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
Thu Nov 20 2014, 06:00 PM
@Mehboob.. I don't think you can do that.
Sat Nov 15 2014, 06:41 AM
Mehboob
Pls can you send me code in c of PWM generation using UART/serial port in 8051.
Fri Nov 14 2014, 02:51 PM
mohammad aqil
NEED A BOOK ON MICROPROCESSOR AND INTERFACING BY D.V.HALL. RIGHT NOW, I SHALL BE VERY THANK FULL TO U....
Thu Nov 13 2014, 02:15 PM
m
please code hex project avr blood pressure monitor
Thu Nov 13 2014, 05:56 AM
Lambo
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ExperimenterUK
Wed Nov 12 2014, 12:56 AM
@tmtm000.. have you been able to join ?
ExperimenterUK
Wed Nov 12 2014, 12:54 AM
@Alice..become a member,then send a PM to ajay_bhargav the site owner.
Tue Nov 11 2014, 03:58 AM
Abhishek Bansal
Thanks a lot for your informative tutorials!
Mon Nov 10 2014, 09:03 AM
Alice
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Sat Nov 08 2014, 11:58 AM
Mohamed_123sd
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Max.otto Avatar
Posted By Max.otto
Mon Nov 24 2014, 09:05 AM
@ExperimenterUKOnly 1 question. I wrote in program...
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Posted By ExperimenterUK
Sat Nov 22 2014, 06:15 AM
@ExperimenterUKI make small table to observe Outpu...
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Fri Nov 21 2014, 02:31 PM
@ExperimeterUKForgot my last question.As i told be...
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Posted By Max.otto
Fri Nov 21 2014, 02:05 PM
@ExperimenterUKI make small table to observe Outpu...
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Posted By Max.otto
Fri Nov 21 2014, 01:12 PM
@ExperimenterUKThank u. I do it. Ohne Period it's ...
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Posted By ExperimenterUK
Thu Nov 20 2014, 05:56 PM
You set the on/off times here as 47%float PWMcom...
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Posted By vijay.parmar1992
Thu Nov 20 2014, 04:06 AM
Right now i am studying Bootloader.I want to writ...
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Posted By Max.otto
Wed Nov 19 2014, 03:11 PM
How can i get PWM on-off time..?pls check the atta...
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Posted By Max.otto
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I am using PSoC 5LP.pls check the attached design ...
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Posted By ankitbajaj01
Wed Nov 19 2014, 01:49 PM
Thanks for the prompt response, I will try it out ...