aqua alarm circuit

Water Alarm Circuit

Here is another interesting hobby circuit built around the popular and inexpensive 555 IC. It is nothing but a water sensor, which you can be configured as a rain alarm, water tank overflow alarm, aquarium water leak indicator, etc. It can be powered from any 6VDC supply. Initially, when DC supply is fed to the circuit the Red LED remains in OFF state. However, when presence of water is detected between the sensor probes (A&B), the LED starts blinking at a slow rate.

Schematic of the Water Alarm Circuit

aqua alarm circuit

An application example

This circuit can be wired to flash the LED when the water contained into a plastic tank has reached the desired level. It should be mounted on top of the plastic tank by means of two small needles , acting also as sensor probes. If a deeper sensing level is needed, the needles can be extended by means of two pieces of flexible wire.

Aqua Alarm - Fig 2

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  • gogutu

    Buna ziua Marian.As dori si eu o schema pentru a automatiza o pompa care trage apa dintr-un put de la 40 m adancime.Pentru ca sunt nevoit sa stau langa pompa atunci cand functioneaza,sa o opresc atunci cand nu mai are apa in put,e stresant.problema e urmatoarea:doresc o schema care sa opreasca pompa atunci cand nivelul apei scade la un anumit nivel,si sa porneasca atunci cand nivelul apei a atins nivelul maxim.diametrul putului este de 100mm,si adincimea de 40 cautat in comert senzori dar nu am gasit.deoarece nu am loc sa pot introduce un plutitor de nivel,pentru a inchide si deschide alimentarea pompei,te rog sa ma ajuti cu o schema pentru automatizarea pompei.multumesc anticipat