Desiging a water level automatic controller

Thread Starter


Joined May 12, 2013
I am designing a water level controller.
I want d machine to stop pumping whenever the water level reached the peak and on when it reaches the half. I plan putting the common terminal to the lowest part of the water tank.
I'm having problem with switching on the machine at the middle as I planned.
I'm using NE555 bistable connection. Please, HELP!


Joined Jun 22, 2012
Use a bistable circuit similar to this 555

the timer starts when the level is below the lower limit and stops at the upper level, Only problem would be erosion of the electrodes over a large period of time.