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The Honeywell RWD41 Water Defense Water Sensing Alarm (available on Amazon) sounds an alarm when its sensing cable is submerged in water. This product detects water leaks early and saves homeowners costly water damage repair bills.
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The Honeywell Water Sensing Alarm has three components:
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Sensing Cable
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Extension Cable
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Base Station
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Disconnect the RJ-11 jack that connects the base station to the extension cable.
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Disconnect the RJ-11 jack that connects the extension cable to the sensing cable.
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Pop open the battery case with a fingernail and carefully remove the 9V battery without breaking the 9V battery connector still attached to the battery
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Disconnect the 9V battery connector from the battery
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Unscrew the 4 screws holding the plastic enclosure together with the Phillips #1 Screwdriver
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The circuit board slides off of plastic standoffs for closer inspection
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The circuit board has three notable components
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Microchip PIC12F510 8-bit microcontroller
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Piezoelectric buzzer for water alert
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RJ-11 Connector
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The Microcontroller provides a signal for the speaker and interprets the signal coming in from the RJ-11 connector.
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The Microcontroller runs off 2.0-5.5V (from datasheet here) so the board also regulates the battery 9V down to a voltage usable by the microcontroller.
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