quest

useful things

start:

node app.js

Обновление raspberry raspbian

sudo apt-get upgrade
sudo apt-get update

linux-arm node.js

Download Node.js source Raspberry Pi Model A, B, B+ and Compute Module

wget https://nodejs.org/dist/v4.0.0/node-v4.0.0-linux-armv6l.tar.gz 
tar -xvf node-v4.0.0-linux-armv6l.tar.gz 
cd node-v4.0.0-linux-armv6l

Raspberry Pi 2 Model B

wget https://nodejs.org/dist/v4.0.0/node-v4.0.0-linux-armv7l.tar.gz 
tar -xvf node-v4.0.0-linux-armv7l.tar.gz 
cd node-v4.0.0-linux-armv7l

Copy to /usr/local

sudo cp -R * /usr/local/

That's it! To check Node.js is properly install and you have the right version, run the command node -v

script autorun

Auto running a script
Create the script
Create a folder to store the script in

mkdir ./bin
cd ./bin

Create the script using the nano text editor

sudo nano script_auto_run
In the nano editor, type this script:

#!/bin/bash
# Script to start our application
echo "Doing autorun script..."
sudo /home/pi/projects/my_project.a &

Replace "sudo /home/pi/projects/my_project.a &" with the commands you want carried out.
The "&" means do the command in the background.

Note that when executing a command without logging is as a user you can't depend on any path or environment variables so you must provide full paths to everything.

Save it by pressing Ctrl+X, " Y", ENTER

This script needs to be made executable by typing this:

sudo chmod 755 script_auto_run

You can test the script works by typing

/home/pi/bin/script_auto_run

Setting it to be run
To launch the script at start-up edit the “rc.local” file needs to be edited.

sudo nano /etc/rc.local

Add the following line:

/home/pi/bin/script_auto_run

Save it by pressing Ctrl+X, " Y", ENTER

Re-boot your RPi and it will run.

omxplayer install

sudo apt-get update
sudo apt-get -y install omxplayer

Usage: omxplayer [OPTIONS] [FILE] Options : -h / --help print this help -n / --aidx index audio stream index : e.g. 1 -o / --adev device audio out device : e.g. hdmi/local -i / --info dump stream format and exit -s / --stats pts and buffer stats -p / --passthrough audio passthrough -d / --deinterlace deinterlacing -w / --hw hw audio decoding -3 / --3d mode switch tv into 3d mode (e.g. SBS/TB) -y / --hdmiclocksync adjust display refresh rate to match video (default) -z / --nohdmiclocksync do not adjust display refresh rate to match video -t / --sid index show subtitle with index -r / --refresh adjust framerate/resolution to video -g / --genlog generate log file -l / --pos n start position (in seconds) --boost-on-downmix boost volume when downmixing --vol n Set initial volume in millibels (default 0) --subtitles path external subtitles in UTF-8 srt format --font path subtitle font (default: /usr/share/fonts/truetype/freefont/FreeSans.ttf) --font-size size font size as thousandths of screen height (default: 55) --align left/center subtitle alignment (default: left) --lines n number of lines to accommodate in the subtitle buffer (default: 3) --win "x1 y1 x2 y2" Set position of video window --audio_fifo n Size of audio output fifo in seconds --video_fifo n Size of video output fifo in MB --audio_queue n Size of audio input queue in MB --video_queue n Size of video input queue in MB

pid=$(ps -o pid= -C omxplayer)
kill $pid

mkfifo /tmp/cmd

omxplayer -ohdmi mymedia.avi < /tmp/cmd

echo . > /tmp/cmd (Start omxplayer running as the command will initial wait for input via the fifo)

echo -n p > /tmp/cmd - Playback is paused

echo -n q > /tmp/cmd - Playback quits

 NOREFRESH=1 omxplayer video.mp4

rasberry autologin

How to automatically login to Raspberry Pi text console as pi user. Step 1: Open a terminal session and edit inittab file. sudo nano /etc/inittab Step 2: Disable the getty program. Navigate to the following line in inittab 1:2345:respawn:/sbin/getty 115200 tty1

And add a # at the beginning of the line to comment it out #1:2345:respawn:/sbin/getty 115200 tty1 Step 3: Add login program to inittab. Add the following line just below the commented line1:2345:respawn:/bin/login -f pi tty1 </dev/tty1 >/dev/tty1 2>&1 This will run the login program with pi user and without any authentication
Step 4: Save and Exit.
Press Ctrl+X to exit nano editor followed by Y to save the file and then press Enter to confirm the filename.
Reboot the pi and it will boot straight on to the shell prompt pi@raspberrypi without prompting you to enter username or password. But this isn't enough; you need your Pi to automatically run some command or a script. which is explained in the next section.
Run a Script after login
How to automatically run a script after login.
Step 1: Open a terminal session and edit the file /etc/profile
sudo nano /etc/profile
Step 2: Add the following line to the end of the file
. /home/pi/your_script_name.sh
replace the script name and path with correct name and path of your start-up script.
Step 3: Save and Exit
Press Ctrl+X to exit nano editor followed by Y to save the file.