Cipad 31: Compteur Arduino de fréquence avec afficheur lcd 16x2

Introduction

In this tutorial, we will learn how to create a frequency counter using an Arduino and a 16x2 LCD display. This project is part of a beginner's series on Arduino programming and is a practical way to understand how to measure frequency and display it visually.

Step 1: Gather Your Components

Before starting the project, ensure you have the following components:

• Arduino board (e.g., Arduino Uno)
• 16x2 LCD display
• Breadboard
• Jumper wires
• Resistors (typically 220Ω and 10kΩ)
• Capacitor (optional, depending on your circuit)

Practical Tips

• Make sure your Arduino IDE is installed and up to date.
• Verify that your components are functioning properly before assembly.

Step 2: Set Up the Circuit

Follow these steps to assemble the circuit:

1. Connect the LCD display to the Arduino:

   • VSS to GND
   • VDD to 5V
   • V0 to the middle pin of a potentiometer (connect the other two pins to VDD and GND)
   • RS to pin 12 on the Arduino
   • RW to GND
   • E to pin 11 on the Arduino
   • D4 to pin 5 on the Arduino
   • D5 to pin 4 on the Arduino
   • D6 to pin 3 on the Arduino
   • D7 to pin 2 on the Arduino

2. Connect the frequency input signal to a digital pin (e.g., pin 7).

3. If additional components like resistors or capacitors are needed, integrate them into the circuit according to the schematic provided in the video or project links.

Common Pitfalls

• Double-check all connections to avoid short circuits.
• Ensure the LCD is correctly powered; otherwise, it may not display anything.

Step 3: Write the Arduino Code

Now, you will need to upload the appropriate code to your Arduino. Here’s a basic example:

#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

volatile int frequencyCount = 0;

void setup() {
    lcd.begin(16, 2);
    pinMode(7, INPUT);
    attachInterrupt(digitalPinToInterrupt(7), countFrequency, RISING);
}

void loop() {
    lcd.setCursor(0, 0);
    lcd.print("Frequency:");
    lcd.setCursor(0, 1);
    lcd.print(frequencyCount);
    delay(1000); // Update every second
}

void countFrequency() {
    frequencyCount++;
}

Explanation of the Code

• The LiquidCrystal library is used to control the LCD.
• An interrupt is set up to count the frequency each time the signal on pin 7 rises.
• The frequency count is displayed on the LCD, updating every second.

Step 4: Upload the Code to Arduino

1. Connect your Arduino to your computer using a USB cable.
2. Open the Arduino IDE and paste the code above into a new sketch.
3. Select the correct board and port from the 'Tools' menu.
4. Click the upload button to transfer the code to your Arduino.

Practical Tips

• Use the serial monitor to debug any issues that arise during the upload or execution of the code.

Conclusion

In this tutorial, we created a frequency counter using an Arduino and a 16x2 LCD display. You learned how to gather components, set up the circuit, and write the necessary code. This project serves as a foundation for further exploration into Arduino programming and electronics.

Next Steps

• Experiment with different input frequencies to test your frequency counter.
• Modify the code to display additional information or enhance functionality, such as calculating the period or average frequency.