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Rosalie B. The DS3234 RTC breakout gets the job done if you need accurate timekeeping over SPI instead of I2C. The TCXO keeps time really well, and having the extra SRAM for persistent data is a nice touch on a breadboard-friendly board. However, it's worth noting that the CR2032 battery isn't included, so you'll need to source one separately before using the backup feature. Also, 4-wire SPI takes up quite a few GPIO pins on smaller microcontrollers. It's a decent, functional board, but nothing mind-blowing.
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Dano O. Izvanredan RTC modul! Zbog TCXO-a je izuzetno precizan, a SPI sučelje bilo mi je spas jer mi je I2C već bio pretrpan. Savršeno radi na prototipnoj pločici.