Water pump single line communication device

The invention belongs to the technical field of brushless direct current water pump communication, and particularly relates to a water pump single line communication device. The water pump single linecommunication device comprises a micro-control unit, a communication port and a signal modulation circuit of a direct current brushless water pump, wherein the communication port is further connectedto an application system outside the direct current brushless water pump; the signal modulation circuit comprises a first communication end, a second communication end, a third communication end anda level switch circuit. According to the water pump single line communication device, on one hand, a feedback signal is output to the application system, so that a signal feedback function is realized, on the other hand, the level switch circuit is arranged to enable the micro-control unit to capture a speed regulation signal when the feedback signal is at a high electrical level so as to regulatethe speed of the direct cur