Difference between revisions of "Raspberry Pi - Week 4"
From Robert-Depot
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== GPIO == | == GPIO == | ||
*What are the pins? | *What are the pins? | ||
| − | * | + | **http://elinux.org/RPi_Low-level_peripherals |
| − | **http://www.doctormonk.com/2013/02/raspberry-pi-and-breadboard-raspberry.html | + | *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 | *pin over-voltage protection circuits - http://elinux.org/RPi_Tutorial_EGHS:GPIO_Protection_Circuits | ||
*light example - https://projects.drogon.net/raspberry-pi/gpio-examples/tux-crossing/gpio-examples-1-a-single-led/ | *light example - 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> | **uses wiringPI, command line tool, for ex:<code>gpio</code> | ||
**installed using git - https://projects.drogon.net/raspberry-pi/wiringpi/download-and-install/ | **installed using git - https://projects.drogon.net/raspberry-pi/wiringpi/download-and-install/ | ||
| − | === | + | ===using pins with python=== |
*follow adafruit - http://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/overview | *follow adafruit - http://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/overview | ||
**Rpi.GPIO - | **Rpi.GPIO - | ||
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**python-rpi.gpio | **python-rpi.gpio | ||
*https://code.google.com/p/raspberry-gpio-python/ | *https://code.google.com/p/raspberry-gpio-python/ | ||
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Revision as of 08:45, 26 April 2013
Contents
Review
- Installed software with apt-get. (including festival).
- Installed and ran VNC to get a remote desktop on the machine.
- Ran a simple python script to synthesize speech ( example)
- Another python tutorial: Learn Python the Hard Way
Video Playback
- 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:
ffmpeg -i mouse_brain.wmv mouse_brain.mp4
- run omxplayer:
omxplayer ~/Movies/mouse_brain.mp4
- 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 homebrew
brew install ffmpeg
Scripting Video Playback
- We can send the hotkey controls via STDIN in python:
- shell script to play a directory of files. (good at corporate conventions)
GPIO
- What are the pins?
- Handy printable reference
- 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
- light example - https://projects.drogon.net/raspberry-pi/gpio-examples/tux-crossing/gpio-examples-1-a-single-led/
- uses wiringPI, command line tool, for ex:
gpio - installed using git - https://projects.drogon.net/raspberry-pi/wiringpi/download-and-install/
- uses wiringPI, command line tool, for ex:
using pins with python
- follow adafruit - http://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/overview
- Rpi.GPIO -
- requires python-dev
- python-rpi.gpio
- https://code.google.com/p/raspberry-gpio-python/
