// COMMENT THIS LINE AFTER FIRST USE // Only uncomment to set the time to when this sketch is compiled // myRTC.setTime(0, 15, 10, 4, 17, 10, 24);
Note: For heavy timestamp math, consider switching to RTClib. On tiny chips without hardware I2C, you can use any two digital pins: virtuabotixrtch arduino library
void loop() // 1. Read the current time from the chip myRTC.updateTime(); // COMMENT THIS LINE AFTER FIRST USE //
If you need absolute seconds since 1970, you can extend the library: The Arduino’s internal clock (millis() or delay()) is
Introduction In the world of embedded electronics and DIY projects, keeping accurate time is a surprisingly difficult challenge. The Arduino’s internal clock (millis() or delay()) is notoriously inaccurate for long-term projects, drifting by several seconds per day. To solve this, makers turn to Real-Time Clock (RTC) modules. Among the most popular and affordable of these is the DS1307 or DS3231 chip, typically found on a breakout board with a coin cell battery. However, navigating the code to interface with these chips can be tricky. That’s where the VirtuabotixRTC Arduino Library comes in.
Whether you are logging soil moisture every hour, controlling a night light based on sunset, or building the world’s most over-engineered alarm clock, the DS1307/DS3231 paired with VirtuabotixRTC is the workhorse solution you need.