Water Level Sensor/Detector/Monitor With Alarm

This schematic diagram shows a water level sensor/detector/monitor circuit. An alarm is also featured in this circuit. Any fluid with a resistance under 900K between the maximum separation distance of the probes will trigger this circuit. A 4050B CMOS hex buffer is used on this circuit that is working at 5 volt supply.  The 10M resistors connected between buffer input and ground bias all gates off.

Water Level Sensor Detector Monitor With Alarm circuit schematic diagram

The “common” probe the topmost probe above probe 1 in the schematic diagram above is connected to the positive 5 volt supply. The top gate is activated and the LED 1 will light, when probe 1 is spaced 1 cm away from the common probe and tap water at 25 C is detected between the probes (a resistance of 20k). Similarly if probe 2 at 2 cm distance from the common probe detects water, LED 2 will light and so on. To select which output from the hex buffer, this circuit use Switch 1. It will trigger audible oscillator made from the gates of a CMOS 4011B IC. [Circuit’s schematic diagram source: www.zen22142.zen.co.uk]

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