Liquid level automatic control circuit using MC14011 integrated circuit

It uses MC14 011 four NAND gate integrated circuit, which has simple circuit and reliable action. It
is a flood-type water level automatic control circuit. When the water level drops below electrode B, NAND gate D4 outputs low level , the RS flip-flop composed of NAND gates
D1 and D2 is triggered to flip, NAND gate 'D3 outputs high level, transistor VT is turned on, and the relay
KA and contactor KM are closed, and the water pump starts to fill the water tank; when the water level rises to electrode A, pin 1 of the integrated circuit
becomes low level, RS flips, Da outputs low level , VT is cut off, and KA and KM are released. , the water pump stops filling.