Wiring
Check pinout, power supply, common GND and voltage levels before connecting the module.
Full code
#include <Wire.h>
#include "RTClib.h"
RTC_DS3231 rtc;
void setup() {
Serial.begin(9600);
rtc.begin();
}
void loop() {
DateTime now = rtc.now();
Serial.println(now.timestamp());
delay(1000);
}How it works
This lesson matches the page title and gives a clean starting point for this exact example.
Common mistakes
Check board selection, wiring, libraries, power supply and serial monitor baud rate.