Rotational speed measurement is important in all areas of engineering. Rotating machines are
everywhere from airplane engines, disc readers in computers, cassette players to large scale
motors and generators in industries. For proper and efficient operation, speeds of these machines
need to be accurately measured. Rotational speed measurement has been one of the many
beneficiaries of advancements in microprocessor and semiconductor technology.
This report details stages involved in designing and implementing a cheap non-contact
microprocessor based speed measurement system based on the PIC 16F690 from Microchip.
Readings of rotations per minute were displayed on a 16x2 LCD based on Hitachi’s HD 44780
LCD Controller/Driver.
Computer simulation experiments performed on Proteus software version 7.8 from Labcenter
have been used to demonstrate the accuracy and stability of the designed device based on the
proposed algorithm. The device was then implemented and its performance compared against the
DT-2234A+ ,an industrial standard tachometer.
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