162 lines
3.0 KiB
Markdown
162 lines
3.0 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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* 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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