Wiring
Check pinout, power supply, common GND and voltage levels before connecting the module.
Full code
#include <esp_sleep.h>
void setup() {
Serial.begin(115200);
esp_sleep_enable_timer_wakeup(10ULL * 1000000ULL);
esp_deep_sleep_start();
}
void loop() {}How it works
This lesson matches the page title and gives a clean starting point for this exact example.
Common mistakes
Check board selection, wiring, libraries, power supply and serial monitor baud rate.