Transmission oil pressure sensor refers to a micro electromechanical system integrating micro sensors, actuators, signal processing and control circuits, interface circuits, communication and electricity generation.Commonly used are silicon piezoresistive and silicon capacitive, both of which are micromechanical-electronic sensors generated on silicon wafers. In general, we use the oil pressure sensor to detect how much oil is left in the car, and convert the detected signal into a signal that we can understand, reminding us how much oil we have, or how far we can go, or even reminding the car that it needs oil.