Traditionally this was handled by doorpi. However, that pi has too much stuff hanging off it, and was very out of date. There was an issue of a loud pop occurring before any sound played, this was fixed in later firmware updates. Rob has purchased a pi (original B), amplifier and speakers for the purpose and documents them thus:
Sounds and TTS messages are triggered via the message bus.
Examples for testing might be something like:
Play a sound file:
mosquitto_pub -h mqtt -t 'sound/g1/play' -m canttouchthis.mp3
Play a list of sound files with no gap:
mosquitto_pub -h mqtt -t 'sound/g1/playlist' -m "long_long_man/long.mp3,long_long_man/loooong.mp3,long_long_man/maaaan.mp3"
Text-to-speech message (with a subtle notification bong):
mosquitto_pub -h mqtt -t 'sound/g1/speak' -m "All your base are belong to us"
Text-to-speech message (with a clear airport/transit chiming sound):
mosquitto_pub -h mqtt -t 'sound/g1/announce' -m "Good evening, my sensors indicate that the laser cutter may be on fire."
Theory: You could direct sound two only two rooms at once by playing the left or right channel only. By default mpg123 is called with the -m option to ensure that the output is mono and thus the same sound comes out every speaker.
Use the web file browser at http://squawk.hacklab:8080/.
Latest Raspberry Pi OS, installed using Raspberry Pi Imager.
Appended to /etc/fstab:
tmpfs /var/log tmpfs defaults,noatime,nosuid,mode=0755,size=100m 0 0 tmpfs /tmp tmpfs defaults,noatime,nosuid,size=100m 0 0 tmpfs /var/tmp tmpfs defaults,noatime,nosuid,size=30m 0 0 tmpfs /var/log tmpfs defaults,noatime,nosuid,mode=0755,size=100m 0 0 tmpfs /var/run tmpfs defaults,noatime,nosuid,mode=0755,size=2m 0 0 tmpfs /var/spool/mqueue tmpfs defaults,noatime,nosuid,mode=0700,gid=12,size=30m 0 0
sudo apt-get install mpg123 sudo apt-get install sox sudo apt-get install python3-pip sudo pip install --break-system-packages paho-mqtt
/etc/systemd/system/squawk.service
[Unit] Description=Runs the squawk listener script [Service] ExecStart=/home/pi/startup.sh & /home/pi/respawn --syslog --max-backoff=10 /home/pi/squawk.pi [Install] WantedBy=multi-user.target
…and enabled with
$ sudo systemctl start squawk $ sudo systemctl enable squawk
Various scripts to make things happen.
#!/usr/bin/env python import paho.mqtt.client as mqtt import subprocess import os import logging import signal import time import random logging.basicConfig(level=logging.INFO) max_playtime = 15 sounds_path = "/home/pi/sounds" status = 'closed' # runs a command and terminates it after a specified timeout def call_with_timeout(command, timeout): logging.info('call_with_timeout(%r, %r)' % (command, timeout)) class TimeoutException(Exception): pass def alrm_handler(signum, frame): raise TimeoutException() try: old_handler = signal.signal(signal.SIGALRM, alrm_handler) signal.alarm(timeout) p = subprocess.Popen(command) retcode = p.wait() logging.info('call_with_timeout: command exited with code %s' % (retcode)) except TimeoutException: logging.info('call_with_timeout: command exceeded timeout, terminating...') p.terminate() retcode = p.wait() finally: signal.signal(signal.SIGALRM, old_handler) signal.alarm(0) return retcode # waffle waffle def speak(data, timeout=max_playtime): command = ['/home/pi/pico.sh', data] call_with_timeout(command, timeout=timeout) def getfiles(path, exts=[".mp3", ".wav"]): allfiles = [] for dirpath, dirnames, filenames in os.walk(path): for filename in filenames: base, ext = os.path.splitext(filename) if ext in exts: #allfiles.append(os.path.relpath(os.path.join(dirpath, filename), path)) allfiles.append(os.path.join(dirpath, filename)) return allfiles # make some noise for the vengaboys def play(filename, timeout=max_playtime): allfiles = getfiles(sounds_path) filename = os.path.join(sounds_path, filename) if filename.endswith('/'): # pick a random file from a directory candidates = [] for f in allfiles: if f.startswith(filename): candidates.append(f) if len(candidates) == 0: logging.error('No files matching %s' % (filename)) return filename = random.choice(candidates) else: # single file requested if filename not in allfiles: logging.error('File %s not found' % (filename)) return base, ext = os.path.splitext(filename) if ext == '.mp3': command = ['mpg123', '-q', '-m', filename] call_with_timeout(command, timeout=timeout) else: command = ['play', '-q', filename] call_with_timeout(command, timeout=timeout) def on_connect(client, userdata, flags, rc): client.subscribe("sound/g1/play") client.subscribe("sound/g1/speak") client.subscribe("sound/g1/announce") client.subscribe("display/doorbot/intercom") client.subscribe("labstatus") def on_message(client, userdata, msg): global status if msg.topic == 'labstatus': if msg.payload == 'open': status = 'open' else: status = 'closed' # ignore retained (non-realtime) messages if msg.retain: return if msg.topic == 'sound/g1/play': play(msg.payload) if msg.topic == 'sound/g1/speak': play('dongq.mp3') speak(msg.payload) if msg.topic == 'sound/g1/announce': play('chime.mp3') speak(msg.payload) if msg.topic == 'access/entrance/request': if status == 'closed': play('doorbell.mp3') m = mqtt.Client() m.on_connect = on_connect m.on_message = on_message m.connect("mqtt") m.loop_forever()
#!/usr/bin/env python # # Tim Hawes <me@timhawes.com> # April 2015 # import argparse import logging import logging.handlers import os import signal import subprocess import sys import time process = None hup_received = False term_received = False parser = argparse.ArgumentParser(description='Respawn an application.') parser.add_argument('--name', type=str, dest='name', action='store') parser.add_argument('--delay', type=int, dest='delay', action='store', default=1) parser.add_argument('--min-backoff', type=int, dest='min_backoff', action='store', default=1) parser.add_argument('--max-backoff', type=int, dest='max_backoff', action='store', default=60) parser.add_argument('--reset-backoff-after', type=int, dest='backoff_reset_after', action='store', default=30) parser.add_argument('--syslog', dest='syslog', action='store_true', default=False) parser.add_argument('--debug', dest='debug', action='store_true', default=False) parser.add_argument('command', nargs='*') args = parser.parse_args() def setup_logging(log_level=logging.INFO, syslog=True, stdout=False, ident=os.path.basename(sys.argv[0])): logger = logging.getLogger() logger.setLevel(log_level) if syslog: syslog_format_string = ident + "[%(process)d]: %(message)s" syslog_handler = logging.handlers.SysLogHandler(address="/dev/log", facility=logging.handlers.SysLogHandler.LOG_USER) syslog_handler.log_format_string = "<%d>%s" syslog_handler.setFormatter(logging.Formatter(fmt=syslog_format_string)) syslog_handler.setLevel(log_level) logger.addHandler(syslog_handler) if stdout: stream_format_string = "%(asctime)s %(message)s" stream_handler = logging.StreamHandler(stream=sys.__stdout__) stream_handler.setFormatter(logging.Formatter(fmt=stream_format_string)) stream_handler.setLevel(log_level) logger.addHandler(stream_handler) def run(): global process start_time = time.time() process = subprocess.Popen(args.command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT) while True: line = process.stdout.readline() if line == '': break logging.info("< " + line.rstrip()) returncode = process.wait() runtime = time.time()-start_time process = None if returncode == 0: logging.info('exit=%d runtime=%.3f' % (returncode, runtime)) else: logging.warning('exit=%d runtime=%.3f' % (returncode, runtime)) return returncode, runtime def hup_handler(signum, frame): global process global hup_received if process is not None: logging.warning("received SIGHUP, sending SIGTERM to process") hup_received = True process.send_signal(signal.SIGTERM) else: logging.warning("received SIGHUP, but no process running") def term_handler(signum, frame): global process global term_received if process is not None: logging.warning("received SIGTERM, sending SIGTERM to process") term_received = True process.send_signal(signal.SIGTERM) else: logging.warning("received SIGTERM, but no process running") term_received = True signal.signal(signal.SIGHUP, hup_handler) signal.signal(signal.SIGTERM, term_handler) ident = os.path.basename(sys.argv[0]) if args.name is not None: ident = ident + "/" + args.name if args.debug: setup_logging(log_level=logging.DEBUG, stdout=True, syslog=False, ident=ident) else: setup_logging(log_level=logging.INFO, stdout=False, syslog=True, ident=ident) if args.delay > args.min_backoff: logging.debug('increasing min-backoff to match delay (%d)' % (args.delay)) args.min_backoff = args.delay if args.min_backoff > args.max_backoff: logging.debug('increasing max-backoff to match min-backoff (%d)' % (args.min_backoff)) args.max_backoff = args.min_backoff exit_requested = False backoff = args.min_backoff logging.info("command: %r" % (args.command)) while True: start_time = time.time() returncode, runtime = run() if term_received: logging.debug("exited after SIGTERM") break if hup_received: logging.debug("exited after SIGHUP, restarting immediately") hup_received = False continue if returncode == 0: if runtime > args.backoff_reset_after: backoff = args.min_backoff logging.debug('resetting backoff to %d' % (backoff)) else: logging.debug('delaying for %d after a successful run' % (args.delay)) time.sleep(args.delay) else: logging.info('backing-off for %d seconds' % (backoff)) time.sleep(backoff) backoff = min(backoff*2, args.max_backoff) logging.debug('next backoff will be %d seconds' % (backoff)) logging.info('exiting respawn')
#!/bin/bash pico2wave -l en-GB -w /tmp/pico.wav "$1" play -q /tmp/pico.wav rm -f /tmp/pico.wav
#!/bin/bash sleep 3 _IP4=$(hostname -I | cut -d ' ' -f 1) || true mpg123 -m -q /home/pi/sounds/indyboot.mp3 /home/pi/pico.sh "System boot complete. IP address is $_IP4"
These live in /home/pi/sounds and can be wav or mp3. Generally prefer mp3. SCP new ones into here.
pi@squawk:~ $ ls -l /home/pi/sounds/ total 504 -rw-r--r-- 1 pi pi 9249 Oct 4 22:32 alert12.mp3 -rw-r--r-- 1 pi pi 8594 Oct 4 22:32 bingo.mp3 -rw-r--r-- 1 pi pi 59350 Oct 4 22:32 canttouchthis.mp3 -rw-r--r-- 1 pi pi 11703 Oct 4 22:32 cheese.mp3 -rw-r--r-- 1 pi pi 71457 Oct 4 22:32 commandcodesverified_ep.mp3 -rw-r--r-- 1 pi pi 7713 Oct 4 22:32 computerbeep_4.mp3 -rw-r--r-- 1 pi pi 21759 Oct 5 02:24 dong.mp3 -rw-r--r-- 1 pi pi 118725 Oct 5 01:48 doorbell.mp3 -rw-r--r-- 1 pi pi 44329 Oct 5 02:07 indyboot.mp3 -rw-r--r-- 1 pi pi 90825 Oct 4 22:32 scatman.mp3 -rw-r--r-- 1 pi pi 5486 Oct 4 22:32 touchdown.mp3 -rw-r--r-- 1 pi pi 6414 Oct 4 22:32 uhoh.mp3 -rw-r--r-- 1 pi pi 27584 Oct 4 22:32 whistle.mp3
This is probably not required as we now use AWS TTS service.
mkdir ~/pico cd ~/pico wget http://incrediblepbx.com/picotts-raspi.tar.gz tar -zxf picotts-raspi.tar.gz sudo cp -R usr / cd /usr/src/pico_build sudo dpkg -i libttspico-data_1.0+git20110131-2_all.deb sudo dpkg -i libttspico0_1.0+git20110131-2_armhf.deb sudo dpkg -i libttspico-utils_1.0+git20110131-2_armhf.deb rm -rf ~/pico
The “squawk” unit lives above the IRC terminal, to the right of the main door in G1. It consists of a Raspberry Pi B and a TPA3116 based amplifier board.
There are four speakers connected, two per channel, located in each of the rooms on the ceiling. The speakers are 8 Ohm moisture resistant cheap ceiling speakers that have exceeded expectations and produce a surprisingly full sound. This opens up the potential for using them for background music in the future (e.g. via MPD).
Standard pi other than having some wires soldered on the underside of the board to connect to the 3.5mm audio jack. Powered via the header rather than USB.
Audio is input via the 3-pin header.
Power is input on the centre screw terminal, with left and right speaker outputs either side.
The system runs off a 19.5v laptop PSU located in the ceiling space. This is directly connected into the amplifier board, which is rated up to 24v. A spur from this connects to a DC-DC buck converter, supplying the Raspberry Pi with 5v. The original mini converter used was overheating and melting the heatshrink. It's now been replaced with a larger type which so far is running relatively cool.
Care should be taken when re-wiring as connecting the laptop PSU accidentally reverse polarity, to the speaker terminals, or to the speakers themselves will likely result in one or more of those being instantly destroyed.