Hi Steve.
I haven’t experimented with light sleep on ESP32.
I’m not sure if it is implemented on Arduino IDE. There are solutions for light-sleep on ESP-IDF.
Take a look at the following resources that might help:

• https://github.com/espressif/arduino-esp32/issues/475
• https://docs.espressif.com/projects/esp-idf/en/latest/api-reference/system/sleep_modes.html#entering-light-sleep

Regards,
Sara

Yes, I got light sleep to work in Arduino IDE with:
esp_light_sleep_start();
and in Setup I allowed wakeup by time and button press:
esp_sleep_enable_timer_wakeup(SleepSecs * uS_TO_S_FACTOR);
esp_sleep_enable_ext0_wakeup(WAKEPIN,0); //1 = Low to High, 0 = High to Low. Pin pulled HIGH

Hi.
That’s great that you got it working.
And thank you for sharing your solution! It may be helpful for others!
Regards,
Sara

I ran into a problem with LightSleep with only a timer wakeup event.

esp_sleep_enable_timer_wakeup(SleepSecs * uS_TO_S_FACTOR);
esp_light_sleep_start();

returned immediately;  However this worked as expected:

esp_sleep_enable_timer_wakeup(SleepSecs * uS_TO_S_FACTOR);
delay(100);
esp_light_sleep_start();

Regards

Thanks for sharing that! 🙂

Hi everyone,

This discussion inspired me last week, and I have delved a little deeper into the subject to shed some additional light. I’ve written a fairly comprehensive tutorial that should give you a better understanding of how things work:

Experimenting with ESP32 sleep modes

Hopefully you’ll find it useful,
Regards,
Steph