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.
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Theory of Operation
Our current lineup of PIC® and AVR® MCUs is the pinnacle of innovation in the 8-bit embedded space and incorpo-rates the latest technologies to enhance system performance while reducing power consumption and development time. The PIC and AVR MCU brands represent the two dominant architectures in the embedded design universe.
As we all know frequency of a signal is number of cycle 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.
Files:
1. FreqCounter.asm - Main program
2. FreqCounter.hex - Hex file
3. frequency_counter.png - Block Diagram
4. Schematic.pdf - circuit
For any doubts and suggestions please use forum
Use the Download button below to download this project.
Tags Frequency Counter using AT89C2051 and LCDFrequency Counter using 805140.92755-87.30875
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