void setup() {
  Serial.begin(9600);
}

void loop() {
  if (Serial.available() > 0) {
    char data = Serial.read();
    Serial.println(data);

    // Example: Perform some operation with the received data
    // For simplicity, let's just send the data back
    Serial.write(data);
  }
}


import serial
import time

# Replace 'COMx' with the actual COM port where your Arduino is connected
ser = serial.Serial('COMx', 9600, timeout=1)

def send_data(data):
    ser.write(data.encode())
    time.sleep(1)  # Allow time for the Arduino to process

def receive_data():
    if ser.in_waiting > 0:
        data = ser.read(ser.in_waiting).decode('utf-8')
        return data
    return None

# Example usage
send_data('A')  # Send data to Arduino

received_data = receive_data()  # Receive data from Arduino
if received_data:
    print(f"Received from Arduino: {received_data}")

ser.close()