Arduino - SimpleRTCAlarm
Simple RTC Alarm
This example demonstrate how to use the RTC library methods in order to do something when an alarm is matched. In particular in this example, the RTC time is set at 16:00:00 and an alarm at 16:00:10. When the time match using the match type MATCH_HHMMSS is reached, the attached interrupt function will print on the serial monitor Alarm Match!.
Hardware Required
- Arduino Zero or MKRZero or MKR1000
Circuit
Only your Arduino Board is needed for this example.
image developed using Fritzing. For more circuit examples, see the Fritzing project page
Code
/*
Simple RTC Alarm for Arduino Zero and MKR1000
Demonstrates how to set an RTC alarm for the Arduino Zero and MKR1000
This example code is in the public domain
http://arduino.cc/en/Tutorial/SimpleRTCAlarm
created by Arturo Guadalupi <a.guadalupi@arduino.cc>
25 Sept 2015
modified
21 Oct 2015
*/
#include <RTCZero.h>
/* Create an rtc object */
RTCZero rtc;
/* Change these values to set the current initial time */
const byte seconds = 0;
const byte minutes = 0;
const byte hours = 16;
/* Change these values to set the current initial date */
const byte day = 25;
const byte month = 9;
const byte year = 15;
void setup()
{
Serial.begin(9600);
rtc.begin(); // initialize RTC 24H format
rtc.setTime(hours, minutes, seconds);
rtc.setDate(day, month, year);
rtc.setAlarmTime(16, 0, 10);
rtc.enableAlarm(rtc.MATCH_HHMMSS);
rtc.attachInterrupt(alarmMatch);
}
void loop()
{
}
void alarmMatch()
{
Serial.println("Alarm Match!");
}