Program to read data sent by Python code over serial port using Arduino Board

In this code, python code sends a command "LED_ON" over the serial port which will be ready by the Arduino board and glows a LED for some time and then turns OFF.

Below is the python code to generate "LED_ON" command:

import serial

import time

ser = serial.Serial('COM7', 9600)  # Change COM port as needed

time.sleep(2)  # Wait for Arduino to reset

ser.write(b'LED_ON\n')  # Send command

response = ser.readline().decode().strip()

print("Response from Arduino:", response)

ser.close()

Below is the Arduino code to read data over serial port and glow a LED:

#define PIN 13

void setup() {

    Serial.begin(9600);

    pinMode(PIN,OUTPUT);

}

void loop() {

    if (Serial.available()) {

        String command = Serial.readStringUntil('\n');

        if (command == "LED_ON") {

            Serial.println("LED turned on");

            digitalWrite(PIN,HIGH);

            delay(10000);

            digitalWrite(PIN,LOW);

        }

    }

}