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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rawat742
Fri Aug 18 2017, 11:37 AM
hi @ angel patel i will attach a file i hope it will be helpfull for you
ExperimenterUK
Mon Aug 14 2017, 09:57 PM
@ angel patel... just log in and post your problem
Mon Aug 14 2017, 01:45 PM
angel patel
hey any one help to make the led scrolling display
desuza6
Sat Jul 29 2017, 07:09 AM
I see the code for step motor h l 298 to rotate 45 degree, but all delay time, if I want to input sensor to h the pulses to stepmotor
rammichael
Thu Jul 27 2017, 12:05 PM
okay fine
ExperimenterUK
Wed Jul 26 2017, 07:51 PM
Please post questions in the forum, the chat box is for chat
msd007
Wed Jul 26 2017, 11:27 AM
i need code if any one have aduc706 interfacing lcd 16*2
msd007
Wed Jul 26 2017, 11:26 AM
pl help me how to write code of interfacing ADuc7026 controlleo lcd pl any one help me hoe to initializend configure the direction
rammichael
Wed Jul 26 2017, 06:04 AM
can you explain what is timer and how to use their modes ...
rammichael
Wed Jul 26 2017, 06:03 AM
ExperimenterUk thank you for your quick reply okay

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hello everyone i write a simple program using c la...
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else x+=0x46; //print as ascill 0x41 to 0x46 A-F ...
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Dear Sir, I have a another program in which I am a...
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LCD SCROLLING MESSAGE PROGRAM CODE AND SIMULATION...
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Dear Sir , I am not able to increased value by pre...
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Dear Sir, as per your attachment I w...
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Try this. Attachment ...
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The original 8051 is a primitive device.Over the ...