ESP32 Thing Plus

Other
1

Hi all,
trying to set up deep sleep ext1 but on the Sparkfun hook up page it does not give the RTC pins on the diagram. Guide is very basic and would expect more details on it

thanks peeps

2

That’s covered in the esp32 datasheet

But, here’s some stuff to note:

  1. The ESP32 Thing Plus uses the ESP32 WROOM module, which has RTC GPIOs that can be used for ext1 wake-up.
  2. For ext1 wake-up, you can use multiple RTC GPIOs. On the ESP32, the following pins can be used as RTC GPIOs: 0, 2, 4, 12-15, 25-27, 32-39.
  3. To use ext1 wake-up, you need to:
  • Configure the desired RTC GPIOs
  • Enable ext1 as a wake-up source
  • Set the wake-up mode (ALL_LOW or ANY_HIGH)
  • Put the ESP32 into deep sleep
  1. Here’s a basic code example for using ext1 wake-up:
#include <esp_sleep.h>

void setup() {
  Serial.begin(115200);
  
  // Configure RTC GPIO (e.g., GPIO39 and GPIO36) as wake-up sources
  esp_sleep_enable_ext1_wakeup(((uint64_t)1 << 39) | ((uint64_t)1 << 36), ESP_EXT1_WAKEUP_ANY_HIGH);
  
  Serial.println("Going to sleep now");
  esp_deep_sleep_start();
}

void loop() {
  // This will never be reached
}

This example uses GPIO 36 and 39 as wake-up pins.

  1. The SparkFun ESP32 Thing Plus board may not explicitly label which pins are RTC GPIOs, but you can refer to the ESP32 datasheet or pinout diagrams to identify them.

  2. When using ext1 wake-up, remember that only RTC peripherals are powered during deep sleep, so you may need to reinitialize other peripherals after waking up