Before writing code, you must add the library to your Arduino Integrated Development Environment (IDE).
#include <VirtuabotixRTC.h>
dataFile = SD.open("datalog.txt", FILE_WRITE); if (dataFile) dataFile.print(myRTC.month); dataFile.print("/"); dataFile.print(myRTC.dayofmonth); dataFile.print(" "); dataFile.print(myRTC.hour); dataFile.print(":"); dataFile.print(myRTC.minute); dataFile.print(" - Temp: "); dataFile.print(temperatureC); dataFile.println(" C"); dataFile.close(); virtuabotixrtc.h arduino library
: Unlike I2C-based RTCs (which use SDA/SCL), this library uses a proprietary 3-wire interface, meaning it can be connected to almost any digital pins on your Arduino. Problem with code for Arduino using an RTC - Programming
This example shows you how to initialize the RTC, set the time (once), and print the time to the Serial Monitor. Before writing code, you must add the library
To use this library, you will need a DS1302 RTC module. Wire it to your Arduino as follows:
Serial.print(myRTC.hours); // Cached values Serial.print(":"); Serial.print(myRTC.minutes); Serial.print(":"); Serial.println(myRTC.seconds); To use this library, you will need a DS1302 RTC module
VirtuabotixRTC myRTC(0x68); // typical I2C address for DS1307
: Manages seconds, minutes, and hours (including 24-hour or AM/PM formats).
By offloading timekeeping to an RTC module and using this library, your Arduino can maintain accurate time even if it loses power, resets, or is busy executing heavy code. Why Use the VirtuabotixRTC Library?
In the world of Arduino projects, keeping accurate time is a foundational requirement for data logging, scheduling, and automation. While Arduino boards have internal clocks, they lose time when powered down or reset. This is where Real-Time Clock (RTC) modules come in—and the library is one of the simplest, most intuitive ways to interface with them.