Pin 19

gistfile1.txt

#include <esp_sleep.h>

// Define the pin connected to the V_USB signal
#define WAKEUP_PIN GPIO_NUM_19

void printWakeupReason() {
    esp_sleep_wakeup_cause_t wakeup_reason = esp_sleep_get_wakeup_cause();
    
    switch (wakeup_reason) {
        case ESP_SLEEP_WAKEUP_EXT0:
            Serial.println("Wakeup caused by external signal using RTC_IO");
            break;
        case ESP_SLEEP_WAKEUP_EXT1:
            Serial.println("Wakeup caused by external signal using RTC_CNTL");
            break;
        case ESP_SLEEP_WAKEUP_TIMER:
            Serial.println("Wakeup caused by timer");
            break;
        case ESP_SLEEP_WAKEUP_TOUCHPAD:
            Serial.println("Wakeup caused by touchpad");
            break;
        case ESP_SLEEP_WAKEUP_ULP:
            Serial.println("Wakeup caused by ULP program");
            break;
        default:
            Serial.printf("Wakeup was not caused by deep sleep: %d\n", wakeup_reason);
            break;
    }
}

void setup() {
    // Initialize Serial communication for debugging
    Serial.begin(115200);
    delay(1000); // Give time for the serial monitor to start

    // Print a message to indicate that the ESP32 is awake
    Serial.println("ESP32 is awake");

    // Configure the wakeup pin
    pinMode(WAKEUP_PIN, INPUT);

    // Read and print the initial state of the wakeup pin
    int pinState = digitalRead(WAKEUP_PIN);
    int analogPinState = analogRead(WAKEUP_PIN);
    Serial.print("Initial digital state of pin 19 (V_USB): ");
    Serial.println(pinState);
    Serial.print("Initial analog state of pin 19 (V_USB): ");
    Serial.println(analogPinState);

    // Enable wakeup on pin 19 for a LOW -> HIGH change (assuming V_USB goes high when USB is plugged in)
    esp_sleep_enable_ext0_wakeup(WAKEUP_PIN, 1); // 1 for HIGH level, 0 for LOW level

    // Print a message indicating that the ESP32 is going to sleep
    Serial.println("Going to deep sleep now");

    // Delay to allow the message to be printed before going to sleep
    delay(1000);

    // Start deep sleep
    esp_deep_sleep_start();
}

void loop() {
    // This part of the code will be executed when the ESP32 wakes up

    // Print the wakeup reason
    printWakeupReason();

    // Read and print the state of the wakeup pin after wakeup
    int pinState = digitalRead(WAKEUP_PIN);
    int analogPinState = analogRead(WAKEUP_PIN);
    Serial.print("State of pin 19 (V_USB) after wakeup: ");
    Serial.println(pinState);
    Serial.print("Analog state of pin 19 (V_USB) after wakeup: ");
    Serial.println(analogPinState);

    // Go back to sleep
    Serial.println("Going back to deep sleep");
    delay(1000);
    esp_deep_sleep_start();
}