Adafruit PCF8523 Real Time Clock Assembled Breakout Board

This battery-backed real time clock (RTC) ensures your microcontroller project accurately tracks time, even during power interruptions or reprogramming. It's an ideal choice for datalogging, clock-building, time stamping, timers, and alarms.

Featuring the PCF8523 RTC, it operates with both 3.3V and 5V power and logic. Compatible with Arduino, CircuitPython, or Raspberry Pi, this module includes a PCB and header for seamless integration with any breadboard or wired installation. Two mounting holes offer easy setup.

Reliable timekeeping is assured for over 5 years with a CR1220 coin cell battery, which is not included. While the PCF8523 is cost-effective, its precision may vary up to 2 seconds a day. For greater accuracy, consider the DS3231 precision RTC.

Our comprehensive guide provides valuable resources such as code libraries, schematics, and more to get you started effortlessly.