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creative process related notes

Raspberry Pi tips

Notes for basic installation of multimedia control devices.

Install OS from image:
https://www.raspberrypi.org/downloads/raspbian

Flash to SD with Etcher

2. Continue with options:
for official Pi keyboard install English-US

3. Update repositories for new versions of installed packages:

$ sudo get-apt update

4. Or, update everything to the new versions:

$ sudo apt-get upgrade

(can be single command: apt-get update && apt-get upgrade)

Configuring using the console:

$ sudo raspi-config

1. Enable SSH (in the example output is being set to 2, which is HDMI. Setting the output to 1 switches to analog-jack. The default setting is 0, which is automatic.)

$ amixer cset numid=3 2

From the setup screen > advanced options > audio (HDMI or Analog)

2. Expand file-system.

SOFTWARE:

Firefox: $ sudo apt-get install firefox-esr
Processing: $ curl https://processing.org/download/install-arm.sh | sudo sh

NETWORK : can access Pi thru MacOS :

$ sudo apt-get update
$ sudo apt-get install netatalk

Raspberry will be in the Finder

To be able to access a USB flash with the project’s data files. (e.g. audio or video):

Instalar usbmount: 

$ sudo apt-get install usbmount

Assigning URL’s to the USB (the PEN´s title must be the same)
e.g. Processing:

$ player = new SoundFile(this, "/media/pi/USB4GB/audiofile.aiff");

HARDWARE:

Power Switch:

Turning off the Pi safely at the end of the day/session: shutdown/reset button:
https://www.hackster.io/glowascii/raspberry-pi-shutdown-restart-button-d5fd07

1. Add folder and python´s file:
mkdir Scripts
cd Scripts
touch shutdown_pi.py

2. Go auto-run for the script:
$ sudo nano /etc/rc.local

3. Add this line before the last instruction exit 0 *:
python /home/pi/Scripts/shutdown_pi.py &

and that’s it! Restart to check if it works

LED state indicator (to know when to shut-off) :

Based in the project:
# Build a Simple Raspberry Pi LED Power/Status Indicator
https://howchoo.com/g/ytzjyzy4m2e/build-a-simple-raspberry-pi-led-power-status-indicator

Connections LED:
PIN6 > 300ΩR > GND > LED cathode (short)
PIN8 > LED anode (long)

Edit/boot/config.txt and add this line:
enable_uart=1

if you don’t give permission, copy by command line:

$ sudo cp /home/pi/Desktop/config.txt /boot/config.txt



Raspbian – video looper

Installation of an automatic video player with Raspberry :
Distro: 2019-04-08-raspbian-stretch-lite.zip

No graphical interface (GUI) view. Only the system for using hardware resources.

After the usual installation and configuration of the OS :
https://learn.adafruit.com/raspberry-pi-video-looper/installation

Ativate SSH :

  1. Copy SSH file (any file e.g. .txt) blank, name SSH and remove the extension. A “black” file called SSH remains.
  2. Move it to the root of the SD card
  3. Connnect Rapsberry to the network (LAN better)
  4. Use Pi Finder.app (or another pc/mac) to find raspberry and
    login via SSH:
  5. login ( #pi – #raspberry ) 
    sudo apt-get update
    sudo apt-get install -y git
    git clone https://github.com/adafruit/pi_video_looper.git
    cd pi_video_looper
    sudo ./install.sh

OPTIONS:

Deactivate LOOPER:

ESC by keyboard on the Raspberry

or temporarily by SSH:

sudo supervisorctl stop video_looper

permanently deactivate:

cd pi_video_looper
sudo ./disable.sh