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