关键词：测速 定时 计数 译码 显示
ABSTRACT
A device used for electron measure velocity instrument is my program of designing at the end of my college life. Belong to not the contact type of measure velocity instrument. About this circuit, there are steady voltage electrical source power supply, rotate speed semaphore signal check hend (hall switch),time control,impulse semaphore singal count,encoder,figures tube manifestation and LED diode of give out light ,and so on. While the shaft of be measured turning to move a turn,the hall switch will give out a measure single .When the circuit input what is the turning pulse single of shaft,the machine is used to be settled the hour will start to settle the hour according to the hour which of be settled, the machine of count will start to count ,then translate the code and drive through the circuit of translate the code,end,show in the figures tube .The reset of the electron measure velocity instrument isn’t auto,so that it can have some functions like precision and credibility,etc.The most importance ,the break of period is so short.
