Water / Moisture Circuits - Sensors and Detectors

12 Volt Toilet Tank Refiller: 

Hot Water Tank Indicator: 

Plants Watering Watcher:  Varying brightness LED signals the necessity to water a plant. Very Low consumption,3V powered Circuit

Plants Watering Watcher 2: 

Rain Detector: 

Simple Emergency Sump Pump Control:  Sump Pump Control for12V DC Bilge Pump

Water Level Alarm: 

Water-Level Sensor Uses Hysteresis:  08/21/00 Electronic Design - Ideas for Design / A low-voltage electronic circuit that senses upper and lower water levels is often used for alarms and sump-pump activation. Since an electronic sensor has no moving mechanical parts, it eliminates problems with corrosion and wear and tear.