This is a simple circuit powered by a 741opamp. The relay does the switching of the pump or adapter of the water pump. It's a 230V/12V switching relay. Here you can find the schematic and the PCB layout also.
Water detector with 4 level stages. Each stage makes the 555 timer to give a supply period for the buzzer. The active buzzer transmits sound with a pause period between 0.5-3 seconds, depending on the level detected.
I am only a beginner at this. So would be very happy for anyone to point out problem with the
design. This would be very helpful.
The unit is design to be connected to 7 float similar to the one in the image,(attach file)
on the block Bottom right.
As the water rises the LED bar on the left indicates the level. Power & Buzzer indicator.
With the rotary switch top right to can set t...
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