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libraries/Adafruit_SleepyDog_Library/examples/Sleep/Sleep.ino

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+// Adafruit Watchdog Library Sleep Example
+//
+// Simple example of how to do low power sleep with the watchdog timer.
+//
+// Author: Tony DiCola
+
+#ifdef USE_TINYUSB
+#include <Adafruit_TinyUSB.h>  // Include TinyUSB Serial port
+#endif
+
+#include <Adafruit_SleepyDog.h>
+
+void setup() {
+  // For boards with "native" USB support (e.g. not using an FTDI chip or
+  // similar serial bridge), Serial connection may be lost on sleep/wake,
+  // and you might not see the "I'm awake" messages. Use the onboard LED
+  // as an alternate indicator -- the code turns it on when awake, off
+  // before going to sleep.
+  pinMode(LED_BUILTIN, OUTPUT);
+  digitalWrite(LED_BUILTIN, HIGH); // Show we're awake
+
+  Serial.begin(115200);
+  while(!Serial); // wait for Arduino Serial Monitor (native USB boards)
+  Serial.println("Adafruit Watchdog Library Sleep Demo!");
+  Serial.println();
+}
+
+void loop() {
+  Serial.println("Going to sleep in one second...");
+  delay(1000);
+  
+  // To enter low power sleep mode call Watchdog.sleep() like below
+  // and the watchdog will allow low power sleep for as long as possible.
+  // The actual amount of time spent in sleep will be returned (in 
+  // milliseconds).
+  digitalWrite(LED_BUILTIN, LOW); // Show we're asleep
+  int sleepMS = Watchdog.sleep();
+
+  // Alternatively you can provide a millisecond value to specify
+  // how long you'd like the chip to sleep, but the hardware only
+  // supports a limited range of values so the actual sleep time might
+  // be smaller.  The time spent in sleep will be returned (in
+  // milliseconds).
+  // int sleepMS = Watchdog.sleep(1000);  // Sleep for up to 1 second.
+
+  // Code resumes here on wake.
+
+  digitalWrite(LED_BUILTIN, HIGH); // Show we're awake again
+
+  // Try to reattach USB connection on "native USB" boards (connection is
+  // lost on sleep). Host will also need to reattach to the Serial monitor.
+  // Seems not entirely reliable, hence the LED indicator fallback.
+#if defined(USBCON) && !defined(USE_TINYUSB)
+  USBDevice.attach();
+#endif
+
+  Serial.print("I'm awake now! I slept for ");
+  Serial.print(sleepMS, DEC);
+  Serial.println(" milliseconds.");
+  Serial.println();
+}