Simple-assembly sensing device

A sensing device comprising:

• a connecting assembly, the connecting assembly comprising a main body and at least two connecting pins engaged in the main body, the main body defining a receiving groove;
• a sensor, the sensor received in the receiving groove and comprising a first electrode layer and a second electrode layer insulated from the first electrode layer, the first electrode layer extending to locate at a same plane with the second electrode layer;
• wherein each of the at least two connecting pins is made of electrically conductive material;
• each of the at least two connecting pins comprises an end portion and an extending portion extending from the end portion;
• the end portion of each of the at least two connecting pins is engaged in the receiving groove, the extending portion of each of the at least two connecting pins extends through the main body to the outside of the main body;
• and
• wherein the first electrode layer is in direct contact with the end portion of one of the at least two connecting pins and the second electrode layer is in direct contact with the end portion of another one of the at least two connecting pins, the sensor is electrically coupled to an external system by the at least two connecting pins;
• wherein the sensor is an ultrasonic sensor, the sensor comprises a signal transmitting element and a signal receiving element stacked on the signal transmitting element the signal transmitting element is configured to produce and transmit ultrasonic waves;
• the signal receiving element is configured to receive ultrasonic waves;
• and the signal transmitting element comprises the first electrode layer, the second electrode layer, and a first piezoelectric material layer between the first electrode layer and the second electrode layer.