Post Thu Feb 09, 2017 1:26 am

Adding GPS

This has been asked a few times so I though I would post a quick how-to.

The easiest module to use on a cylinder clock is the Skylab SKM 53, it's small enough to just about fit inside and sensitive enough to work indoors away from a window.

You'll need to connect the 5V pin to the left hand end of R8, ground to one of the large holes drilled for SK1 (just next to R7) and RXD to the top of R7 (just below R8), so all 3 connections are in the same area making it simple to tag it on above the clock PCB. Fit a 100R resistor in place for R7.