RTC Sleep Example with a SAMD Board

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1/*
2
3  Sleep RTC Alarm for Arduino Zero
4
5  Demonstrates the use an alarm to wake up an Arduino zero from Standby mode
6
7  This example code is in the public domain
8
9  https://www.arduino.cc/en/Tutorial/SleepRTCAlarm
10
11  created by Arturo Guadalupi
12
13  17 Nov 2015
14
15  modified
16
17  01 Mar 2016
18
19
20
21  NOTE:
22
23  If you use this sketch with a MKR1000 you will see no output on the serial monitor.
24
25  This happens because the USB clock is stopped so it the USB connection is stopped too.
26
27  **To see again the USB port you have to double tap on the reset button!**
28
29*/
30
31#include <RTCZero.h>
32
33/* Create an rtc object */
34
35RTCZero rtc;
36
37/* Change these values to set the current initial time */
38
39const byte seconds = 0;
40
41const byte minutes = 00;
42
43const byte hours = 17;
44
45/* Change these values to set the current initial date */
46
47const byte day = 17;
48
49const byte month = 11;
50
51const byte year = 15;
52
53void setup()
54{
55
56  pinMode(LED_BUILTIN, OUTPUT);
57
58  digitalWrite(LED_BUILTIN, LOW);
59
60  rtc.begin();
61
62  rtc.setTime(hours, minutes, seconds);
63
64  rtc.setDate(day, month, year);
65
66  rtc.setAlarmTime(17, 00, 10);
67
68  rtc.enableAlarm(rtc.MATCH_HHMMSS);
69
70  rtc.attachInterrupt(alarmMatch);
71
72  rtc.standbyMode();
73}
74
75void loop()
76{
77
78  rtc.standbyMode();    // Sleep until next alarm match
79}
80
81void alarmMatch()
82{
83
84  digitalWrite(LED_BUILTIN, HIGH);
85}