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→using GPIO with python
*Ran a simple python script to synthesize speech ([[Raspberry_Pi_-_Week_3#Festival_example | example]])
*Another python tutorial: [http://learnpythonthehardway.org/book/ Learn Python the Hard Way]
== Video Playback ==
*[https://github.com/huceke/omxplayer Omxplayer] is a video player specifically made for the Raspberry PI's GPU made by Edgar (gimli) Hucek from the XBMC project.
**omxplayer comes pre-installed on our raspbian distribution.
*Try it out.
*Copy a movie file to your raspberry pi using scp. The movie needs to be .mp4 format.
**you can transcode with ffmpeg:
**<code>ffmpeg -i mouse_brain.wmv mouse_brain.mp4</code>
*run omxplayer:
**<code>omxplayer ~/Movies/mouse_brain.mp4</code>
*You can control playback with a number of hotkeys:
**http://elinux.org/Omxplayer#Hotkeys
**Try these, and notice the responsiveness of the system. Is there any noticable delay?
===ffmpeg===
*Install this on your computer, not the raspberry pi.
**install homebrew
**<code>brew install ffmpeg</code>
*using ffmpeg to transcode a video file:
**<code>ffmpeg -i ~/Movies/dogkiss.mov dogkiss.mp4</code>
== Scripting Video Playback ==
[http://wiki.roberttwomey.com/images/a/ad/Video_loop.tar video_loop.tar]
*We can send the hotkey controls via STDIN in python:
**http://stackoverflow.com/questions/12755968/sending-arrow-keys-to-popen
*shell script to play a directory of files. (good at corporate conventions)
**http://www.cenolan.com/2013/03/looping-video-playlist-omxplayer-raspberry-pi/
== GPIO ==
*What are the pins?
**http://elinux.org/RPi_Low-level_peripherals
*Handy printable reference
**Raspberry Leaf - http://www.doctormonk.com/2013/02/raspberry-pi-and-breadboard-raspberry.html
*Other headers, not yet populated
**P5, etc...
===Note on voltage Levels===
*RPi is 3.3V.
*pin over-voltage protection circuits - http://elinux.org/RPi_Tutorial_EGHS:GPIO_Protection_Circuits
==Tutorials==*light example Single LED- https://projects.drogon.net/raspberry-pi/gpio-examples/tux-crossing/gpio-examples-1-a-single-led/**uses wiringPI, command line tool, for ex:<code>gpio</code>**installed using git GPIO examples- https://projects.drogon.net/raspberry-pi/wiringpi/downloadgpio-and-installexamples/===through python===*follow adafruit - httpLCD interface https://learnprojects.adafruitdrogon.comnet/adafruits-raspberry-pi-lesson-4-/gpio-setupexamples/overview**Rpi.GPIO lcd- interface/**requires python-dev**===using GPIO with python-rpi.gpio===
*https://code.google.com/p/raspberry-gpio-python/