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Sensors / Detectors: Water / Moisture Sensors
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Sensors / Detectors -- Main Page
Last Updated on: Sunday, August 23, 2015 08:36 AM


Circuits Designed by Dave Johnson, P.E. :
  • Alarm sounds when Water is Detected -  This simple circuit sounds a beeper when its electrodes detect water. It is powered by a single 1. 5v N cell. A small 1. 5v button battery will also work . . . [Circuit by Dave Johnson P.E.,  06/11/00

  • Doggie Water Dispenser Alarm -  I have two Beagle dogs. They drink a lot of water; they go through about 3 gallons a week. They have two water dispensers. One is on the inside and second unit on the outside of my house. Often, I forget to fill one of their two jugs and discover them completely empty. I do worry that my dogs might get dehydrated if I ever forget to fill both of their containers . . . [Circuit by David A. Johnson P.E.,  06/04/12]

  • Electrodeless Water Level Monitor -  This is an illustration how a laser could be used to count traffic and measure the speed of each car passing through the sensor area . . . [Circuit by David Johnson P.E.,  07/09/06]

  • Locate a Plastic Pipe -  I used this circuit once to track down the location of a plastic pipe, buried underground. It transmits a weak RF signal, which can be picked up by a portable AM radio from about 6 feet away . . . [Hobby Circuit designed by David A. Johnson P.E.,  12/14/04]

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

1 wire bus powers water level sensor -  02/15/01 EDN Design Idea   You can use the simple sensor circuit in Figure 1 to remotely monitor the level of liquid water in a vessel such as a swimming pool. The LMC555 sensor oscillator provides an output-signal frequency that is a function of the water level. This signal drives a DS2423 pulse counter.  . .  [by Dale Litwhiler, Lockheed Martin, Newtown, PA]

12 Volt Toilet Tank Refiller -  A flushing toilet is something that most city dwellers take for granted, but it can be a luxury for those who live away from utility water and electricity. This circuit provides on-off pump switching for a small 12 Volt pump that is used to fill a toilet tank from an external rain water collection cistern. The 12 Volt power comes from a small solar power system. The cistern is located at ground level, so the pump is required to move the water up to the toilet tank. . .  [G. Forrest Cook]

1-wire bus powers water-level sensor -  02/15/01  EDN Design Idea   You can use the simple sensor circuit in Figure 1 to remotely monitor the level of liquid water in a vessel such as a swimming pool. The LMC555 sensor oscillator provides an output-signal frequency that is a function of the water level. This signal drives. . .  [by Dale Litwhiler]

7-segment Display Water-Level Indicator -  It is a circuit that indicates the level of water in a tank (low, half or full) on a 7-segment display. It uses a buzzer to alert the user about water overflowing from the tank. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved]

Alarm sounds when Water is Detected -  This simple circuit sounds a beeper when its electrodes detect water. It is powered by a single 1. 5v N cell. A small 1. 5v button battery will also work . . . [Circuit by Dave Johnson P.E.,  06/11/00]

AN1013-Gas and Water Metering with the PIC16F91X Family -  Application NoteTechnology Inc. . . .  [Microchip App Note last updated on 20-Jan-06]

Bedwetting alarm -  A simple two tone water alarm that is light enough to be worn on the upper arm of a sleeper is described. It uses two LMC555 CMOS timer chips followed by a complimentary pair of emitter followers to drive an 8 ohm speaker. Power is supplied by a 9 volt transistor radio battery. An modification to produce a siren rather than two tone operation is discussed. . .  [From Dick Cappels' project pages]

Bedwetting Alarm -  Bedwetting is one of the most common childhood problems that can have a significant impact on a child’s health if left unattended. During the night, the parents would not know if the child has urinated and the kid may sleep all night long on a wet bed. Bedwetting alarm provides a very effective solution to this problem. The alarm will sound as soon as the child begins to wet the bed. . . .  [T.K. Hareendran © EFY Enterprises Pvt. Ltd. All rights reserved]

Christmas Tree (or other plant) Moisture Monitor -  Originally intended to monitor the moisture in a potted plant, this moisture monitor really shines as a Christmas tree stand water level monitor! A fresh Christmas tree drinks water an annoying rate and bending down under the. . .  [Copyright © 1998 Wenzel Associates, Inc.]

Digital Soil Moisture Tester -  Here is a simple and compact digital soil moisture tester to check whether the soil is dry or wet. It can also be used to check the dryness or wetness of cotton, woolen and woven fabrics. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved]

Doggie Water Dispenser Alarm -  I have two Beagle dogs. They drink a lot of water; they go through about 3 gallons a week. They have two water dispensers. One is on the inside and second unit on the outside of my house. Often, I forget to fill one of their two jugs and discover them completely empty. I do worry that my dogs might get dehydrated if I ever forget to fill both of their containers . . . [Circuit by David A. Johnson P.E.,  06/04/12]

Electrodeless Water Level Monitor -  This is an illustration how a laser could be used to count traffic and measure the speed of each car passing through the sensor area . . . [Circuit by David Johnson P.E.,  07/09/06]

Gas and Water Metering with the PIC16F91X Family -  AN1013 - Technology Inc. . . .  [Microchip App Note last updated on 20-Jan-06]

Hot Water Tank Indicator -  The idea for this project may have come to me in a flash of inspiration, and its a very simple way to check if a fuse has blown without removing it from its holder. . .  [Andy Collison's website]

Locate a Plastic Pipe -  I used this circuit once to track down the location of a plastic pipe, buried underground. It transmits a weak RF signal, which can be picked up by a portable AM radio from about 6 feet away . . . [Hobby Circuit designed by David A. Johnson P.E.,  12/14/04]


Sensors / Detectors: Water / Moisture Sensors
#'s - L       M - V       W - Z
Sensors / Detectors -- Main Page


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