Display for GPS clock.
|To see the time on a normal(ish) clock we started off with a sidereal clock from AWR
which normally runs off its own quartz crystal. This was modified by
chucking out the main control board and making a new one to control the
LCD. While this is a strange way to build a clock it was convenient as
we already had the clock (we didn't buy it for the purpose of
rebuilding it). The new board is basically just a micro with a serial
port. It receives time information from the GPS clock and displays it
on the LCD, synchronised with the 1Hz reference pulse. The new version
also shows sidereal time just like the original clock using the GPS
longitude and a pile of maths to figure out the time.