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Ssensors / Detectors: Light Detectors and Optical Sensors  
Sensors / Detectors -- Main Page

Liquid Detectors / Liquid Sensors:   #'s - D       E - S       T - Z

 

Last Updated: November 30, 2017 10:28 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 David A. 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

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747




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

1 wire bus powers water level sensor -  02/15/00 EDN Design Ideas:  remotely monitor the level of liquid water in a vessel such as a swimming pool __ Circuit Design by Dale Litwhiler, Lockheed Martin, Newtown, PA - February 15, 2001

1.5V Water Level Alert -  This circuit will emit an intermittent beep (or will flash a LED) when the water contained into a recipient has reached the desired level.  it should be mounted on top of the recipient (e.g.  a plastic tank) by means of two crocodile clips, acting also as probes.__ Red Free Circuits

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.   __ Designed by G. Forrest Cook

12VDC Sump Pump Control -  A simple control to turn on and off a 12v DC sump pump (like a boat bilge pump) as water level rises in the sump.   __ Designed by Burton Lang

12-volt Cellar Drain Pump -  This circuit lets you control a pump, to keep the level of water in a cellar below a certain threshold, for example.  Power is supplied to the pump by a battery that is recharged automatically when the AC powerline voltage is present requires login to see circuit __ Designed by Published in Elecktor July/Aug, 2010

1-wire bus powers water-level sensor -  02/15/00 EDN Design Ideas:  remotely monitor the level of liquid water in a vessel such as a swimming pool __ Circuit Design by Dale Litwhiler

7-segment Display Water-Level Indicator -  This water-level indicator uses a 7-segment display, instead of LEDs, to indicate the water level (low, half and full) in the tank.  Moreover, a buzzer is used to alert you of...__ Electronics Projects for You

Adjustment Free Inclinometer operates on 27V -  4/24/97 EDN Design Ideas:  The circuit in Figure 1 is an inclinometer (tilt-measuring circuit] in which the sensor is filled with liquid electrolyte.  Acting like a potentiometer, this sensor produces a voltage proportional to the tilt on the center electrode.  Because the liquid is subject to electrolysis, the sensor must have an ac-forcing voltage with an average dc component of zero __ Circuit Design by John Wettroth, Maxim Integrated Products, Sunnyvale, CA

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 David A. Johnson P.E.-June, 2000

Aqua Alarm -  Here is another interesting hobby circuit built around the popular and inexpensive 555 IC .  it is nothing but a water sensor, which you can be configured as a rain alarm, water tank overflow alarm, aquarium water leak indicator, etc.  it can be powered from any 6VDC supply.  initially, when DC supply is fed to the circuit the Red __ Designed by T.K. Hareendran

Automated Plants Watering System -  During summers, most people are too lazy to water the potted plants on their rooftop gardens every day.  Explained in this section is a simple and exciting plant watering system that...__ Electronics Projects for You

Automatic Plant Irrigation System -  Here is a simple project more useful in watering plants automatically without any human interference.  We may call it as Automatic plant irrigation system.  We know that people do not pour the water on to the plants in their gardens when they go to vacation or often forget to water plants.  As a result, there is a chance to get the plants damaged.  This project is an excellent solution for such kind of problems.__ 

Automatic Rain Gauge with Digital Readout -  it collects, measures, records and empties.  Best of all, you don't have to leave the house.__ SiliconChip

Automatic water level controller -  This is simple automatic water level controller circuit.  it will make you more comfortable Because it enables open – close water pump automatically.  When full of water, was ordered off the water.  But When levels gradually reduced To the required, Then turned on fully the water.  So We do not have to worry about overflow and water out anymore.__ 

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...__ Electronics Projects for You

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 __ Designed by Dick Cappels

Bedwetting/Wet Diaper Alert System -  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, or with a wet nappy.  Bedwetting/Wet Nappy alert system provides a very __ Designed by T.K. Hareendran

Build a Water Level Indicator -  Low-cost circuit lights a LED bargraph to indicate the level in a rainwater tank.__ SiliconChip

Check Consistency of Binary Addresses -  09/28/95 EDN Design Ideas:  The validation circuit in Fig 1  allows you to check the consistency of successively recurring 3-bit address codes.  The circuit simultaneously applies the address code to the A port of IC 2, a 7485 magnitude comparator, and to IC 3, a 1-of-8 decoder.  When IC 2's B port reads the same address latched on the output of D flip-flop,  __ Circuit Design by Arthur Edang, Don Bosco Technical College, Mandaluyong, Philippines

Check Swamp-Cooler Water Level -  10/31/02  EDN Design Ideas:  A "swamp cooler" is an easy way to obtain effective air conditioning, especially in hot and dry climates, if a water source is readily available.  Although most units are very reliable, the storage-reservoir control usually uses a single level-detector component.  Failure of this component can lead to serious water damage __ Circuit Design by Daniel Krones, Precision Design Services, Sky Forest, CA

Christmas Tree 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 __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Circuit Checks Consistency Of Binary Addresses -  09/28/95 EDN Design Ideas:  The validation circuit in Fig 1  allows you to check the consistency of successively recurring 3-bit address codes.  The circuit simultaneously applies the address code to the A port of IC 2, a 7485 magnitude comparator, and to IC 3, a 1-of-8 decoder.  When IC 2's B port reads the same address latched on the output of D flip-flop,  __ Circuit Design by Arthur Edang, Don Bosco Technical College, Mandaluyong, Philippines

Circuit Checks Swamp-Cooler Water Level -  10/31/02  EDN Design Ideas:  A "swamp cooler" is an easy way to obtain effective air conditioning, especially in hot and dry climates, if a water source is readily available.  Although most units are very reliable, the storage-reservoir control usually uses a single level-detector component.  Failure of this component can lead to serious water damage __ Circuit Design by Daniel Krones, Precision Design Services, Sky Forest, CA

Circuit provides ISFET-sensor bias -  10-Jun-04 EDN Design Ideas:  iSFET's (ion-sensitive field-effect transistors] are useful for measuring the acidity of fluids.  Accurate measurements require that the iSFET's bias conditions (iD and VDS] be held constant while the gate is exposed to the fluid under __ Circuit Design by Brian Harrington, Analog Devices, Wilmington, MA

Cistern Overflow Alert System -  The system presented here will electronically monitor cistern (tank that holds water to flush the toilet) overflows that can otherwise cause seepage in the flats below in a multi-storied building.  in...__ Electronics Projects for You

CMOS -NAND Gates Control Sump Pump -  05/14/09  EDN Design Ideas:  A similar circuit lets you control both the sump pump and the water level __ Circuit Design by V Gopalakrishnan, Indira Gandhi Center for Atomic Research, Kalpakkam, India

Digital Soil Moisture Meter -  A soil moisture meter is used for indicating the water content of a given soil sample.  As crop production requires water at different stages and in different amounts, it is important...__ Electronics Projects for You

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...__ Electronics Projects for You

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.-June, 2012

Doorbell Transformer Acts as Simple Circuit Water-Leak Detector -  112/05/09 EDN Design Ideas:  Doorbell transformer acts as a power supply __ Circuit Design by Jeff Tregre, www/BuildingUltimateModels/com, Dallas, TX

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Liquid Detectors / Liquid Sensors:   #'s - D       E - S       T - Z


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