Here's some data that may be interesting concerning the accuracy of this clock thus far.
Clock with NIST, with the following results:
Clock Watch NIST Watch 8:00:00 8:00:00.00 8:10:00 8:09:59.38 8:01:00 8:00:59.89 8:11:00 8:10:59.42 8:02:00 8:01:59.99 8:12:00 8:11:59.39 8:03:00 8:03:00:00 8:13:00 8:12:59.24 8:04:00 8:03:59.90 8:14:00 8:13:59.39
Average of five measurements: 8:00:00 7:59:59.956 8:00:00 7:59:59.364
So the clock is now ahead of NIST by 0.956 - 0.364 = 0.592 seconds.
We started the clock speed test on 02/17/22 so now the results so far are:
03/04/22 02/17/22 Clock Time 07:59.59.956 12:00:00.176 NIST Time 07:59:59.364 11:59:59.774 Difference 0.592 second 0.402 second
So the clock is now ahead of NIST by 0.592 seconds and it was originally ahead of NIST by 0.402 seconds, so it has actually gained only 0.592 - 0.402 = 0.190 seconds in 03/04/22 - 02/17/22 = 14.83333 days. So the clock is running fast by 0.190/14.8333 = 0.0128 sec/day = 12.8 ms/day = 0.39 sec/month = 4.68 sec/year.
Your accuracy may vary due to climate conditions in your location, and time of year. We expect to do another calibration in a few months.
Steve using the black and yellow shield V4 would you still need to short the two pins on the DS3231.
Steve: I have the black and yellow CNC shield V4 would the driver code have to be changed to run the clock.
The silent clock with the original controller and a TPU hub gear you cannot hear anything.
If you want the silent clock to be silent, make the hub gear out of TPU what a difference it is suuuuuper quiet.
Steve: I downloaded what I thought by the description was the Silent Clock with the new base for the CNC shield V4 but it was not. thanks Norm
Steve: I printed gear 1 and 2 at 100.5% they mesh better and the clock is quieter. Working good.
I have finished the Silent Clock built the motor controller uploaded the ino to the Ardunio clock runs but second hand is gerty and the stepper motor is noisy.