How to communicate between a python script and arduino

Question

There is a way to communicate to arduino r4 trought a python script?Thanks

Saurabh Prajapati · Answer

| Component | Description | | ---------------- | --------------------------------------------------------- | | Arduino Board | Any (Uno, Nano, Mega, etc.) | | Connection | USB cable | | Python Package | `pyserial` → Install via: `pip install pyserial` | | Baud Rate | 9600 (must be the same on both sides) | | Port (Windows) | `COM3`, `COM4`, etc. (Check Device Manager) | | Port (Linux/Mac) | `/dev/ttyUSB0`, `/dev/ttyACM0`, etc. (Check via terminal) | Ardiono Code:- void setup() { Serial.begin(9600); // Start Serial Communication } void loop() { if (Serial.available()) { String data = Serial.readStringUntil('
'); // Read incoming data from Python Serial.print("Received: "); Serial.println(data); // Echo back to Python } delay(100); // Optional: avoid buffer overload } Python Code:- import serial import time # Create Serial connection (update 'COM3' if needed) arduino = serial.Serial(port='COM3', baudrate=9600, timeout=1) time.sleep(2) # Wait for Arduino to initialize def send_to_arduino(data): arduino.write((data + '
').encode()) # Send string with newline time.sleep(0.1) if arduino.in_waiting: response = arduino.readline().decode().strip() print("From Arduino:", response) # Example usage send_to_arduino("Hello Arduino") send_to_arduino("123") | Python Sends | Arduino Responds | | --------------- | ------------------------- | | `Hello Arduino` | `Received: Hello Arduino` | | `123` | `Received: 123` |

How to communicate between a python script and arduino

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