104 lines
2.1 KiB
Markdown
104 lines
2.1 KiB
Markdown
# Announcement Box
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Linux box with a loudspeaker and an emergency light to be used for announcements and notifications.
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## Hardware
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### Overview
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* SBC with GPIOs and sound output :: OrangePi Zero with an expansion board
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* PA system
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* speaker :: 30W, 4 Ohms horn loudspeaker
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* sound amplifier :: mono 18W sound amplifier
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* relay module :: 12V low trigger relay
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* Warning Light system
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* warning light :: 12V 10W rotary orange warning light
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* relay module :: 12V low trigger relay
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* System Activity Light system
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* indicator LED
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* Human Activity Sensor system
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* PIR module
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### Building
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TBD
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## Software
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### Overview
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* Operating System - Linux :: Armbian Bullseye for the OrangePi Zero
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* PA System
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* Voice Synthesizer :: Festival / ESpeak
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### Installation
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Run as root:
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```bash
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cp toolkit/* /usr/local/bin/
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cp etc/systemd/system /etc/systemd/system
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systemctl enable --now system-activity-light.service
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systemctl enable --now human-activity-sensor.service
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```
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## Implementation Notes
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### Armbian + OrangePi Zero Installation
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#### Enable analog soundcard
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```
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sudo armbian-config
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# System > Hardware > [*] analog-codec
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```
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#### Software Dependencies
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##### OS Packages
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```bash
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apt install mplayer espeak-ng
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```
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##### GPIO toolkit
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```bash
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# upstream:
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#git clone https://github.com/orangepi-xunlong/wiringOP
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# enhanced:
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git clone https://github.com/Dejvino/wiringOP
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cd wiringOP
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./build clean
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./build
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```
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### PA System
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#### Enabling mixed sound output
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```bash
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cat ~/.asoundrc
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pcm.!default plug:dmix
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```
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#### Text to Speech
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```bash
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## Festival
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# reading
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...
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# to file
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text2wave text.txt > wave.wav
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## ESpeak
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# voices:
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ls /usr/lib/arm-linux-gnueabihf/espeak-data/voices/
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# reading
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espeak -f text.txt -p 40 -s 160 -v "en-us"
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# to file
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espeak -f text.txt -p 40 -s 160 -k15 -g 1 -w wave.wav
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# using SSML (e.g.: https://www.xml.com/pub/a/2004/10/20/ssml.html)
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espeak -f ssml.txt -m
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```
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#### Converting into a low-quality broadcast audio
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```bash
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sox infile.wav outfile.wav downsample echo 0.5 1 1 1
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```
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### Human Activity Sensor
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#### Reading File Timestamp
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```bash
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stat /var/tmp/human_last_seen --format=%Y
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```
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