Tools Featured in this Teardown

Introduction

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.

This teardown is not a repair guide. To repair your Honeywell Water Sensing Alarm, use our service manual.

  1. The Honeywell Water Sensing Alarm has three components:
    • The Honeywell Water Sensing Alarm has three components:

      • Sensing Cable

      • Extension Cable

      • Base Station

    • Disconnect the RJ-11 jack that connects the base station to the extension cable.

    • Disconnect the RJ-11 jack that connects the extension cable to the sensing cable.

    Add Comment

  2. 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
    • 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

    • Disconnect the 9V battery connector from the battery

    Add Comment

  3. Spread Fixmas Cheer
    Get $12 off your purchase of $50 or more with code FIXMAS12
    Spread Fixmas Cheer
    Get $12 off your purchase of $50 or more with code FIXMAS12
    • Unscrew the 4 screws holding the plastic enclosure together with the Phillips #1 Screwdriver

    • The circuit board slides off of plastic standoffs for closer inspection

    Add Comment

    • The circuit board has three notable components

      • Microchip PIC12F510 8-bit microcontroller

      • Piezoelectric buzzer for water alert

      • RJ-11 Connector

    • The Microcontroller provides a signal for the speaker and interprets the signal coming in from the RJ-11 connector.

    • 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.

    Add Comment

Dylan Kirkby

Member since: 09/09/2013

111 Reputation

1 Guide authored

0 Comments

Add Comment

View Statistics:

Past 24 Hours: 0

Past 7 Days: 2

Past 30 Days: 18

All Time: 1,076