|This clock is intended to be a surprise to visitors, who activate the clock's display by removing the lid.
WARNINGThe lid has 2 powerfull magnets glued underneath which are capable of magnetizing the mechanism of a watch which comes close, causing it to stop.
The only control is underneath tjhe panel. It is a 3-way slide switch to set the hour one hour ahead for pacific DST or stardard mountain time, or 2 ahead for Mt. DST.
It is made with three sub-assemblies:
These are the photos of the finished clock.
Here is the Arduino sketch.
Here are the circuit diagrams.