Design of motor speed measurement system based on microcontroller (defense version) complete graduation thesis with pictures and source program

In engineering practice, we often encounter various situations where rotation speed needs to be measured. There are two methods for measuring rotation speed: analog and digital. The analog type uses a tachometer generator as the detection component, and the signal obtained is an analog quantity. The digital type usually uses photoelectric encoders, Hall elements, etc. as detection elements, and the obtained signal is a pulse signal. With the widespread application of microcomputers, especially the emergence of high-performance and cost-effective microcontrollers, digital measurement methods with microcontrollers as the core are commonly used for rotational speed measurement.
This article is an intelligent speed measuring instrument controlled by AT89C51 microcontroller. During the operation of the motor, it needs to be monitored, and the rotation speed is an essential parameter. This system measures the motor speed and can communicate with the PC to display the motor speed and observe the basic conditions of the motor operation.
This design mainly uses AT89C51 as the control core, which is composed of Hall sensor, LED digital picture tube, HIN232CPE level conversion, and RS232. The measurement speed system of the microcontroller and the serial communication between the PC and the microcontroller are introduced in detail. Give full play to the performance of the microcontroller. The focus of this article is to measure the speed and display it on the 5-digit LED digital tube.
Its advantages include simple hardware circuit, complete software functions, fast measurement speed, high accuracy, reliable control system, and high cost performance.