Toubleshooting

Sounder

No audio with DAC+

The best way to test audio is to use the mpg321 command on the sounder with one your your sounds (/var/osb/sounder/sounds). If this give an error about device being in use this is most likely a known bug with the DAC+Pi where after a reboot the DAC is not detected.

The best fix is to de-power the Pi for 10+ seconds then boot it up again.

We have found in testing that with a few reboots it might come to life, if access isn’t easy.

Bell times are slightly out

By default NTP is switched off on the Pi, enable it by editing /etc/systemd/timesyncd.conf. You can set NTP= to pool.ntp.org or even better a time-server in your school, like the primary domain controller.