Software: implement alarms

[makers-for-life]

Software: implement alarms

[dsferruzza]

I'll try to sum up my understanding.

Alarms have:

• a trigger predicate: it can depend on various parameters, and may need an internal counter of the number of cycles in a row the predicate was true along with a threshold that will raise an alarm when exceeded
• an error code (unique)
• a severity: low, medium, high

When an alarm is triggered it has effects depending on its severity:

• buzzer (already implemented)
• LEDs
• display error codes on the third line of the LCD screen (using horizontal auto-scrolling?)

When several alarms are triggered at the same time, only the alarms of the higher triggered severity have effects.

If a user press the alarm OFF button, it snoozes the buzzer for 2 minutes. If an alarm of higher severity is then triggered, snoozing is interrupted and buzzer rings.

If an alarm's predicate becomes false, it is not to be considered active anymore. Effects can continue to happen according to the higher severity of the remaining active alarms, or stop if there are no remaining active alarms.

---

I believe we need some kind of alarm controller (singleton?) that could:

• be called if the predicate of an alarm is true (this might trigger effects)
• be called if the predicate of an alarm is false (this might stop effects)

It would then keep track and handle:

• inner state of alarms (number of cycles in a row it was triggered)
• active alarms
• snooze status (if snoozed, we need to keep track of the timing and the severity that was snoozed)
• LEDs effects
• LCD display

[RomainBlanc]

When an alarm is triggered, the alarms number will be displayed on the third line of the screen:

[RomainBlanc]

French version

[Mefl]

due to #120, we need to store the cycle number for each alarm triggered to be able to send the new alarms (ie triggered in the last complete cycle)

[hbs]

Alarms should trigger telemetry events, so should the user actions.

And any parameter involved in an alarm should also be reported via the telemetry.