Arduino Project

Finger Count 1.0

Course Introduction

This project controls the LED matrix on an Arduino Uno R4 WiFi board based on finger count data received from a Python script. The script detects the number of fingers shown to a camera and sends this data to the Arduino via serial communication(USB). The Arduino then displays the corresponding number on the LED matrix.

Note

If this is your first time working with an Arduino project, we recommend downloading and reviewing the basic materials first.

1.1 Install Arduino IDE(Important)
1.2 Introduction of Arduino IDE

Required Components

In this project, we need the following components:

SN

COMPONENT INTRODUCTION

QUANTITY

PURCHASE LINK

1

Arduino UNO R4 WIFI

1

BUY

2

USB Type-C cable

1

×

Operating Steps

Copy the following code into Arduino IDE.
Use the Arduino Library Manager and search for ArduinoGraphic and Arduino_LED_Matrix install libraries.
Select the board(Arduino UNO R4 WIFI) and then clicking the Upload button.
Then use the Python code FingerCountSender. You can click here FingerCountSender.zip to download it.
Update the Python script to use the correct serial port(COMx).
Then run the python code to open the camera window.


#include "ArduinoGraphics.h"
#include "Arduino_LED_Matrix.h"

ArduinoLEDMatrix matrix;

char lastChar = '\0';  // Variable to store the last read character

void setup() {
  // Start serial communication
  Serial.begin(115200);
  Serial.setTimeout(1);

  matrix.begin();

  delay(500);
}

void loop() {
  // Check if data is available on the serial port
  if (Serial.available() > 0) {
    // Read one character from serial input
    char c = Serial.read();

    // Check if the new character is different from the last character
    if (c != lastChar) {
      // Update the last character
      lastChar = c;

      // Clear the matrix before displaying the new character
      matrix.clear();

      matrix.beginDraw();

      matrix.stroke(0xFFFFFFFF);  // Set stroke color
      matrix.textFont(Font_5x7);  // Set font
      matrix.beginText(4, 1, 0xFFFFFF);  // Position and color for text
      matrix.print(c);  // Display the character
      matrix.endText();

      matrix.endDraw();
    }

    // Delay to prevent too frequent updates (optional)
    delay(10);
  }
}
}