Abstract
The speed sensor is an important support for the development of modern industrial automation. It plays a great part in automobiles, machinery manufacturing, and aerospace, and is widely used in CNC machine tools, cutting laser machines, industrial transmission, and other mechanical equipment. In this paper, a sensor is designed, which uses the signal generated by the body’s rotation as a sine wave signal to transmit frequency information. The sinusoidal signal is transmitted to the signal processing circuit, and two voltage dividers are used to reduce the signal amplitude to the applied voltage of the MCU below 5V. After processing the circuit, the sinusoidal signal can be converted into the square wave signal with the same frequency. The square wave signal is transmitted to the microcontroller to read the square wave’s pulse frequency, and the body’s rotational speed can be output after the formula is calculated in the program read by the microcontroller in advance.
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