In this unique project an electromechanical display recovered from a 1960s pinball machine and some modern programming techniques together form a water-temperature indicator for an outdoor swimming pool. Once the temperature is displayed on the 4 inch reels, the consumption of my circuit drops to zero, but the temperature display remains perfectly visible. There are no batteries (dry or rechargeable), adjustments, or maintenance.

Published in Elektor issue 424, April 2012 www.elektor.com/110673

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