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# 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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* 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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## Software |
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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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## 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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#### Initialize GPIOs |
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```bash |
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# System Activity Indicator |
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PIN_SALIGHT=11 |
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gpio mode $PIN_SALIGHT output |
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# Emergency Light system |
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PIN_ELIGHT=7 |
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gpio mode $PIN_ELIGHT output |
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# PA system |
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PIN_PASOUND=5 |
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gpio mode $PIN_PASOUND output |
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``` |
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### PA System |
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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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#### Playing a sound file |
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```bash |
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aplay file.wav |
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mplayer file.mp3 |
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``` |
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### Emergency Light |
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#### Control Script |
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```bash |
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cat /usr/local/bin/emergency-light |
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#!/bin/bash |
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PIN_ELIGHT=7 |
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# init |
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gpio mode $PIN_ELIGHT output |
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# command |
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if [[ "$1" == "on" ]]; then |
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gpio write $PIN_ELIGHT 1 |
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elif [[ "$1" == "off" ]]; then |
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gpio write $PIN_ELIGHT 0 |
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elif [[ "$1" == "read" ]]; then |
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gpio read $PIN_ELIGHT |
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else |
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gpio toggle $PIN_ELIGHT |
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fi |
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``` |
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### System Activity Light |
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#### System Usage |
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```bash |
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uptime | head -n 1 | cut -f3 -d, | cut -f2 -d: |
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``` |
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#### Daemon |
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```bash |
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cat /etc/systemd/system/system-activity-light.service |
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[Unit] |
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Description=System Activity Light Daemon |
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[Service] |
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ExecStart=/usr/sbin/system-activity-light-daemon |
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[Install] |
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WantedBy=multi-user.target |
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``` |
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```bash |
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cat /usr/sbin/system-activity-light-daemon |
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#!/bin/bash |
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DELAY=10000 |
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while [[ true ]]; do |
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ACTIVITY=2000 |
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TOP=`system-usage` |
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if (( $(echo "$TOP > 1.0" | bc -l) )); then |
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ACTIVITY=50 |
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elif (( $(echo "$TOP > 0.75" | bc -l) )); then |
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ACTIVITY=100 |
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elif (( $(echo "$TOP > 0.5" | bc -l) )); then |
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ACTIVITY=500 |
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elif (( $(echo "$TOP > 0.2" | bc -l) )); then |
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ACTIVITY=1000 |
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fi |
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echo $TOP |
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system-activity-light blink $ACTIVITY $DELAY |
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done |
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``` |
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```bash |
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sudo systemctl enable --now system-activity-light.service |
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``` |
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