Published October 25, 2024

Frequency Meter Based on Arduino UNO

Introducing our Arduino UNO-based Frequency Meter: a compact, accurate tool for measuring signals

BeginnerFull instructions provided206

Things used in this project

Hardware components

Arduino UNO

Adafruit Standard LCD - 16x2 White on Blue

Software apps and online services

PCBX Online Simulation

Story

Introduction

This project can measure the interval between switch presses to calculate the frequency and display it on the LCD screen.

Description

This project simulates a frequency meter using an Arduino UNO board. The circuit includes an LCD display and a switch. The LCD display's RS, EN, D4, D5, D6, and D7 pins are connected to Arduino UNO digital pins 12, 11, 7, 6, 5, and 4, respectively. A switch is connected to analog pin A0 of the Arduino UNO.

When the switch detects a high signal, it triggers the Arduino UNO to start counting the pulses. The frequency is calculated by dividing 1000 by the average duration of the pulses. The result is displayed on the LCD, allowing users to read the frequency of the external signal source. This frequency meter can be used in various applications where pulse frequency measurement is required, such as in electronics testing, signal analysis, or educational demonstrations.

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Code

Arduino UNO-based Frequency Meter

#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 7, 6, 5, 4);
const int signalPin = A0;

unsigned long pulseStartTime = 0;
unsigned long pulseCount = 0;
float frequency = 0.0;

void setup() {
  pinMode(signalPin, INPUT);
  
  lcd.begin(16, 2);
  lcd.print("Frequency(Hz):");
}

void loop() {
  if (digitalRead(signalPin) == HIGH) {
    if (pulseStartTime == 0) {
      pulseStartTime = millis();
    }
  } else {
    if (pulseStartTime != 0) {
      pulseCount++;
      unsigned long pulseDuration = millis() - pulseStartTime;
      frequency = 1000.0 / (pulseDuration / (pulseCount - 1));
      pulseStartTime = 0;
    }
  }

  lcd.setCursor(9, 1);
  lcd.print(frequency, 4); 
  
  delay(100);
}