first commit

libraries/RTCLib_by_NeiroN/examples/ds3231/ds3231.ino

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+// Example for DS3231 module connected via I2C interface
+
+#include <RTClib.h>
+
+DS3231 rtc;
+
+// buffer for DateTime.tostr
+char buf[20];
+
+void setup() {
+  Serial.begin(9600);
+#ifdef AVR
+  Wire.begin();
+#else
+  Wire1.begin(); // Shield I2C pins connect to alt I2C bus on Arduino Due
+#endif
+  rtc.begin();
+
+  if (!rtc.isrunning()) {
+    Serial.println("RTC is NOT running!");
+    // following line sets the RTC to the date & time this sketch was compiled
+    rtc.adjust(DateTime(__DATE__, __TIME__));
+  }
+}
+
+void loop() {
+  DateTime now = rtc.now();
+
+  Serial.println(now.tostr(buf));
+
+  Serial.print(" since midnight 1970/1/1 = ");
+  Serial.print(now.unixtime());
+  Serial.print("s = ");
+  Serial.print(now.unixtime() / 86400L);
+  Serial.println("d");
+
+  // calculate a date which is 7 days and 30 seconds into the future
+  DateTime future(now + (7 * 86400L + 30));
+
+  Serial.print(" now + 7d + 30s: ");
+  Serial.println(future.tostr(buf));
+
+  // calculate a date which is 30 days before
+  DateTime past(now - 30 * 86400L);
+
+  Serial.print(" now - 30d: ");
+  Serial.println(past.tostr(buf));
+
+  Serial.println();
+  delay(3000);
+}