News
- ajay_bhargav
- Wed Oct 28 2009, 02:57 am
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
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)
Submit comment
Downloads
- Automatic Railway Gate Control by: Sharanjit Singh in: 8051 Projects
Tue Oct 15 2019, 12:47 pm - Yet Another DTMF Controlled Robot by: Er. Sharanjit Singh in: 8051 Projects
Tue May 07 2019, 02:45 pm - Simple 3 Digit Temperature Meter by: Rakesh Suthar in: PIC Projects
Sat Jul 05 2014, 11:45 am - Electronic Voting machine with Managed Control Unit (Project Report Included) by: Shivani, Geetika Gupta, Vibhore Aggarwal, Megha Singh in: 8051 Projects
Sat May 17 2014, 07:46 pm - LED Scrolling message Display using 8051 by: Pratik Suthar in: 8051 Projects
Thu May 08 2014, 04:28 pm
Comments
- Pure Sine Wave Inverter Using Atmel 89S2051 by: Anthonyvab
Wed Apr 17 2024, 08:51 am - Pure Sine Wave Inverter Using Atmel 89S2051 by: Jerrydauck
Fri Mar 01 2024, 08:51 am - Pure Sine Wave Inverter Using Atmel 89S2051 by: DennisVatry
Thu Feb 22 2024, 10:04 pm - Pure Sine Wave Inverter Using Atmel 89S2051 by: DonaldPaids
Thu Feb 22 2024, 03:45 pm - Pure Sine Wave Inverter Using Atmel 89S2051 by: Victornwh
Mon Feb 19 2024, 12:01 pm
Richardgar
Sat Apr 20 2024, 11:05 am
AntoniaRoons
Fri Apr 19 2024, 09:59 pm
carpinteyrowrl
Fri Apr 19 2024, 02:51 pm
DonaldJAX
Fri Apr 19 2024, 01:08 pm
Lewisuhakeply
Thu Apr 18 2024, 06:00 pm
Darrellciz
Thu Apr 18 2024, 11:07 am
Charlessber
Thu Apr 18 2024, 09:29 am
BartonSem
Thu Apr 18 2024, 04:56 am
Trending Topics
PIC 12C675 frequency conversion automation home automation using gsm modem USB in Nutshell ready to rock interfacing with C++ An Introduction to Programming the microchip PIC delay using registers IIC tutorial PSU with overvoltage protection block diagram humanoid robot electronics tutorial library speech synthesis proteus model Audeo power supply Nokia 3310 LCD PCB layout I2C EEPROM internal addressing