Sensor circuit diagrams

This sensitive circuit is basically a comparator, detecting very slight temperature changes in respect to the ambient temperature. It was primarily intended to detect draughts around doors and windows that cause energy leaks but can... [more]

circuit from:http://www.extremecircuits.net/2010/01/energy-leak-detector-circuit-diagram.html

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

This device beeps intermittently for about two seconds when a person in a range of around 10 meters emits a whistle. The first two inverters contained in IC1 are used as audio amplifiers. IC1A amplifies... [more]

circuit from:http://www.extremecircuits.net/2009/12/whistle-responder-schematic-circuit.html

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

This circuit is intended to signal, through a flashing LED, the exceeding of a fixed threshold in room noise, chosen from three fixed levels, namely 50, 70 & 85 dB. Two Op-amps provide the necessary... [more]

circuit from:http://www.extremecircuits.net/2009/12/room-noise-detector-circuit-schematic.html