2PCS DS3231 AT24C32 IIC RTC Module Clock Timer Memory Module Beats Replace DS1307 I2C RTC Board with Male to Female Jumper Wire Cable

I have one of these connected to an Arduino Nano knock-off. It's working well. Look up the resistor and diode connection on these boards to the coin cell battery. I used a regular CR2032 cell which is not rechargeable so I removed the resistor which would provide board 5V to it. Not at all a complaint, I have no problems with the one I'm using, just a concern (with, apparently, any of this type of board) about applying charging voltage to a cell which is not designed to be rechargeable. I would buy more of these.

El Dorhea 4 unids DS3231 es un módulo de reloj en tiempo real (RTC) de alta precisión, ideal para proyectos con Raspberry Pi y Arduino. Este módulo permite mantener la fecha y hora incluso cuando el sistema está apagado, gracias a su batería de respaldo.Características principales:- Voltaje de operación: 3.3V - 5V.- Interfaz de comunicación: I2C.- Alta precisión, con compensación de temperatura.- Memoria EEPROM integrada (AT24C32) para almacenamiento de datos.- Dos alarmas programables y formato de hora configurable (12/24 horas).Este módulo es perfecto para aplicaciones de registro de eventos, automatización y sistemas de monitoreo.

These RTC Modules were pretty easy to setup, although they came with no instruction. After some googling i found instructions and was off to the races! I do wish it was a different battery style as the batteries dont seem to be intended to be replaced, although it seems easy enough to do so.

Only needed one but this was a good buy for two. No regrets. Modules are well packed and come with a pack of nice male to female pigtails that will be very handy with a bread board. Pleased about my purchase.

The modules all worked fine but no useful documentation provided.I think there is a temperature sensor on board but no information on how to access it.

Muy bien empacados funcionan muy bien

About 15 minutes of setup, it's working so far. Can't vouch for the battery however.

Another review noted that the battery isn’t re-charchable and the board does have a charging circuit. That’s true however the charging circuit doesnt do anything with a 3.3V supply so it’s safe to use with this battery. If you use a 5V supply then replace with a re-charchable or remove the resistor.