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The SD card must be FAT formatted. File names are restricted to 7.3-format: Up to 7 characters for the file name and up to 3 characters for the file extension.
File system is not case sensitive. Stick to plain ANSI character set for file names.
The configuration file is in JSON format. It is named setting.jsn and must be located in the SD card's root directory.
The current configuration file shows an example on how the system can be set up.
The behavior of each button (right or left) is configured here. Each button has a default mode and a silent mode. Default is the normal mode, in which the regular doorbell sounds are played. Silent is the night time mode, where you might want to choose a somewhat less noisy sound - like a door knock or something.
Use cron syntax to notify when silent mode starts, and specify the duration in whole hours.
Default mode also have a bell section. If you connect your regular door bell to the relay swith, this setting governs how the door bell will be triggered (one time or multiple times, and for how long each time).
Each button can also contain an override array, with a number of alternate doorbell sounds scheduled for any time of year. These settings will override both silent and default mode settings. Then you can run "Jingle Bells" at Christmas, ghosts and gore on Halloween and fire crackers on new year's eve.
Under the wifi section of the config file, fill in SSID and password for your home network. This must be a 2.4 GHz wireless network with WPA2 security.
The system uses NTP to get correct time.
Your local time zone must be set correctly in the datetime section of the config file.
Look up your time zone in this table and enter the corresponding string value.
In the example configuration, the timezone is set for Norway (with daylight saving time enabled).
You can also choose to use another NTP service by editing the server value under the ntp section.
In addition to playing doorbell sounds, the system can be set up to play custom sound files at any given time. Edit the file to program the schedule.
Use regular cron syntax to describe either a single point in time or a recurring interval.
The current crontab.txt example file is programmed with an hourly chime that will be played between 06 and 22 every day. It also includes a lullaby song that will be played 19:59:20 before weekdays and 20:59:20 before saturdays and sundays.
The crontab.txt file may contain up to 25 valid cron entries.
Edit the mqtt section in the configuration file to enable push notifications for when someone pushes one of the doorbell buttons. You will need access to a MQTT broker for this to work.
MQTT is TLS encrypted, and a CA (root) certificate is required for proper validation. The certificate must be PEM formatted.
In this example mqtt.pem is the certificate from Letsencrypt (R3). You are required to provide a CA root certificate matching the certificate authority for your MQTT broker.
Self-signed certificates for home servers will work fine, as long as you copy a matching root certificate on the SD card. Edit the cert_file property so that it points to the correct certificate.
You can also alter the MQTT topic that the system will use when posting notifications.
Sound assets in this directory are licensed under Creative Commons, Attribution 3.0 Unported.
The example clips are downloaded from freesound.org, and attributions are as follows:
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