30 Jun '15, 11pm

Disassembled Mouse Keeps Track Of Gas Meter

Fantastic hack, but I wonder if it wasn’t overly-complicated? I wouldn’t try to photograph the dial and read it like a human brain does. I would simply measure the reflected brightness of a slice of the dial. When the brightness has bottomed out and returns to regular level again, I know the hand has passed once. I would log the timestamp when this event happens. This marks the consumption of “0.071 ft3″. No sharp image needed, no image processing. Just an LED and a PV cell, and something measuring voltage levels. Keep track of typical maximums and minimums to decide when the threshold has been passed. Work out the gas consumption by the interval between timestamped events. As you may already know, this is how consumer electric meter monitors work, by logging the moment it’s embedded IR LED blinks. That marks the moment a full Kwh has been consumed. Calculating consumption...

Full article: http://hackaday.com/2015/06/30/disassembled-mouse-keeps-t...

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