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Diffstat (limited to 'watch-library/watch/watch.h')
| -rw-r--r-- | watch-library/watch/watch.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/watch-library/watch/watch.h b/watch-library/watch/watch.h index 8c207ddb..5cd45a6c 100644 --- a/watch-library/watch/watch.h +++ b/watch-library/watch/watch.h @@ -65,4 +65,12 @@ #include "watch_private.h" +/** @brief Returns true when the battery voltage dips below 2.5V. + * @details A CR2016 battery will have a nominal voltage between 2.9 and 3 volts for most of its lifespan. Once the battery + * discharges to about 60%, the voltage will drift slightly lower; this may manifest as a dimmer LED. By the time + * the battery voltage has fallen to 2.5 volts, it will have probably less than 10% of its capacity remaining, and + * you can expect the voltage to drop relatively quickly as the battery dies. + */ +bool watch_is_battery_low(); + #endif /* WATCH_H_ */
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