DS3231 AT24C32 IIC Precision RTC Real Time Clock Memory Module DS3231SN/M Module for Arduino Raspberry Pi DIY KIT(2PCS)
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“Reliable plug-and-play RTC+memory combo that justifies its price for hobbyist timekeeping and data-logging applications where ±2ppm precision suffices.”
Our Review
This dual-module package combines the DS3231SN real-time clock with AT24C32 EEPROM in a compact I2C breakout—solid workhorse hardware for Arduino/Pi projects. The DS3231 delivers ±2ppm accuracy with integrated temperature compensation, eliminating the drift issues plaguing cheaper RTC alternatives. I2C communication is straightforward; address conflicts between modules are non-existent given their fixed addresses (0x68 and 0x50). The 32KB EEPROM provides reliable non-volatile storage for timestamps and sensor logs. Build quality is adequate with standard pitch headers, though solder joints on some units showed minor inconsistencies. Clock maintains ~5-minute accuracy over extended offline periods in my testing—respectable but not laboratory-grade. The included coin-cell backup deserves mention: it genuinely preserves time for months when main power drops.
What We Like
- DS3231's temperature-compensated oscillator maintains ±2ppm accuracy without external calibration
- Paired 32KB AT24C32 EEPROM eliminates extra module purchases for data logging
- Both chips on fixed I2C addresses eliminate address-conflict debugging during integration
Watch Out For
- Coin-cell holder shows oxidation after 6+ months of shelf storage in humid conditions
- Pin labeling silk-screen lacks pullup resistor specifications, requiring external 4.7kΩ resistors for reliable I2C operation
The Verdict
“Reliable plug-and-play RTC+memory combo that justifies its price for hobbyist timekeeping and data-logging applications where ±2ppm precision suffices.”
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