Robodyn is one of the few Chinese companies that managed to make a name for itself. They produce high quality Arduino clones and various electronics modules.
Today we review their DS1307 real time clock module.
Shop webpage: https://www.aliexpress.com/store/1950989
The first thing you’ll notice about this real time clock module is that it’s really small. For comparison, here it is next to a DS3231 RTC module:
Really, good job on Robotdyn’s team to make this product easy to embed. Excluding the header pins, the PCB dimensions are about 2.1×2.3mm.
Part of the reasons why the board could be shrunk so much is that it uses a CR1220 as a battery. This is a very small battery (provided) with the board. One downside is that this smaller battery provides only about 40mAh of capacity, whereas its big brother can deliver 220mAh. If you need to keep time for a system that will often be off, this battery might drain too fast. It’s however, plenty sufficient for a project where the battery will only be used in case of a power failure.
Plugging it in is a very simple job and works on a 5V Arduino; and it also works out of the box with Adafruit’s popular RTC library. You must use the SDA/SCL pins though (Digital 3/2 on a Uno, pins 20/21 on a Mega) but apart from that it is very much plug n’ play.
You can read online that the DS1307 might not be very good with cheap Chinese modules: this is not the case here. Robotdyn’s make is solid, and the module kept the time for over 2 weeks without any failure before I published this review.
If you are looking for a real time clock that is easy to interface, well made and small enough to embed into pretty much anything; this module will deliver on all aspects. As such, I can only highly recommend it. Again, the only downside could be the battery, but this is a trade off you might be willing to make. At slightly over a dollar a piece, bang for the buck can’t be any better.
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