ABSTRACT
With industrial production and the rapid development of science and technology, transport applications in the expanding variety and number are also growing. China is a big country bike, with the improvement of living standards, the role of bicycles in addition to means of transport, people gradually began to be used for fitness and leisure. In order to better understand the cycle in the process of training effect, a bike-speed measurements have become a more critical issue. General bike speed are measured by detecting the speed to achieve.
The content was based on the deep understanding of the current domestic and international machinery for the speed measurement technology. Take the bicycle to the target,I try to build the shaft rotational speed measurements to measure the speed of the bicycle equipment.
Firstly, the content introduced mechanical speed measurements for the most commonly used measurement methods and use of sensors. What’s more? It made a detailed analysis of this topic of the principles, methods and the use of function..Which has been selected for research methods and sensors. On the hardware design, respectively, it was analysis of a AT89S52 microcontroller as the core of the system by building various components, including level translation, speed measurement,results showed that, and so on. Meanwhile it was analyzed the various parts of the principle of the composition involved and the characteristics of the chip. Key words: Measurement of the rotational speed ,The pulse counts the frequency ,
Anti-disturbance