if you need a simple circuit you need only a bistable multivibrator using 555...
no i think about a bistable multi vibrator like thisAre you concerning ultra sound range metter ?
no i think about a bistable multi vibrator
i need help on desinging a Linear water level indicator, can anyone pls help?
...perhaps measuring the water conductivity can also be made to give a practical indication about the water level...
But what kind ok sensor must be connected at both inputs 1 and 2 ?
The OP has asked for a "Linear water level indicator" , you solution can only work as an alarm when the level goes above/below a certain level, it is a on/off solution.
To get an linear level indicator you need some king of sensor that gives a result which depends on the water level.
...If need a lenear sensor , a simple float or potentiometer and lm3917 is enough...