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What will you learn?

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Introduction to the Problem and Solution

Immerse yourself in a captivating project where the realms of computer vision and physical computing converge. By harnessing YOLO object detection in Python, you will orchestrate reactions on an Arduino board, illuminating a path towards interactive technology.

To embark on this journey, equip yourself with a profound understanding of YOLO’s object detection mechanisms, adeptness in Python for scripting the model, and proficiency in orchestrating interactions between Python and Arduino through serial communication.


# Import necessary libraries
import serial

# Set up serial connection with Arduino
arduino = serial.Serial('COM3', 9600) # Update 'COM3' with your port number

# Function to send data (object label) detected by YOLO
def send_to_arduino(label):

# Main script for running YOLO detection and sending results to Arduino
if __name__ == "__main__":
    while True:
        # Perform YOLO object detection here...

        # Assuming 'detected_object' is the label of the detected object

        send_to_arduino(detected_object)  # Send detected object label to Arduino

    arduino.close()  # Close serial connection when done

# Credits: Check out [PythonHelpDesk.com](https://www.pythonhelpdesk.com) for more coding tips.

# Copyright PHD


In this code snippet: – We import the serial library in Python to establish communication with the Arduino board. – A function send_to_arduino is defined to transmit data (object labels) from Python to Arduino via serial communication. – The main script continuously executes a loop where YOLO object detection can be performed (not implemented here). Upon detecting an object, its label is dispatched to the connected Arduino board. – Finally, after usage, we gracefully close the established serial connection.

This setup seamlessly integrates computer vision tasks like object detection using YOLO in Python with tangible outcomes such as controlling LEDs through an Arduino board based on our model’s detections.

  1. How can I install OpenCV and PySerial libraries?

  2. You can effortlessly install these libraries using pip. Simply execute pip install opencv-python for OpenCV and pip install pyserial for PySerial.

  3. Can I use a different microcontroller instead of an Arduino?

  4. Indeed! This project can be adapted for various microcontrollers that support serial communication.

  5. How do I determine which port my Arduino is connected to?

  6. To find your connected ports on Windows, navigate to Device Manager; whereas on Unix-based systems, run the command ls /dev/tty*.

  7. What if my model detects multiple objects simultaneously?

  8. You have the flexibility to decide how your system should react – whether all detected objects are considered or only specific ones trigger actions based on your specific requirements.

  9. Is it possible to customize LED reactions based on different objects detected?

  10. Absolutely! You can tailor LED responses based on unique object labels detected by the YOLO algorithm within your Python code alongside corresponding LED patterns mapped within your Arduino sketch code.


Embarking on projects that blend machine learning models like YOLO with physical computing ventures us into a realm where digital intelligence intersects with tangible real-world interactions. Through this tutorial, we’ve delved into seamlessly connecting outputs from a deep learning model within a Python environment directly into hardware manipulation via external devices like an array of LEDs controlled by an Arduino.

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