it, get a keyboard and a screen.
  26. 26. RaspberryPI LED  GPIO  HAT  available  at  Adafruit,  it  can  manage  up  to  4  32x32  LED  Matrix  
  27. 27. RaspberryPI Chinese LED wall controller. Input is DVI and it maps W x H pixels to LED wall (300 USD)
  28. 28. RaspberryPI
  29. 29. Framebuffer •  PyGame enables us to access the framebuffer directly •  We can show images or sprites •  Programs to modify framebuffer must run with sudo
  30. 30. Framebuffer
  31. 31. The Result
  32. 32. Thank you! code: