Waveshare Precision RTC Module for Raspberry Pi Pico, Onboard DS3231 Chip

A Pico has no built-in way to keep track of real-world date and time across a power cycle - without an RTC, it starts from zero every time it boots, which is a problem for any project that needs to log events with real timestamps or trigger actions at specific times of day. The DS3231 chip at the heart of this module is specifically known for its temperature-compensated crystal oscillator, holding tighter long-term accuracy than a basic RTC chip as ambient temperature varies. Paired with a backup battery, it keeps correct time through power loss, making it a reliable choice for data-logging or scheduling projects on the Pico platform.