RTC GPIO
The RTC GPIOs are part of the RTC (Real-Time Clock) controller and remain active even when the main CPU is in deep sleep. This allows…
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Memory in Hibernation
RTC memory cannot be used in Hibernation Mode, but data can be saved persistently using flash storage. Which One to Use? Feature RTC Memory (RTC_DATA_ATTR)…
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Memory in Deep Sleep
RTC (Real-Time Clock) memory is a small portion of memory in the ESP32 that remains powered during deep sleep. It allows data retention while keeping…
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ULP Wake-Up
The ULP (Ultra-Low-Power Coprocessor) coprocessor is a specialized processor built into the ESP32 to handle tasks while the main CPU is in deep sleep or…
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Touchpad Wake-Up
Here’s how you can wake up the ESP32 from deep sleep using Touchpad T3: ESP32 Deep Sleep Wake-Up via Touchpad T3 **How It Works Since…
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External GPIO Wake-Up
This example uses GPIO12 as the external wake-up source. How It Works Additional Notes Since RTC memory is not used and an external GPIO is…
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Timer Wake-Up
Since RTC memory is not used, the ESP32 enters Hibernation Mode, consuming only ~5µA.
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Hibernation Mode
Hibernation mode is the lowest power state available on the ESP32. It is similar to deep sleep but with even lower power consumption, making it…
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Deep Sleep Mode
The ESP32 has multiple power-saving modes, and deep sleep is one of the most effective for reducing power consumption. In deep sleep, most of the…