A simple circuit and Arduino code to turn a moving coil meter into a mains frequency meter. As used for the artwork entitled "Time for Tea?":

 http://andrewback.net/works/Time-for-Tea

The circuit and source code should be reasonably self-explanatory, but I'll add a few notes here in due course.

Schematic documented using gEDA. No board layout has been completed as it was simple enough to construct on prototyping board.

Copyright 2010-2011 Andrew Back.