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Works well (Arduino + adafruit/RTClib), but the PCB has a charge circuit and the included battery is not rechargeable, so leaving the PCB as-is may damage the battery. The battery will last years (in normal "backup" use), so the added expense of a rechargeable battery doesn't make sense. It's still nice to have the circuit there, in case you want to switch to a rechargeable battery. "Disabling" the charge circuit is easy (just cut one trace on the PCB, google which one).
Verified purchase: Yes | Condition: New
Both the clock and memory worked well. You need to be aware that you must use a RECHARGEABLE battery. You can use it with standard CR2032 but you must modify the circuit board which is what I did. Great unit for the price....
Verified purchase: Yes | Condition: New
Using this with Atmel AVR via i2c interface. Great real time clock. The on-board EEPROM is also useful. You'll have to buy the battery separately.
Verified purchase: Yes | Condition: New
Got everything you need especially the battery. Has an led to show 5v power, doesn't drain the battery when 5v is disconnected like other non ds3231 designs/copies on eBay.
Verified purchase: Yes | Condition: New
In a small form factor breakout board, a module with all expected features for arduino projects
Verified purchase: Yes | Condition: New