Posted by a reviewer on Amazon

As another movie fan wrote the documentation is somewhat lacking

Posted by a reviewer on Amazon

But after looking over the document provided by the seller it looks like the rtc chip is compatible with the ds1307

Posted by a reviewer on Amazon

Adafruits sells a ds1307 module that is larger and designed for a breadboard

Posted by a reviewer on Amazon

The instructions can be found here

Posted by a reviewer on Amazon

This little rtc module is tiny but is super accurate compared to most pc clocks thanks to its use of the ds3231 rtc chip mine keeps time within a few seconds per monthnow the bad news i would have rated the sunfounder ds3231 rtc real time clock module a solid 5 out of 5 but the software support for installation of the module on the raspberry pi could be a bit better

Posted by a reviewer on Amazon

From the raspberry pi foundation web site does not have support for a hardware clock of any kind enabled by default because the pi hardware doesnt have a built in rtc chipso you need to update your system configuration to enable the clock and unfortunately this module doesnt come with a simple oneclick type installer script

Posted by a reviewer on Amazon

To install from the provided instructions you have to understand how to edit your system files and run several commands from a terminal as root

Posted by a reviewer on Amazon

To make matters worse the script examples in the docx file that the seller gives the link to have a few typos that are just enough to keep the clock module from working unless you understand enough about bash scripts to see the errors and fix them when entering the changes to your system files