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12 Volt Toilet Tank Refiller - (circuit / design added 8/03) |
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AN1013: Gas and Water Metering with the PIC16F91X Family - Microchip Application
Note Published 20-Jan-06 (app note added 2/06) |
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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 decoration-laden branches ...(electronic design added 7/08) |
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Gas and Water Metering with the PIC16F91X Family - Microchip Application Note
Published 20-Jan-06 (app note added 2/06) |
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Hot Water Tank Indicator - (circuit / design added 8/03) |
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One 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.....(design idea
added 2/06) |
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Plant Moisture Meter (Randy Linscott) - Stick the metal probes into a freshly
watered plant and adjust R5 for a mid-scale meter deflection. The meter will monitor
the soil wetness and the meter will indicate whether it is to moist or to dry. This
circuit uses a dual power supply which could be created by two 9 volt
batteries….(added 05/08) |
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Plant Moisture Monitor - (circuit / design added 8/03) |
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Plant Power - Following a hunch, the author discovered (or re-discovered?) that
all plants carry an electric charge relative to the ground. This charge is more or
less constant regardless of the size of the plant, a kind of "background voltage" in
nature....(electronic design added 6/07) |
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Pot Plant Power - All plants carry an electric charge relative to the ground. This
charge is more or less constant regardless of the size of the plant a kind of
background voltage" in nature. This electric charge suffuses the entire plant, from
its roots to its leaves and fruit. It was measured between a chrome-plated pin
inserted into the plant .... (added 6/03) |
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Pot plant water tester - (electronic circuit added 10/05) |
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Rain Alarm - This circuit gives out an alarm when its sensor is wetted by water.
A 555 astable multivibrator is used here which gives a tone of about 1kHz upon
detecting water. The sensor when wetted by water completes the circuit and makes
the 555 oscillate at about 1kHz.….(design added 03/08) |
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Rain Detector (Aaron Cake) - This circuit uses a sensor made of a small piece of
etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR
could also be used to activate a relay, turn on a lamp, or send a signal to a security
system. (circuit / design added 8/03) |
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Shower Stopper - (circuit / design added 8/03) |
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Water Activated Relay - The circuit uses a 555 timer wired as an astable
oscillator and powered by the emitter current of the BC109C. Under dry conditions, the
transistor will have no bias current and be fully off. However as the probes get wet
the transistor will conduct and sounding the alarm. An On/Off switch is provided and
remember to use a non-reactive metal.....(electronic schematic / circuit added 4/02) |
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Water Level Alarm (Andy Collison) - (electronic schematic / circuit added 4/02) |
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Water Level Control/Monitor - A simple way to control the level of any liquid in
any container. (electronic schematic added 05/04) |
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Water Level Reference Design - The Water Level Reference design continuously
monitors water level and water flow using the temperature compensated MPXM2010GS
pressure sensor in the low cost MPAK package, a dual op–amp, and the MC68HC908QT4,
8–pin microcontroller. This system uses very few components, reducing the overall
system cost. (app note added 3/05) |
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Water Seepage Alarm - 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. ….(designed by David A. Johnson) |
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Water-level Alert - Beeper or flashing LED alert. (electronic design added
6/07) |
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Water-Level Controller - (electronic Circuit / Schematic added 10/04) |
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Water-level Indicator - The whole project was developed on a friend's request. Its
purpose was to remotely monitor the water-level in a metal tank located in the attic
by means of a very simple control unit placed in the kitchen, some floors below.
….(electronic schematic added 11/08) |
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Water-level Sensing and Control - (Tony van Roon's circuit / design added 8/03) |