ESP 32 cam, deep sleep wake up every 24 hours, or every week.

Q&A Forum › Category: ESP32 › ESP 32 cam, deep sleep wake up every 24 hours, or every week.

I would like ESP32 cam to wake up one time per day, or one time per week. How can I do that?
I follow wake up timer example, and it works up until around 3600 sec, it start to keep waking up every 1 sec.
I don’t know why? Perhaps the number is too large for esp_sleep_enable_timer_wakeup function?

esp_err_tesp_sleep_enable_timer_wakeup(uint64_t time_in_us)
https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/sleep_modes.html

I check this web site, uint64 should give really really large number. but why I can’t even wakeup
every 3600 sec?

Question Tags: Deep sleep, ESP32-Cam, uint64

1 Answers

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Best Answer

Steve Mercer answered 5 years ago

What number are you passing to the function? Note that it wants micro seconds so you need to multiply your seconds by 1 million. ie. 3600 seconds would be 3,600,000,000 us.

Also note that the built-in RTC is completely inaccurate. You would be better off using an external RTC and wake up the ESP32 with an interrupt.