Circuit - Watt Hour Electronic Circuits Designed by David A. Johnson, P.E.

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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, March 22, 2012 05:45 AM

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Watt Hour Circuits

Watt-Hour Meter Monitor: This is a simple and safe way to monitor the power and energy use of a typical home. A battery powered device is attached to the top of a typical spinning wheel type watt-hour meter. The device contains a visible red LED and a PIN photo diode. Light pulses are bounced off of the watt-hour meter’s spinning wheel. The circuit detects the black mark on the wheel and produces a clean TTL level logic signal, equal to the frequency of the wheel spin. This information can be connected to a low power RF transmitter to send to a matching receiver, where the information can be recorded and displayed.

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