Download the library source files (usually a .zip archive from GitHub or an Arduino community forum). Open your Arduino IDE.
Allowing you to assign any three digital pins on your Arduino to handle the communication.
: If you manually manipulate registers without conversion, or if you mix methods, you may write invalid BCD values (e.g., 0x1A for seconds, where A is invalid). The library does not validate register writes beyond basic bounds. virtuabotixrtc.h arduino library
// Check if current time matches alarm time if (!alarmTriggered && myRTC.hours == alarmHour && myRTC.minutes == alarmMinute && myRTC.seconds == 0)
| Feature | VirtuabotixRTC.h | RTClib (Adafruit) | | :--- | :--- | :--- | | | DS1302 | DS1307, DS3231 | | Interface | 3-wire (Digital pins) | I2C (SDA/SCL) | | Ease of Use | Very simple | More features, steeper curve | | Code Size | Small | Larger | | Precision | Low (±20ppm) | High (DS3231: ±2ppm) | | Best For | Simple clocks, DS1302 modules | Professional logging, DS3231 | Download the library source files (usually a
: RAM addresses 0–30 are valid. Address 31 is the trickle charger register, which the library does not natively expose but can be accessed via writeRegister(0x90 | 0x01, value) . The trickle charger is essential for supercapacitor-backed RTCs.
If you are following a specific tutorial that uses this library, it works perfectly fine for basic timekeeping. However, for new projects, many experts recommend moving to the RTClib by NeiroN RtcDS1302 by Makuna : If you manually manipulate registers without conversion,
ArduinoRTClibrary/virtuabotixRTC. h at master · chrisfryer78/ArduinoRTClibrary · GitHub. virtuabotixRTC_version1.ino - GitHub
An Arduino cannot keep accurate time on its own using basic functions like delay() or millis() . These functions track relative time since the board powered on and drift significantly over hours or days. Furthermore, if power is disconnected, the time resets completely.
Providing clean, readable functions to set and read the time.