DS1338 RTC Arduino Library
This library is based on https://github.com/richard-clark/ds1337 project. Thanks.
The main difference between ds1337 and ds1338:
- ds1338 has 56 byte battery backed ram with unlimited writes.
- ds1338 has no alarm.
- ds1338 has VBAT Pin.
The library can be easily migrated to other platform because most of the code is standard C code.
Note: If you want to use the square wave output, do not forget to add a pullup resistor, because the SQW pin is open drain.