Made DogLifeClock again because of new puppy.
I used VFD this time.
Upper line indicate current time.
Lower line indicate dog's infomation(name,birthday,livingdays,age).
I bought DS3231(a set of 3)
Calibrated Aging register because of getting more accuracy.
Compared 1PPS on GPS and 1Hz(SQW terminal) on DS3231.
Drift is about 2 or 3ticks when Aging register is 3.
Aging register is kept its value by Battery.
Upper line on characterLCD indicate ticks of 1PPS.
Right of Lower line is ticks of 1Hz of DS3231SN and left is value of Aging resister.
2pcs are DS3231SN.
1pc is DS3231M.
DS3231M's drift about 200ticks.
DS3231SN have TCXO(+-2ppm).
DS3231M have MEMS(+-5ppm).
I bought Makeblock Me LED Matrix 8×16.
I watched this
I built up pen-plotter too.