4 ms·

That looks great, does anyone have one of them? What's the battery life like? The ESP32 isn't very battery-friendly.

• sokoloff 6y ago
  ESP32 in deep sleep modes is reasonably battery friendly (all depending on your frame of reference, of course.) 5uA in RTC-only and 10+ uA in RTC+ULP sleep.
  • StavrosK 6y ago
    That's true, but then you don't get notifications or anything, since it's essentially off.
    • sokoloff 6y ago
      Presumably for a watch use case, you'd plan to deep sleep (ULP) or hibernate (RTC) 98+% of every minute and turn the radios on as infrequently as you could stand to get external notifications. I don't need split-second precision on my notifications if the alternative is a much longer battery life.
      • StavrosK 6y ago
        True, I guess the watch must have some sort of external circuitry that can wake it up every so often.
        • sokoloff 6y ago
          You can use the ESP32 onboard RTC to do periodic wakeups. (You can also use external stimuli via GPIO pins, but you don't need anything extra if all you want is a periodic wakeup.)
          • StavrosK 6y ago
            It has an onboard RTC? Very nice, I missed that (and the ESP8266 didn't have one).