measuring time using sensors

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Measuring time using sensors
In this experiment, we measure the time taken by the trolley to move between two points. Traditionally we use the stop watch, but this method introduces human error called reaction time error, which can not be eliminated. Alternatively, sensors connected to processor are used to remove this error completely. when the trolley passes by the first sensor the timer starts and when it passes by the second sensor the timer stops, then the processor calculates and displays the time between the two sensors.

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