Design a simple water controller in which electrodes are required to sense high and low water levels in a tank. Whenever the water level falls below the low level electrode, the water pump starts and it stops once the water level touches the high level electrode. There is a third electrode which is used to detect the water level from the pump suction port tank. If this electrode does not sense water, then the pump is not allowed to run. This protects it from burning out. Power is obtained from the AC line through an AC-to-AC Wall transformer. The control electronics and relay work from a 12VDC voltage regulator. It is assumed that you have a water pump already.
*** Disclaimer: This kit is meant to operate with equipment such as line operated water pumps or motor starter relays and/or contactors at lower control voltages. Line voltage is dangerous and if mishandled can cause injury or death. If you are not familiar or have not worked with line operated equipment, have a licensed electrician do the power wiring for you. This kit is meant to be educational in nature and can be used with line operated equipment if National Electric Code guidelines are followed. ***