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Arduino-based master clock for schools

Step 9It works!

It works!
The new master clock has been installed and is working properly at an actual elementary school.

This is a great way for all the teachers to know who you are. Random children will come up to you and thank you for "fixing the clocks". Yes, people will even approach you in the local grocery store and thank you! They key here of course, is not to replace the broken master clock right away, but to wait a while before doing so.

The master clock handled the 1 November 2009 transition from daylight savings to standard time. The master clock showed the correct time, but the slave clocks did not. This was due to an electrical wiring problem (bug) where the synchronization signal relay was getting power only from the battery, and the battery was too weak. This was fixed and now the battery drain problem has also been fixed.

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Author:MasterClockMaker