SENSOR BASED ON HALL OF MOTOR SPEED DEVICE DESIGN ABSTRACT In the course of industrial production in life often need to measure speed encounter various occasions. For example, AT the engines motors machine tool spindles and other rotating equipment’s operation and control of the piolt often need frequent time-sharing or continuous measurements show its speed and instantaneous order to accurately measured. The rotate spee measurement system for mon engine is designed with the single chip paper inroduces a puter-based hall sensor speed system,the syetem uses Hall sensor pulse signal collected through the timer counting algorithm programs,will speed the results of real-time disply. The result of the experiment shows that the measurement system is able to satisfy the requirement of the engine rotate speed measurement. Key words:Single-chip;Motor Speed System; Hall sensor; Timing