I am using two different circuits for this. I made the Water Level Indicator circuit with IC ULN 2003.2nd circuit for Pump Control made with IC555. This circuit will off the pump when Tank is Full and you set up the Water Level where you want to ON the pump again

You can check my both video for these two circuits to click these links:- Water Level Indicator / Water Pump Auto On/Off Best Circuit. I marked with +, 2, 8 in both circuits joint these points.

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