This document describes a frequency meter project that uses an 8051 microcontroller to determine and display the frequency of an input power source. It works by using a counter to accumulate the number of events within a time period, then displaying the value on an LCD screen. The circuit includes an 8051 microcontroller, LCD display, cathode ray oscilloscope to view the waveform, and a variable power supply. Frequency counters are commonly used to directly measure oscillator and transmitter frequencies in applications like laboratories, function generators, and as counters.

1. BORAD PRAFUL V.(140213111002)
GILATAR GHANSHYAM T .(140213111006)
GOHEL JAYDEV K .(140213111007)

2. INTRODUCTION
 The object of this project is to determine and display the
frequency of the input power. This is done by using 8051
microcontroller.
 Most frequency counters work by using a [counter] which
accumulates the number of events occurring within a specific
period of time.
 After a preset period (1 second, for example), the value in the
counter is transferred to a display and the counter is reset to zero.
 If the event being measured repeats itself with sufficient stability
and the frequency is considerably lower than that of the clock
oscillator being used, the resolution of the measurement can be
greatly improved by measuring the time required for an entire
number of cycles, rather than counting the number of entire
cycles observed for a pre-set duration.

3. BLOCK DIAGRAM

4. CIRCUIT DIAGRAM

5. WORKING
 The object of this project is to determine and display the frequency of the input power. This is
done by using 8051 microcontroller. The circuit of our designed frequency meter includes
8051 microcontroller, Liquid Crystal Display(LCD),Cathode Ray Oscilloscope(CRO) and
variable power supply unit.
 The CRO is used to display the frequency waveform of the given input power. Based on the
source code given to the 8051 microcontroller it detects the frequency value and displays that
value with the help of the LCD employed. Depending on the power supply the value of the
frequency on the LCD changes.
 Most frequency counters work by using a [counter] which accumulates the number of events
occurring within a specific period of time. After a preset period (1 second, for example), the
value in the counter is transferred to a display and the counter is reset to zero. If the event
being measured repeats itself with sufficient stability and the frequency is considerably lower
than that of the clock oscillator being used, the resolution of the measurement can be greatly
improved by measuring the time required for an entire number of cycles, rather than counting
the number of entire cycles observed for a pre-set duration.
 Frequency counters are commonly used in laboratories, factories, and field environments to
provide direct frequency measurements of various devices. The most common applications for
frequency counters are measurement and characterization of oscillator and transmitter
frequencies.

6. APPLICATION
 IN CRO
 IN FUNCTION GENERATOR
 IN LABORATRIES
 USED AS A COUNTER