ESP8266 Community Forum

- Sat Jun 20, 2015 10:27 pm #21074 Based on the ESP8266EX datasheet (and http://bbs.espressif.com/viewtopic.php?f=6&t=133), the current drain during deep sleep is 10 uA. However, if it is powered off, then the current drain is 0.5 uA. If so, what is the disadvantage of completely powering the ESP8266 off? How long does it take to re-initialize the RTC (which seems to be the only difference between deep sleep and power off)?

I believe it takes about 0.3 - 1s to reconnect to an AP after waking up from deep sleep (also http://bbs.espressif.com/viewtopic.php?f=6&t=133). What about from a power up instead?

- Sat Jun 20, 2015 11:27 pm #21076 Well, one disadvantage to completely powering off the ESP8266 is that you'll need an external device to wake it up.

- Sun Jun 21, 2015 7:37 am #21094 Ah, my apologies, I tend to forget about the most important details at times. I do have another MCU to wake up the ESP. Any idea if there is a difference in connection time between reset and power on though? Or if any of the Espressif folks know the answer?

- Mon Oct 12, 2015 9:40 am #31168 So, finally circling back to this question again, how much time does it take to wake up from deep sleep vs power off? It seems like the datasheet says that it takes 0.3 - 1s to connect to an AP but what about the time taken for it to execute some non-wifi related code (e.g. listen on UART)?

Does Espressif have some table of the wake up times for the various options in the system_deep_sleep_set_option() API?