Clock, alarm & calendar

Three apps share the “watch” carousel slots: Clock, Alarm (opened from the Clock) and Calendar.

Clock

Two switchable watch faces — digital and analog. A small bell icon in the header lights up when an alarm is armed.

Open: push Left / Right until you land on the Clock screen.

Key	Action
Up / Down	Toggle digital ↔ analog face
Execute / Fire	Enter the alarm editor (slot 0)
Left / Right	Next / previous carousel screen

Setting the time

The badge has no backup battery for its real-time clock, so the wall clock resets to None on every boot and reads “Clock not set” until you set it. Two ways:

MeshCore app over Bluetooth — the phone pushes its time. The easy path.
Mesh time advert — stand near a synced LoRa repeater and the badge picks the time up over the air.

Set the timezone once under Main → Settings → Timezone — it persists across reboots (default +2, CEST for BornHack).

No seconds hand

A BLE-set time overrides on-air refinement until the next reboot. There is no seconds hand — e-paper refresh is too slow for one.

Alarm

Push Execute / Fire on the Clock screen to open the alarm editor.

Key	Action
Up / Down	Move between fields (Hour → Minute → Days → Tone → Enabled)
Execute / Fire	Drill into / out of a field’s edit mode
Cancel	Exit back to the watch face

The Days field cycles: Daily · Weekdays · Weekends · None · Custom. The Tone field offers ten built-in tunes: Beep, Imperial March, Rickroll, Pink Panther, Sandstorm, Startup, Trololo, Daisy Bell, Nokia, Samsung.

When an alarm fires the buzzer plays the chosen tone up to five times, 8 seconds apart. Any button press silences it; if you ignore it, it stops itself after about 32 seconds.

Set the clock first

Alarms only fire when the clock is set. After a reboot, if you haven’t paired or heard a time advert, the alarm won’t go off — pair first.

Calendar

A month grid with a per-day timeline of imported iCalendar events.

Open: Left / Right to the Calendar screen (right of Clock). The grid is shown without a cursor; push Execute / Fire to enter active mode.

Active mode:

Key	Action
Up / Down	Move the cursor ±7 days (jump a week)
Left / Right	Move the cursor ±1 day
Execute / Fire	Open the day-detail timeline
Cancel	Back to the passive view

Day detail (timeline):

Key	Action
Up / Down	Scroll ±1 hour
Left / Right	Scroll long event titles horizontally
Execute / Fire	Full day-list (all events as a list)
Cancel	Back to the month view

Loading events

The badge imports events at boot from a file named ALARMS.ICS in the root of the USB drive:

Plug the USB-C cable into your computer.
Open the drive labelled CYBR<4 hex>.
Drop your .ics file in the root, renamed to ALARMS.ICS.
Eject the drive.
Reboot the badge (unplug USB or reset).

You can use the official BornHack programme .ics straight from https://bornhack.dk/.

Limits

Up to 31 events are stored. Multi-day events are clamped to end at 23:59 on their start day (e-paper doesn’t draw events spanning days). All events are RAM-only and re-imported on every boot from ALARMS.ICS.