You can't let the ESP32 be in deep sleep forever. At some point you need to wake it up and the easiest way is by using a timer.

Learn how to configure your board so it will automatically wakeup after a certain periode of time. For instance: you can sleep for 15 minutes, wakeup, make a temperature measurement and go back to deep sleep.

⚡️Other videos in this series:
   • ESP32 + Arduino  

(Everything you need to know about programming the ESP32 by using the Arduino Framework)

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