![]() ![]() ![]() In conclusion, we have learned comprehensively about the ESP32s deep sleep mode and wake up sources such as timer, touch pins, and external wake up. In this comprehensive guide, we will look at how to put the ESP32 development board into deep sleep mode. We will use the following function to wake our ESP32 board from deep sleep via ext0 wake up in Arduino IDE: The esp_sleep_enable_ext0_wakeup(GPIO_NUM_X, level) function defines how ext0 wakes up ESP32 from deep sleep. When the user will touch the touch pin (T3), the value on that particular pin will be lower than the threshold value, the ESP32 board wakes up. However, by default, the ESP32 automatically powers down the peripherals that are not needed with the wake up source you define. To see the demonstration of the above code, upload the code to Arduino. Lets wire a cable to GPIO#15 (Touch#3) which will act as the touch wake-up source. */, //Print the wakeup reason for ESP32 and touchpad too, //Setup interrupt on Touch Pad 3 (GPIO15), /* The table below shows the individual active units in ESP32 when it is set in deep sleep. You can check this tutorial: This ESP32 deep sleep article consists of 4 parts: ESP32 core provides five different operating modes as follows: The following table lists which peripherals and units are either active or inactive during different modes. ESP32 supports running a "deep sleep wake stub" when coming out of deep sleep. Keep power domain enabled in sleep mode, if it is needed by one of the wakeup options. What is Deep Sleep in ESP32? After defining the wake up source, you can put the ESP32 in deep sleep: epsleep() Wrapping Up. Now when you press the pushbutton, you will get something similar on the serial monitor. Keep power domain enabled during sleep mode. One terminal of the push button is connected to the 3.3V power supply, and the other terminal is connected to GPIO14, which will sense a change in the logic level when the button is pressed. The first parameter is the RTC GPIO pin that will trigger the wakeup and the second parameter is the state (1 or 0) of that pin. Before entering Light-sleep mode, check if any GPIO pin to be driven is part of the VDD_SDIO power domain. During the first ESP32 boot, the wake-up was not caused by the Deep Sleep but by the "Hard resetting via RTS pin" on the Arduino IDE. It will count how many times ESP32 has woken up from deep sleep. The first is the GPIO pin number and the second is the logic level (LOW or HIGH) by which we want to trigger the wake-up. Next, we need to decide which peripherals power should be cut off. ![]() The ESP32 can be configured to wake from deep sleep using multiple pins. Enable beacon wakeup by WiFi MAC, it will wake up the system into modem state. ![]() There are two external wake up resources available such as an ext0 and ext1. This means that you can wake up the ESP32 by toggling the value of a signal on a pin, like the press of a button. Here the interrupt is attached to touch pad 3 (GPIO15). The pin is configured in esp_deep_sleep_start/esp_light_sleep_start, immediately before entering sleep mode. The solution here is to reduce the ESP32s power usage by taking advantage of Deep Sleep Mode. After a random number of wakes up, the ESP32 goes to sleep and it won't wake up again. First, we will put ESP32 into deep sleep mode and then see how to wake it up using touch sensor pins. ![]()
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