Ltd DS3231 RTC MODULE FOR RASPBERRY PI

Works as advertised.

Does the job. I struggle to comprehend how a computer manufacturer can ship a board without a real time clock, and depending on NTP. Yet, Raspberry Pi 4 did, to add to their list of ineptitude. This fits easily, minimal fuss to install, although you do need to google the instructions. Then, hey look... a few pennies worth of circuit gives you a real time clock and a reliable system. Who would have thought...

Shame on the embedded SoC designers for not including an RTC as standard, so it has to be added separately.Only 4 stars, because it doesn't provide any easy way to share the I2C pins.I'll probably have to buy/make a multiplex header if I need to add any more I2C devices.

Unlike a desktop computer, notebook computer, or a tablet, a Raspberry Pi (RPi) computer does not include any electronic circuit or battery for time keeping when its power supply is off. Instead, upon every power up and boot up sequence, a typical RPi system connects to a time server on Internet, obtains the current date and time and sets the system's date and time.However in one of my projects: a system with Raspberry Pi 3 Model B Quad Core CPU 1.2 GHz 1 GB RAM Motherboard is required to keep track on the current date and time; there are long periods without power and there is no Internet connection. So I have bought this Real Time Clock (RTC) module, I am using it for over a month now and I am happy with it. It came with a webpage address on its label. A search on that webpage led me to a list of instructions, then it took me about 15 minutes to have the RTC up and running with Raspbian.Safety tip: Do not forget that this module has a battery soldered to it, so always handle it with extra care.Pros:(+) It is cheap (provided it stays under EUR7.00).(+) Its overall dimensions are small: with the RTC module installed, you still have enough space to mount a heatsink onto the Broadcom chip (see 3rd picture) and you get enough clearance to the lid of a casual RPi enclosure (see 4th picture with KuGi Raspberry Pi 3 Model B case - High quality PC Protective Case with 2x Heatsinks for Raspberry Pi 3 Model B, Pi 2 Model B & Pi Model B+ (Black)). The PCB dimensions of this RTC module are 14 x 14 mm and the height is 12.5 mm.Cons:(-) Very minor point: the PCB edges are a bit rough.

This module is easy to set-up and fits in the Raspberry Pi 4 official case. The instructions on the Forum are accurate and easy to follow. Pretty foolproof.Would recommend.

Great little RTC, set up with a Pi using the instructions at hobby components website and working great. Simple plug in design works well with GPIO pins.

This RTC works on my first gen RPi. Although it's not as accurate is my GPSDO, but it is a real clock!

Super little Real time clock module for my Raspberry Pi 4.