Fluid and humidity circuit diagrams

Plants Watering Watcher
November 18, 2010

This circuit is intended to signal when a plant is needing water. A LED illuminates at maximum brightness when the ground in the flower-pot is too dry: it dims gradually as the water's content in... [more]

Salt Taster
November 15, 2010

This circuit was designed to detect the approximate percentage of salt contained in a liquid. After careful setting it can be useful to persons needing a quick, rough indication of the salt content in liquid... [more]

Rain Detector
November 15, 2010

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... [more]

Water Alarm Circuit Diagram
September 27, 2010

Have you ever seen the stairs to one of the upper stories in your house turn into a waterfall? Or maybe you’ve come home to find your aquarium fish trying to swim across the carpet?... [more]

circuit from:http://www.extremecircuits.net/2010/04/water-alarm-circuit-diagram.html

Water Level Alert Circuit Schematic
September 27, 2010

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... [more]

circuit from:http://www.extremecircuits.net/2009/12/water-level-alert-circuit-schematic.html

Water Level Indicator Circuit Schematic
September 27, 2010

When the water-level is below the steel rods, no contact is occurring from the metal can and the rods, which are supported by a small insulated (wooden) board. The small circuit built around IC1 draws... [more]

circuit from:http://www.extremecircuits.net/2009/12/water-level-indicator-circuit-schematic.html

Automatic Water Tank Filler Circuit Diagram
September 27, 2010

This circuit has been very useful in filling a header tank for a reticulated water supply on a farm. Eight troughs are supplied in different paddocks where a lack of water would have serious consequences... [more]

circuit from:http://www.extremecircuits.net/2010/03/automatic-water-tank-filler-circuit.html

Plant Watering Watcher Circuit Schematic
September 27, 2010

This circuit is intended to signal when a plant needs water. A LED flashes at a low rate when the ground in the flower-pot is too dry, turning off when the moisture level is increasing.... [more]

circuit from:http://www.extremecircuits.net/2010/01/plant-watering-watcher-circuit.html

Water Pump Relay Controller Circuit Schematic
September 27, 2010

By means of a Relay, employed to drive a water pump, this circuit provides automatic level control of a water reservoir or well. The shorter steel rod is the "water high" sensor, whereas the longer... [more]

circuit from:http://www.extremecircuits.net/2010/01/water-pump-relay-controller-circuit.html