MakerFocus Raspberry Pi RTC Module DS1307 Real Time Clock Module with BAT for Raspberry Pi

This real-time clock works well. I have them in the original raspberry pi and the newer ones as well and they've been great. It is really easy to install and it hasn't blocked any of the components I've had. There are plenty of how-to's online to get this working on the pi as well; I've used them to keep the time on my weather-sensors.

Got this because setting an upstream DNS that uses DNSSEC caused all responses to come back bogus due to the pi being unable to reach out to a ntp server to update its time after a reboot. The good news is that this module works and I'm validating properly now. The bad news is that it doesn't fit too well. The battery is on the bottom and on the 4 model b it hangs over the cpu. I have a heat sink on the cpu and the battery is very, very close to the heat sink. It's not touching it but it's close enough that you couldn't fit your finger nail between the two. I'm not sure how comfortable I am with the battery being so close to the heat sink and will probably look for a new rtc module or try to reduce the size of the heat sink. Additionally, if you have a small case you'll need to remove the lid ( and fan if you have one on the lid ) as the gpio pins on top will prevent the lid from closing unless your case is extra tall.

I had a Pi that needed to retain the clock after an outage, otherwise the application broke. I looked at a lot of other solutions and this RTC add-on did the trick! The battery was easy to install, and I really like that it can be replaced if needed (my future self will really appreciate this!). I had to bend the top pins to close the case I was using (carefully one at a time), but I understand some people may want those pins accessible. After following the instructions in one of the comments I was up in minutes! After simulating multiple outages, it didn't lose time anymore! The application resumed normally and I was happy.I should also add that I used this for an early model A, which is not explicitly listed as being supported.So, to summarize:- Removable battery! A+ feature, and it's included!- Pins can be bent to fit in smaller cases- Pins are still accessible if you need them- Software configuration is super easy!- Actually keeps time after power outage!

It is what it is, a cheap RTC. I cannot say to the accuracy of the things, I just managed to get them to work. As a review posted above, Googling "1307 RTC in pi" will get you in the ball park, especially if you're using RASPI or another DEB distro. I'm using CENTOS/RHEL... so yea... fun!I got two, physically with added headers at the top of the PCB, these will not fit in a standard case. For my older RPIII, I had to snip them off. My other RPIII B+ has cutouts for the GPIO so no issue there. Otherwise, no issue mounting.Configuring, this took some time. With CentOS, there isn't a fake HW clock to deal with, so once all of the configurations were completed, it worked. What I did: - yum install i2c-tools - edit (or add) /boot/config.txt (add the following lines): dtparam=i2c_arm=on enable_uart=1 dtoverlay=i2c-rtc,ds1307- in /etc/moudules-load.d create a .conf file (name doesn't matter, must be .conf), add the following: i2c-bcm2708 i2c-dev rtc-ds1307- lastly in /etc/rc.local add the following lines: echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device sudo hwclock -s #Sync sys clock to hwclock at startup date- rebootI may be missing a thing or two, but this should get you in the ball park. To sync RTC to system $sudo hwclock -w (once you have good time). I do recommend doing some Googling for troubleshooting and other commands.What I need these for are my two Pi's are my network managers/network syslog for a fairly complex home lab. Logs and timestamps are very important when/if I lose power or NTP connection. So, I want to make sure I can bring them up and retain a relatively stable time. I do plan on addressing the accuracy issue using a cron job to sync the RTC from system when I have good NTP.

It arrived in good condition and it installed on my raspberry pi 4 as far as I know it works great have had no issues so far won't be able to really tell until we find a home to move to. We're I am at right now I don't have room for my stuff so it is all in storage.

Works great for the Raspberry Pi 4

Or are running without a case. There are some other RTC's out there that will work as well, if not better.For the case I have, I had to end up bending the pins on top at a 90 degree angle to get the case top on. I was still able to hook the fan up, but I also had to mount the fan on the outside of the case.It's not that big of a deal, but you do need to plan for it.As far as operations.. it does exactly what it's supposed to.. keeps the time when the RPi for my astro rig is turned off.

Cannot find instructions or software to run this module.