RTC DS1307 i2C Real Time Clock Module
We sell loads of RTCs but we wanted a super low cost and reliable offering so we found these! Featuring the well-known DS1307 chip it’s very simple to get up and running. Simply add a CR1220 (not included due to shipping regulations) and included the DS1307 library in your sketch and with a little wiring you are up and running in no time.
This board uses I2c and has an on-board 4Kb EPROM (24C32)