A simple sketch to test the D1M SLOG (SLeep + watchdOG) deep sleep function. Ensure both jumpers are set to the outer position (connecting D0 to RST).

d1m_slog_test_deep_sleep.ino

// during wake prints 3 lines to console only
// then sleep 10 seconds, then repeat...

const int sleepSeconds = 10;

void setup() {
  Serial.begin(115200);
  Serial.println("\n\nWake up");
  // Connect D0 to RST to wake up
  pinMode(D0, WAKEUP_PULLUP);
}

void loop() {
  Serial.println("loop point 1");
  delay(1000);
  Serial.println("loop point 2");
  delay(1000);
  Serial.println("loop point 3");
  delay(1000);
  Serial.printf("Sleep for %d seconds\n\n", sleepSeconds);
  // convert to microseconds
  ESP.deepSleep(sleepSeconds * 1000000);
}