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Last Updated on: Tuesday, June 01, 2021 03:06 PM

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More  Hour Meters


This hobby circuit allows an off-the-shelf battery powered digital hour meter to be turned on and off, according to a machine's operation, without requiring a direct electrical connection to the machine. Machine vibrations are detected by an off-the-shelf piezoelectric wafer. The wafer is normally used as a sound generator. The 3v power could be tapped from the hour meter's own lithium battery or from a separate 3v lithium battery. The circuit only draws about 1.5uA, so a 250mA-hr battery would power the circuit for about 10 years.
Published in EDN, Jan 16, 1997

Click on Circuit Below to view PDF of Schematic

Machine Vibration Activated Hour Meter designed

 by Dave Johnson, P.E. (Dec 16, 1996)

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