Standard examples often use the following pin configuration: SCLK (Clock) I/O (Data) : 5V or 3.3V (depending on module) Installation Guide
The VirtuabotixRTC library is a lightweight, easy-to-use software library designed specifically for the Arduino IDE. It provides a simple set of commands to communicate with RTC chips. virtuabotixrtch arduino library
Your RTC module’s battery is not connected, or the module does not have a battery holder. Fix: Most cheap modules have a diode that prevents charging. Ensure a 3V coin cell is installed. Standard examples often use the following pin configuration: