Virtuabotixrtch — Arduino Library

#include <VirtuabotixRTC.h> // Pin definition for Uno/Nano // (SDA, SCL) VirtuabotixRTC myRTC(A4, A5); This is your most important function. It reads the current time from the RTC chip and stores it in the myRTC object's variables.

lcd.setCursor(0, 1); lcd.print("Date: "); if(myRTC.dayofmonth < 10) lcd.print("0"); lcd.print(myRTC.dayofmonth); lcd.print("/"); if(myRTC.month < 10) lcd.print("0"); lcd.print(myRTC.month); lcd.print("/20"); lcd.print(myRTC.year);

If you need absolute seconds since 1970, you can extend the library:

void loop() // 1. Read the current time from the chip myRTC.updateTime();

The VirtuabotixRTC library, originally created by the hardware manufacturer Virtuabotix, is a lightweight, simple-to-use library designed specifically for the DS1307 and DS3231 RTC chips over I2C communication. Whether you are building a data logger, an automated garden irrigation system, or a digital clock, this library provides the essential functions without the bloat of more complex timestamp libraries.

void setup() // Wake up Wire.begin(); myRTC.updateTime(); Serial.println(myRTC.minutes); // Enter deep sleep for 1 minute ESP.deepSleep(60e6);

// 2. Print to Serial Monitor Serial.print(myRTC.hours); Serial.print(":"); Serial.print(myRTC.minutes); Serial.print(":"); Serial.println(myRTC.seconds);

int sundayBased = (myRTC.dayofweek % 7) + 1; Using with Deep Sleep (ESP8266/Arduino) If you are building a battery-powered logger, you cannot call updateTime() every second. Instead, wake up the microcontroller, update once, read the time, log data, and go back to sleep. The RTC keeps running on its own battery.