Ultrasonic Sensor - LF91A

The ultrasonic sensor is mainly composed of a transmitting section, a receiving section, a control section, and a power supply section.
Among them, the transmitting section consists of a transmitter and a transducer. The transducer can convert the energy generated by the vibration of the piezoelectric chip under voltage excitation into ultrasonic waves, and the transmitter emits the generated ultrasonic waves.
The receiving section consists of a transducer and an amplification circuit. The transducer receives the reflected ultrasonic waves. Since mechanical vibrations are generated when receiving ultrasonic waves, the transducer can convert mechanical energy into electrical energy, and the amplification circuit amplifies the generated electrical signal.
The control section controls the entire operating system. First, it controls the transmitter to emit ultrasonic waves, then controls the receiver to determine whether the received waves are those emitted by itself, and finally identifies the strength of the received ultrasonic waves.
The power supply section is the power device for the entire system. Thus, under the action of the power supply and the control section, the transmitter and receiver cooperate to complete the sensor's required functions.