ESP8266 Community Forum

- Sun Sep 29, 2019 3:26 pm #83974 I am searching for a way to get the amount of time a deepsleep has taken ?
The ESP should NOT connect to WiFi for this purpose . (Battery)
Like this: Wake up by trigger -> check the lenght of the deepsleep

- Mon Sep 30, 2019 5:39 am #83980 You tell the ESP how long a deep sleep should be, so you already know the time spawn.
But if you want an exact value, you could use a real time clock like the DS3231.

Pseudo code:

• Get current date/time
• Write to EEPROM
• Go to deep sleep
• ...
• Wake up
• Get current date/time
• Retrieve stored date/time from EEPROM
• Subtract the two values: result is actual time spawn

Assumption is the mother of all f*ckups. At least: that's what I'm assuming.

- Mon Sep 30, 2019 7:20 am #83981 Thanx for your answer. If the deepsleep lasts a fixed time you are right.
In my case the ESP wakes up form a motion of a PIR sensor not the fixed entered value.
To avoid the energy cost for WiFi / MQTT on every motion I wanted to measure deepsleep time and use this information to just connect every 5 minues or so.

Code: Select allPseudo code:
    Get current date/time
    Write to EEPROM
    Go to deep sleep
    ...
    Wake up
    Get current date/time  // Get it from where if no WiFi connection ?
    Retrieve stored date/time from EEPROM
    Subtract the two values: result is actual time spawn