A very simple easy to make Frequency counter project. This project is powered with small AT89C2051 microcontroller with LCD. Block Diagram of circuit is shown below. It can support a wide range of frequency input starting from 1Hz to ~16.5Mhz, rest depends on pin characteristics.

Theory of Operation
As we all know frequency of a signal is number of cycles per second. I made use of this logic to calculate frequency of the input signal.

8051 has two timers, Timer 0 is configured for 1 second delay to sample the input signal and Timer 1 is used as a counter to calculate number of cycles in that 1 second. If timer1 overflows then the overflow is counter in another register which is considered as the high byte of Frequency. Input signal is provided at P3.5/T1 which is input for Timer 1 in counter mode. LCD is connected to microcontroller port 1 in 4-bit mode. Currently program is using 2 Line LCD but it can be used for 1 line LCD too.

Program initializes the Timer0 in 16-bit mode with 50mS delay value, a tick value of 20 is loaded to have total delay of 1s (50 x 20 = 1000 mS). Timer 1 is configured in 16-bit counter mode. After a sample of 1 sec, we get the number of cycles hence the frequency of input signal from timer1 registers (TH1:TL1) and high byte of Frequency. So total 3 byte value is then converted to a decimal equivalent represented in hex. This decimal value is then updated to LCD. The whole process repeats again.



For any doubts and suggestions please use forum

Download: Frequency Counter using AT89C2051 and LCD (Assembly)
Tags Frequency Counter using AT89C2051 and LCD8051 projectsFrequency counter project
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ExperimenterUK
Tue Jul 19 2016, 05:59 PM
@mhammad 64 bits is 8 bytes.
Tue Jul 19 2016, 07:56 AM
mhammad kassem
hello! i want to know how to use UART in mikroc , I want to receive 64 bits from another microcontroller and i dont know how to start my code to receive the 64 bits...any help?
ExperimenterUK
Mon Jul 18 2016, 08:32 PM
@meena.. are you still having trouble ?
Sat Jul 16 2016, 10:19 AM
Meena
problem in loading email address while registering.Please help
Sun Jul 10 2016, 02:50 PM
shockwave
could you please provide a sample code that controling LED using bluetooth HC-05 interfacing pic16f877a thank you!
Sun Jul 10 2016, 02:49 PM
shockwave
Help!
ExperimenterUK
Sat Jul 09 2016, 05:25 PM
@Santhana krishnan post in forum to discuss your problem
Thu Jul 07 2016, 09:26 AM
Santhana krishnan
Hi i program atmega 32 it was functiining corectly but now aref pins voltage 2.56 is droped to .85 volts also a ports input viltage also dropped so anologe inpit not funcitonig please help me to find out the problem
Thu Jul 07 2016, 09:24 AM
Santhana krishnan
Hi i program the atmega 32
Thu Jul 07 2016, 09:24 AM
Santhana krishnan
Hi

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ugoo5000 Avatar
Posted By ugoo5000
Sat Jul 30 2016, 07:31 AM
is working noworg 00hmov p1,#11111111bmov p3,#1111...
ugoo5000 Avatar
Posted By ugoo5000
Sat Jul 30 2016, 06:40 AM
when i press a button in p3.0,the counter will st...
ugoo5000 Avatar
Posted By ugoo5000
Sat Jul 30 2016, 06:30 AM
proteus file Attachment ...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Jul 29 2016, 11:34 PM
Your code does not count at all, it produces a one...
ugoo5000 Avatar
Posted By ugoo5000
Fri Jul 29 2016, 07:49 PM
i want the the counter to be counting in secs with...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Jul 29 2016, 07:31 PM
HiYour Proteus file did not upload, be sure to zip...
ugoo5000 Avatar
Posted By ugoo5000
Fri Jul 29 2016, 11:50 AM
below is the proteus file
ugoo5000 Avatar
Posted By ugoo5000
Fri Jul 29 2016, 11:48 AM
i am working on a project to generate a continuous...
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Posted By ExperimenterUK
Sat Jul 23 2016, 07:14 PM
I found this datasheet, it is a type of driver.It ...
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Posted By Piotrekk
Fri Jul 22 2016, 10:12 AM
I found an old box of electronic components in the...