| dc.description.abstract | A digital tachometer is a digital device that measures and indicates the speed of a
rotating object. A rotating object may be a bike tire, a car tire or a ceiling fan, or any
other motor, and so on. A digital tachometer circuit comprises LCD or LED read out
and a memory for storage. Digital tachometers are more common these days and they
provide numerical readings instead of dials and needles. This device is an embedded
system; it is built using a microcontroller, an alpha-numeric LCD module and an
infrared system to detect the rotation of the fan whose speed is being measured. The
infrared system generates the pulses from the fan which will be sent to the
microcontroller and the pulses will be counted; the reading is displayed on the liquid
crystal display (LCD module) in revolution per minute (RPM). It is a low cost digital
tachometer that can display exact speed reading based on how fast an object is
rotating.it adopts the Use infrared transmitter and receiver as the technology behind
the speed detection. It can be used in various applications. It can measure the speed of
rotating objects (examples of rotating objects include: a bike tire, a car tire, a ceiling
fan, or any other motor) in the most accurate form possible. In automotive, it is used
as a gauge showing the speed (RPM) of the engine shaft that is driving the
transmission, usually in thousands of rotations per minute. | en_US |
