This Realtime Clock has standard I2C interface, and is battery backed up for upto 10 years.
- Programmable clock-tick rate with choices as: 1Hz, 4096 ,8192,32786 Hz
- Counts Seconds, Minutes, Hours, Date of the Month, Month,
Day of the week, and Year with Leap-Year Compensation
- Leap year compensation valid until 2100
Using Realtime Clock with NXT
Have you thought of making your NXT aware of time?
Mark has done that using I2C interface and this Realtime Clock.
He has sent this contraption (pictured above) and related NXT-G programs are available here.