Frequency counter Arduino UNO

Description of the Arduino Frequency Measurement Code

This Arduino code utilizes a Liquid Crystal Display (LCD) to measure and display the frequency of a digital signal connected to an input pin. The LiquidCrystal library is used to manage the LCD, which is initialized with specific pins for communication. The program counts the number of pulses detected on the signalPin (A0) and calculates the frequency based on the timing of these pulses.

In the setup() function, the signal pin is set as an input to detect incoming pulses, and the LCD is initialized to show a static label indicating that it will display frequency measurements. The loop() function checks the state of the signal pin: when it detects a HIGH signal, it records the start time of the pulse. Once the signal goes LOW, the code calculates the duration of the pulse, increments the pulse count, and computes the frequency in Hertz. The calculated frequency is then displayed on the second row of the LCD.

This project is ideal for electronics enthusiasts interested in learning about frequency measurement, LCD interfacing, and Arduino programming. It provides a practical application of pulse counting and timing, making it a valuable hands-on project for beginners.

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SCHEMATIC:

CODE:

#include <LiquidCrystal.h>

// Initialize the LCD object with the Arduino pins used for communication
LiquidCrystal lcd(12, 11, 7, 6, 5, 4);

// Define the input pin for the signal
const int signalPin = A0;

// Variables to track pulse timing, count, and calculated frequency
unsigned long pulseStartTime = 0; // Stores the start time of the current pulse
unsigned long pulseCount = 0; // Counts the number of pulses detected
float frequency = 0.0; // Stores the calculated frequency in Hz

void setup() {
// Configure the signal pin as an input to detect pulses
pinMode(signalPin, INPUT);

// Initialize the LCD with 16 columns and 2 rows
lcd.begin(16, 2);

// Display a static label on the LCD to indicate the frequency
lcd.print("Frequency(Hz):");
}

void loop() {
// Check if the signal pin is HIGH (start of a pulse)
if (digitalRead(signalPin) == HIGH) {
// If this is the start of a new pulse, record the time
if (pulseStartTime == 0) {
pulseStartTime = millis();
}
} else {
// Check if the pulse has ended
if (pulseStartTime != 0) {
// Increment the pulse count
pulseCount++;

  // Calculate the duration of the pulse (in milliseconds)
  unsigned long pulseDuration = millis() - pulseStartTime;
  // Calculate the frequency in Hz
  // Frequency = 1000 ms / average pulse duration
  frequency = 1000.0 / (pulseDuration / (pulseCount - 1));
  // Reset the pulse start time for the next pulse
  pulseStartTime = 0;
}

}

// Move the cursor to the second row, column 9 on the LCD
lcd.setCursor(9, 1);

// Display the calculated frequency with 4 decimal places
lcd.print(frequency, 4);

// Add a short delay to stabilize the display updates
delay(100); // Changed to 100 ms for readability }

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