The ESP32’s Deep Sleep Mode
The ESP32 is a powerful microcontroller that is capable of a variety of tasks, from controlling IoT devices to running complex applications. However, one of its most useful features is its ability to enter a low-power deep sleep mode. This mode allows the ESP32 to conserve battery power by reducing its power consumption to a minimum. When in deep sleep, the ESP32 is essentially in a dormant state, with all of its peripherals and functions disabled.
External Wake-Up
The ESP32 can be woken from deep sleep in three different ways. The first is by using an internal timer, which will wake the ESP32 at a predetermined interval. The second is by using the ESP32’s touch pins, which can be used to trigger a wake-up. The third is by using external wake-up, which allows an external input to trigger a wake-up on demand.
Using External Wake-Up (EXT0)
External wake-up is a powerful feature of the ESP32, and it is particularly useful for IoT projects where the ESP32 needs to be woken up only when certain conditions are met. In this video, we will be exploring how to use the EXT0 pin to wake the ESP32 from deep sleep.
EXT0 Pin
The EXT0 pin is one of the two external wake-up pins available on the ESP32. It is located on the ESP32’s GPIO0 pin and is used to detect a low-level signal. When a low-level signal is detected, the ESP32 will wake up from deep sleep.
Code Walkthrough
In order to use the EXT0 pin to wake the ESP32 from deep sleep, we need to write some code. The code will be responsible for setting up the EXT0 pin, putting the ESP32 into deep sleep, and waking it up when a low-level signal is detected. Let’s take a look at the code line by line.
Set Up EXT0 Pin
The first step is to set up the EXT0 pin. This is done by calling the esp_sleep_enable_ext0_wakeup() function, which takes two arguments: the GPIO pin to be used for the EXT0 wake-up and the level of the signal that will trigger the wake-up. In this case, we are using GPIO0 and a low-level signal.
Put ESP32 Into Deep Sleep
Once the EXT0 pin is set up, the ESP32 can be put into deep sleep. This is done by calling the esp_deep_sleep_start() function, which takes no arguments. This will put the ESP32 into a low-power state until it is woken up by an external signal.
Wake Up ESP32
When a low-level signal is detected on the EXT0 pin, the ESP32 will wake up from deep sleep. This is done by calling the esp_deep_sleep_start() function again, which will return the ESP32 to its normal state.
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What is an External Wake-Up?
An external wake-up is a feature of the ESP32 microcontroller that allows it to be woken up from deep sleep by an external signal. This signal can be a low or high voltage on a specific GPIO pin, depending on the configuration. The external wake-up feature is useful for applications where the ESP32 needs to be woken up in response to an external event, such as a button press or sensor reading.
How Does External Wake-Up Work?
When the ESP32 is in deep sleep, it is essentially in a low power state, where all of its internal components are powered down. However, the external wake-up feature allows the ESP32 to remain in this low power state, while still being able to detect an external signal. This signal can be a low or high voltage on a specific GPIO pin, depending on the configuration. When the external signal is detected, the ESP32 will wake up and resume normal operation.
What is EXT0?
EXT0 is the name of the external wake-up feature on the ESP32. It is a Vigilant guard that can be posted next to different GPIO pins on the ESP32. Depending on the development board, the specific pins that can be used with EXT0 may vary. However, they are generally labeled with the RTC GPIO on the pinout diagram. When EXT0 is assigned to one of these pins, it can be configured to look for either a low or high voltage. When the voltage is detected, the ESP32 will wake up and resume normal operation.
ESP32 External Wake-Up
The ESP32 is a powerful microcontroller that can be used for a variety of applications. One of its most useful features is its ability to be put into a deep sleep state and then be woken up on demand. This is known as an external wake-up and is achieved by connecting a momentary push button to a digital pin on the ESP32. When the button is pressed, the ESP32 will wake up and perform a task, such as printing some data to the serial port.
Setting Up the Circuit
To set up the circuit, a momentary push button is connected to a digital pin on the ESP32 breakout board. In this example, digital pin 4 is used. One side of the button is connected to the pin, and the other side is connected to ground.
Writing the Code
The code for this example is available on the ESP32 website. It can be copied and pasted into the Arduino IDE to get up and running. The code sets up the ESP32 to enter deep sleep mode and then wake up when the button is pressed. It then prints some data to the serial port before going back to sleep.
Its going to be high because were pulling it up with this input pull up.
Assigning the Pin Number
The first step in exploring ESP32’s external wake-up in deep sleep is to assign the pin number that will be used for EXT0. This is done by declaring a constant integer, which is set to the desired pin number. In this case, the pin number chosen is four.
Setting the Pin Mode
The next step is to set the pin mode for the wake-up pin. This is done in the setup section of the code, where the pin mode is set to an input pull up. This will pull the voltage of the pin high, meaning that if anyone is measuring the voltage or doing a digital read of the voltage, it will be high due to the input pull up.
Configuring the External Wake-Up
The next step is to configure the external wake-up. This is done with a single line of code, which is relatively simple and straightforward. This line of code will enable the ESP32 to be woken up from deep sleep by an external signal.
Putting the ESP32 into Deep Sleep
The final step is to put the ESP32 into deep sleep. This is done with a few lines of code, which are minimal and easy to understand. This code will put the ESP32 into a low-power state, allowing it to be woken up by an external signal.
Thats what triggers EXT 0 and wakes up our ESP32.
Understanding the ESP32 External Wake-Up
The ESP32 is a powerful microcontroller that is capable of deep sleep. This feature allows the device to enter a low-power state, reducing energy consumption and extending battery life. To wake up from this state, the ESP32 can be configured to use an external wake-up signal. This signal can be triggered by a low voltage or a high voltage, depending on the circuit setup.
The Circuit Setup
The circuit setup is an important factor in determining how the ESP32 will be woken up. In this case, the ESP32 is connected to a momentary push button. One side of the button is connected to pin 4 of the ESP32, while the other side is connected to ground. When the button is not pressed, the voltage is high thanks to an input pull-up. This means that the external wake-up signal (EXT 0) will not be triggered. When the button is pressed, the voltage is pulled down to a low state, which triggers EXT 0 and wakes up the ESP32.
The Code
The code required to enable external wake-up on the ESP32 is relatively straightforward. The key line of code is the ESP sleep enable EXT 0 wake up function. This function takes two parameters: the pin to be assigned to EXT 0, and the state that should trigger the wake up (low voltage or high voltage). In this case, a low voltage is used to trigger the wake up.
Understanding ESP32’s External Wake-Up
The ESP32 is a powerful microcontroller with a wide range of features, including the ability to enter a state of deep sleep. In this state, the ESP32 is essentially powered down and consumes very little energy. However, it can be woken up from this state by an external signal, known as an external wake-up. This is done by setting a pin to a low state, which triggers the ESP32 to wake up.
Setting Up an External Wake-Up
In order to set up an external wake-up, the first step is to define a pin as the external wake-up pin. This is done by using the gpio_num_t enumeration type, which is used to represent the different GPIO pins on the ESP32. This type helps to ensure that only valid GPIO numbers are passed into the function. Once the pin has been set, the next step is to put the ESP32 into deep sleep. This is done by calling the ESP_deep_sleep_start() function.
What Happens When the ESP32 Wakes Up?
When the ESP32 wakes up, it is ready to execute code. This means that the user can program the ESP32 to do whatever they want when it wakes up. This could be anything from reading a sensor to sending an email. The possibilities are endless.
ESP32’s Deep Sleep Mode
The ESP32 is a powerful microcontroller that offers a wide range of features, including a deep sleep mode. This mode allows the ESP32 to enter a low-power state while still being able to wake up at predetermined intervals. This is useful for applications such as battery-powered IoT devices, where power consumption is a critical factor.
External Wake-Up
The ESP32’s deep sleep mode can be triggered by an external wake-up signal. This signal can be generated by a variety of sources, such as a button press, a motion sensor, or a temperature sensor. When the external wake-up signal is detected, the ESP32 will wake up from deep sleep and execute the code that is programmed to run after the wake-up.
RTC Memory
In order to keep track of the number of times the ESP32 has been woken up from deep sleep, the ESP32 has an RTC memory. This memory is used to store data that will persist even after the ESP32 has gone into deep sleep. This allows the ESP32 to keep track of the number of times it has been woken up, and can be used to store other data that needs to be preserved when the ESP32 is in deep sleep.
Boot Count Variable
In order to track the number of times the ESP32 has been woken up from deep sleep, a boot count variable can be used. This variable is stored in the RTC memory, and is incremented each time the ESP32 is woken up from deep sleep. This allows the ESP32 to keep track of how many times it has been woken up, and can be used to trigger different actions depending on the number of times the ESP32 has been woken up.
ESP32’s External Wake-Up in Deep Sleep
The ESP32 is a powerful microcontroller that is capable of entering a low-power state known as deep sleep. This state allows the ESP32 to conserve energy while still being able to perform certain tasks. One of the most useful features of the ESP32 is its ability to be woken up from deep sleep by an external source. This feature is known as external wake-up and can be used to perform tasks such as reading sensor values, sending data to the cloud, or blinking LEDs.
Setup
In order to use the external wake-up feature of the ESP32, certain steps must be taken in the setup phase of the program. First, serial communication must be initiated with the serial begin command. Next, the boot count must be incremented with the boot count++ command. Finally, the current boot number must be printed with the print command. After these steps have been completed, the ESP32 can be put into deep sleep.
Delay
When the ESP32 is put into deep sleep, the code in the loop section of the program will no longer execute. Therefore, any tasks that need to be performed must be done before the ESP32 is put to sleep. To ensure that the ESP32 has enough time to perform these tasks, a delay command should be added to the program. This delay will give the ESP32 time to perform the necessary tasks before entering deep sleep.
External Wake-Up
Once the ESP32 has been put into deep sleep, it can be woken up by an external source. This external source can be a timer, a button press, or an external signal. When the external source is triggered, the ESP32 will wake up and begin executing the code in the loop section of the program. This allows the ESP32 to perform certain tasks while still conserving energy.
ESP32’s External Wake-Up in Deep Sleep
The ESP32 is a powerful microcontroller that can be used to perform a variety of tasks. One of its most useful features is its ability to enter into a deep sleep mode, which allows it to conserve energy while still being able to wake up when needed. This article will explore the ESP32’s external wake-up in deep sleep, and how it can be used to conserve energy and perform tasks efficiently.
The ESP32’s Deep Sleep Mode
The ESP32’s deep sleep mode is a low-power state that can be used to conserve energy while still allowing the microcontroller to wake up when necessary. When in deep sleep mode, the ESP32 will enter a low-power state and will only wake up when an external signal is detected. This signal can be generated by a variety of sources, such as a button press, a timer, or an external sensor.
External Wake-Up in Deep Sleep
When the ESP32 is in deep sleep mode, it can be woken up by an external signal. This signal can be generated by a variety of sources, such as a button press, a timer, or an external sensor. To ensure that the ESP32 only wakes up once, a delay can be used to ensure that the signal is only detected once. This delay can be set to a specific amount of time, allowing the ESP32 to remain in deep sleep mode until the signal is detected.
Using the External Wake-Up in Deep Sleep
The external wake-up in deep sleep can be used to conserve energy and perform tasks efficiently. For example, the ESP32 can be programmed to wake up when a button is pressed, allowing it to perform a specific task without having to remain powered on all the time. This can be used to conserve energy and reduce power consumption.
ESP32’s Deep Sleep
The ESP32 is a powerful microcontroller that is capable of entering a low-power state known as deep sleep. This state is ideal for applications that require long-term battery life, as it drastically reduces the power consumption of the device. When in deep sleep, the ESP32 is essentially powered down, but can be woken up by an external signal. This signal is typically generated by a timer, which can be programmed to wake up the ESP32 at set intervals.
External Wake-Up
The ESP32’s external wake-up feature allows the device to be woken up from deep sleep by an external signal. This signal is typically generated by a timer, which can be programmed to wake up the ESP32 at set intervals. The timer can be set to generate a signal at any frequency, allowing the ESP32 to be woken up at regular intervals. This feature is particularly useful for applications that require long-term battery life, as it allows the ESP32 to remain in a low-power state for extended periods of time.
Advantages of External Wake-Up
The external wake-up feature of the ESP32 offers several advantages over traditional wake-up methods. Firstly, the timer can be set to generate a signal at any frequency, allowing the ESP32 to be woken up at regular intervals. This allows the device to remain in a low-power state for extended periods of time, significantly reducing power consumption. Secondly, the external wake-up feature is more reliable than traditional wake-up methods, as it is not affected by software or hardware errors. Finally, the external wake-up feature is more efficient than traditional wake-up methods, as it does not require the ESP32 to constantly monitor its environment for changes.
The ESP32’s external wake-up feature is a useful tool for applications where the ESP32 needs to be woken up in response to an external event. EXT0 is the name of the external wake-up feature on the ESP32, and it can be assigned to a specific GPIO pin. When configured, EXT0 will look for either a low or high voltage, and when detected, the ESP32 will wake up and resume normal operation.
The ESP32’s external wake-up feature is a powerful tool that can be used to create applications that require the ESP32 to be woken up on demand. By connecting a momentary push button to a digital pin on the ESP32, the microcontroller can be put into a deep sleep state and then be woken up when the button is pressed. The code for this example is available on the ESP32 website and can be easily copied and pasted into the Arduino IDE.
By following these steps, it is possible to explore ESP32’s external wake-up in deep sleep. This process is relatively simple and straightforward, requiring only a few lines of code. This makes it easy for anyone to explore this feature of the ESP32, allowing them to take advantage of its low-power capabilities.
The ESP32’s external wake-up feature is a powerful tool for reducing energy consumption and extending battery life. By understanding the circuit setup and the code required to enable external wake-up, developers can take advantage of this feature to create more efficient applications.
The ESP32’s external wake-up feature is a powerful tool that can be used to create low-power applications. By setting up an external wake-up pin, the ESP32 can be put into a deep sleep state and then woken up by an external signal. Once the ESP32 is awake, it can be programmed to do whatever the user desires.
The ESP32’s deep sleep mode and external wake-up signal allow for low-power applications that can still be woken up at predetermined intervals. The RTC memory allows the ESP32 to store data that will persist even after the ESP32 has gone into deep sleep, and the boot count variable can be used to track the number of times the ESP32 has been woken up. This allows for more sophisticated applications that can react differently depending on the number of times the ESP32 has been woken up.
The ESP32’s external wake-up feature is a powerful tool that allows the microcontroller to conserve energy while still being able to perform certain tasks. By following the steps outlined in this article, users can easily take advantage of this feature and use it to create powerful and efficient applications.
The ESP32’s external wake-up in deep sleep is a powerful feature that can be used to conserve energy and perform tasks efficiently. By using a delay, the ESP32 can be programmed to only wake up once when an external signal is detected, allowing it to remain in deep sleep mode until the signal is detected. This can be used to conserve energy and reduce power consumption, making the ESP32 an ideal choice for applications that require low power consumption.
The ESP32’s external wake-up feature is a powerful tool for applications that require long-term battery life. By allowing the device to remain in a low-power state for extended periods of time, the external wake-up feature significantly reduces power consumption. Furthermore, the external wake-up feature is more reliable and efficient than traditional wake-up methods, making it an ideal solution for applications that require long-term battery life.