Lunchtime Clock

Step 9 Synchronize the clocks

Put a new ATMEGA168 chip into the Arduino. Connect the Arduino once more to the RTC board.

Run the sample code from Ladyada's page. Open the serial monitor. The time displayed here is the time you are going to want to sync your clock to.

I found it was easiest to set a third clock (my computer clock) to be perfectly in sync with the RTC board. Then, I powered down the Arduino, transferred the RTC board back to my circuit and set the Lunchtime Clock to a minute later than my computer time. At just the right moment, when the minute changed on my computer, I powered up the lunchtime clock to achieve synchronicity.

The lunchtime clock works extremely well and has thus far surpassed my expectations.