The "Solder:Time Desk Clock LTE" from SpikenzieLabs (www.spikenzielabs.com/Catalog/watches-clocks/solder-time-desk-clock-lte) is a fun kit to assemble and results in functional clock that doubles as a conversation piece.
The only down-side to the clock is that it is based on the DS1317 Real-Time Clock (RTC) IC which can drift by 50 parts per million (ppm). This can be up to 4 seconds per day. Since this can add up to a couple minutes per month, the time needs to be reset every month or two.
The DS3231 is a highly accurate version of the Real-Time Clock.
It has a built-in, temperature compensated oscillator that is
accurate to +/- 2 ppm. This keeps accurate time within 5 seconds
per month. The DS3231 is functionally compatible with the
DS1317, but is only available in a larger 16-pin footprint. This
project provides an adapter PCB that allows the DS3231 to plug in
to the DS1317 socket.
As can be seen in the photo, this increases the height of the RTC.
This is not a problem as the LTE version of the kit has no case.
It should not be a problem in the standard (case) version either
since the new height is still below the top of the TO-220 voltage
regulator, but that has not be verified.
Parts List:
| QTY |
Description |
MFG Part Number |
Digikey Part Number |
~ Price (U.S. $) |
| 1 |
DS3231 RTC | DS3231S# | DS3231S#-ND | $13 |
| 1 |
SMD Header | HDR100IMP40F-G-V-SM | HDR100IMP40F-G-V-SM-ND | $1 |
| 1 |
Adapter PCB |
See below |
N/A |
$1.35 |