I think, its nothing | Electronics › Electronics › explanation of Water level controller cum indicator circuit › I think, its nothing June 12, 2012 at 6:24 pm #8019 AJISH ALFREDParticipant I think, its nothing but, H highest level L lowest level P1, P2, P3 ponts between those levels. You can use a non-corrosive metal rod. Vcc can be upto 12V. Its all there in the link posted by you.
