Principle circuit of water level automatic controller

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

Photocoupler

As shown in the figure, A, B, and C are water tower water level detecting electrodes, D and E are water well water level detecting electrodes, J1 is a small relay for control, J2 is an AC contactor, and M is a pumping motor. When the water level in the water tower reaches point A, the conduction between A and B causes the potential of the 6th pin of 555 to rise to 8V or higher, the 3rd leg of 555 outputs a low level, J1 is sucked, and the normally closed contact J1-1 cuts off the power of J2. The motor M loses power and stops sending water. When the water level in the water tower is lower than the A point, B and C are still conducting, and the potential at point A falls below 6V, maintaining the original state. When the water level in the water tower is lower than B, the high resistance between B and C is high, and the potential of the second foot of 555 is close to zero. If the water level in the well is above D, the conduction between D and E is 555. When the potential of the 4th pin is above 1V, the 555 outputs a high level, J1 is released, J2 is pulled in, and M is electrically activated to send water to the water tower: If the potential in the well is below the D point, the water well is exhausted, D, E Open circuit, 555 4th foot is grounded by W1, in reset state, output low level, J1 is sucked, J2 is released, M is lost, and water is stopped.